Frequently Asked QuestionsAbout Frequency Products
What is the minimum information needed to order a crystal
2
We need the answers to the following
questions
Frequency in kHz or MHz ndash preferably to six decimal places anything after the significant digits will be taken as zero unless indicated
Holder style
Adjustment (sometimes called Calibration) tolerance (in ppm)
Temperature stability over operating temperature range (in ppm)
Operating temperature range in degrees centigrade
Load capacitance either parallel resonant in pF or series resonant (SR)
What is load capacitance
3
This is the capacitance of the oscillator
circuit as presented to the quartz crystal
resonator
The most common type of crystal is
parallel resonant where the crystal
operates at a frequency above its series
resonant frequency (point of lowest
impedance)
What is the Piezoelectric effect
4
Quartz crystals depend upon the
piezoelectric effect in order to function
Itrsquos based upon a quartz resonator
coated with an electrode on both faces
then mounted in a sealed holder
Application of an external AC voltage to
these electrodes gives rise to a
mechanical vibration
Will the crystal operate outside its specified temperature range
5
Yes
If for example a crystal is specified over
ndash10 to +60degC it will perform without any
issue over ndash40 to +85degC but it is possible
that it will fall outside its specified stability
This may not matter if the application
needs just a stable frequency rather than
an accurate frequency
Why is it important to specify the operating temperature range
6
See slide 5
Also if the temperature goes significantly
outside the specified temperature range it
is possible that damage to the crystal may
be caused
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
What is the minimum information needed to order a crystal
2
We need the answers to the following
questions
Frequency in kHz or MHz ndash preferably to six decimal places anything after the significant digits will be taken as zero unless indicated
Holder style
Adjustment (sometimes called Calibration) tolerance (in ppm)
Temperature stability over operating temperature range (in ppm)
Operating temperature range in degrees centigrade
Load capacitance either parallel resonant in pF or series resonant (SR)
What is load capacitance
3
This is the capacitance of the oscillator
circuit as presented to the quartz crystal
resonator
The most common type of crystal is
parallel resonant where the crystal
operates at a frequency above its series
resonant frequency (point of lowest
impedance)
What is the Piezoelectric effect
4
Quartz crystals depend upon the
piezoelectric effect in order to function
Itrsquos based upon a quartz resonator
coated with an electrode on both faces
then mounted in a sealed holder
Application of an external AC voltage to
these electrodes gives rise to a
mechanical vibration
Will the crystal operate outside its specified temperature range
5
Yes
If for example a crystal is specified over
ndash10 to +60degC it will perform without any
issue over ndash40 to +85degC but it is possible
that it will fall outside its specified stability
This may not matter if the application
needs just a stable frequency rather than
an accurate frequency
Why is it important to specify the operating temperature range
6
See slide 5
Also if the temperature goes significantly
outside the specified temperature range it
is possible that damage to the crystal may
be caused
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
What is load capacitance
3
This is the capacitance of the oscillator
circuit as presented to the quartz crystal
resonator
The most common type of crystal is
parallel resonant where the crystal
operates at a frequency above its series
resonant frequency (point of lowest
impedance)
What is the Piezoelectric effect
4
Quartz crystals depend upon the
piezoelectric effect in order to function
Itrsquos based upon a quartz resonator
coated with an electrode on both faces
then mounted in a sealed holder
Application of an external AC voltage to
these electrodes gives rise to a
mechanical vibration
Will the crystal operate outside its specified temperature range
5
Yes
If for example a crystal is specified over
ndash10 to +60degC it will perform without any
issue over ndash40 to +85degC but it is possible
that it will fall outside its specified stability
This may not matter if the application
needs just a stable frequency rather than
an accurate frequency
Why is it important to specify the operating temperature range
6
See slide 5
Also if the temperature goes significantly
outside the specified temperature range it
is possible that damage to the crystal may
be caused
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
What is the Piezoelectric effect
4
Quartz crystals depend upon the
piezoelectric effect in order to function
Itrsquos based upon a quartz resonator
coated with an electrode on both faces
then mounted in a sealed holder
Application of an external AC voltage to
these electrodes gives rise to a
mechanical vibration
Will the crystal operate outside its specified temperature range
5
Yes
If for example a crystal is specified over
ndash10 to +60degC it will perform without any
issue over ndash40 to +85degC but it is possible
that it will fall outside its specified stability
This may not matter if the application
needs just a stable frequency rather than
an accurate frequency
Why is it important to specify the operating temperature range
6
See slide 5
Also if the temperature goes significantly
outside the specified temperature range it
is possible that damage to the crystal may
be caused
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Will the crystal operate outside its specified temperature range
5
Yes
If for example a crystal is specified over
ndash10 to +60degC it will perform without any
issue over ndash40 to +85degC but it is possible
that it will fall outside its specified stability
This may not matter if the application
needs just a stable frequency rather than
an accurate frequency
Why is it important to specify the operating temperature range
6
See slide 5
Also if the temperature goes significantly
outside the specified temperature range it
is possible that damage to the crystal may
be caused
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Why is it important to specify the operating temperature range
6
See slide 5
Also if the temperature goes significantly
outside the specified temperature range it
is possible that damage to the crystal may
be caused
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Explain the differences between fundamental crystals and overtone crystals
7
A fundamental crystal oscillates at the
frequency determined by the dimensions
of the quartz blank
Overtone crystals operate at either the
3rd 5th or 7th multiple of the
fundamental
The crystal is specially designed to operate
in these modes
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Where do I find IQD product specifications
8
Specifications can be found on our website
wwwiqdfrequencyproductscom
If you require further information please
contact one of our Sales offices
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Who do I contact at IQD for technical assistance
9
Either call one of our Sales offices and ask
for Applications Support
Or contact our Applications Support
department direct via email
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Thinking of changing an existing design from using thru-hole crystals to SMD crystals ndash what do I need to consider
10
This depends upon the application If for
example the crystal is pullable ie the
frequency can be changed by varying the
load capacitance of the crystal by electrical
means then this may be difficult to
achieve For example strip blank SMD
crystals have a much lower pullability than
the HC49 style round blank package
This exercise should not be undertaken
lightly please feel free to contact our
Applications Support department for
further advice
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Is it preferable to design-in a crystal or an oscillator for my application
11
This depends upon the application If you
are designing a discrete circuit and have
little or no experience of oscillator design
then it may be preferable to use a
packaged oscillator since this will remove
any tolerance issues
Itrsquos easy to design a one off for lab use
but if you have to manufacture large
numbers in volume this may give rise to all
sorts of issues
If you are using a chipset which requires a
crystal to drive it then this decision is much
simpler since the on board oscillator circuit
should have been optimised
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
What are the differences between SPXOs VCXOs TCXOs and OCXOs
12
SPXO (or Clock Oscillator)
The basic type of oscillator and consists of a crystal and a basic drive circuit Since there is no form of compensation the frequency temperature stability is essentially that of the crystal itself ndash typically plusmn50ppm
VCXO (Voltage Controlled Crystal Oscillator)
An oscillator which relies on the inherent pullability of the quartz crystal in order to allow the output frequency of the oscillator output to be changed by application of an external voltage This change is limited to a few tens of ppm typically plusmn100ppm As with SPXOs the frequencytemperature stability is that of the crystal itself
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
13
TCXO (Temperature Compensated Crystal Oscillator)
Where the stability of the crystal is not sufficient it may be necessary to use a TCXO This type of device is used where the stability of a basic quartz crystal is insufficient Typically TCXOs can achieve a stability of less than 1ppm as opposed to a typical crystal of 30ppm
OCXO (Oven Controlled Crystal Oscillator)
The ultimate piezoelectric product is the OCXO Where a high stability is required then this type of product should be considered These types of devices offer performances of typically 3E10-9
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Are products still available that were previously in the Data Book or on the website but do not appear currently
14
Often this is the case but not in all
situations
If a product has become obsolete then
please discuss with Applications Support
in most cases a suitable alternative product
can be offered
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Does IQD offer a quick turnaround on oscillators
15
Yes
If the device that you are looking for is not
a stock part then in some cases a
programmable version may be available
These are compatible with the fixed
frequency device and can often be
supplied in a few working days ndash custom
fixed frequency may take at least 6 weeks
to produce
Programmable oscillators particularly lend
themselves to prototyping where time is
critical
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Are IQDs products available through Distribution
16
In most cases yes
Please look on our website to see a list of
our Distributors and Reps
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Does IQD offer products which are not on its website or in the Data Book
17
Yes
Our Engineering department is constantly
developing our product range and indeed
much of its capability is in customisation
In any event please contact us
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Why are crystal packages getting smaller
18
This situation is being driven by the
electronics industry in general and the
need for more portability in particular
There is a downside to this however which
is that the smaller the crystal blank the
higher the starting frequency
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
What are the most cost effective crystal and oscillator packages to consider for new designs
19
For quartz crystals the HC494HSMX and
for oscillators (SPXOs) the CFPS-72CFPS-
73
Please contact one of our Sales offices for
more information
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Can I obtain the test results for my products
20
Samples are automatically despatched
with the appropriate test results
Production quantities are tested to the
appropriate AQL level and the results
retained within our company records
For further information please contact us
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
What is the most common cut of quartz crystal
21
AT cut quartz accounts for the majority of
crystals produced in the 1 to 200MHz
range
This refers to the nominal angle with
respect to the Z axis of the quartz bar
The angle of cut determines the
frequency temperature performance and
is usually selected by the crystal
manufacturer
Standing out from the crowd
22
Standing out from the crowd
22