sa612
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Philips Semiconductors
SA612ADouble-balanced mixer and oscillator
Product specificationReplaces data of September 17, 1990 1997 Nov 07
RF COMMUNICATIONS PRODUCTS
IC17 Data Handbook
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
21997 Nov 07 853-0391 18662
DESCRIPTIONThe SA612A is a low-power VHF monolithic double-balanced mixerwith on-board oscillator and voltage regulator. It is intended for lowcost, low power communication systems with signal frequencies to500MHz and local oscillator frequencies as high as 200MHz. Themixer is a “Gilbert cell” multiplier configuration which provides gainof 14dB or more at 45MHz.
The oscillator can be configured for a crystal, a tuned tankoperation, or as a buffer for an external L.O. Noise figure at 45MHzis typically below 6dB and makes the device well suited for highperformance cordless phone/cellular radio. The low powerconsumption makes the SA612A excellent for battery operatedequipment. Networking and other communications products canbenefit from very low radiated energy levels within systems. TheSA612A is available in an 8-lead dual in-line plastic package and an8-lead SO (surface mounted miniature package).
FEATURES• Low current consumption
• Low cost
• Operation to 500MHz
• Low radiated energy
• Low external parts count; suitable for crystal/ceramic filter
• Excellent sensitivity, gain, and noise figure
PIN CONFIGURATIOND, N Packages
8
7
6
5
1
2
3
4
INPUT A
INPUT B
GND
OUTPUT A
OSCILLATOR
OSCILLATOR
OUTPUT B
VCC
SR00098
Figure 1. Pin Configuration
APPLICATIONS• Cordless telephone
• Portable radio
• VHF transceivers
• RF data links
• Sonabuoys
• Communications receivers
• Broadband LANs
• HF and VHF frequency conversion
• Cellular radio mixer/oscillator
ORDERING INFORMATIONDESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #
8-Pin Plastic Dual In-Line Plastic (DIP) -40 to +85°C SA612AN SOT97-1
8-Pin Plastic Small Outline (SO) package (Surface-Mount) -40 to +85°C SA612AD SOT96-1
BLOCK DIAGRAM
8 7 6 5
4321
OSCILLATORVOLTAGEREGULATOR
GROUND
VCC
SR00099
Figure 2. Block Diagram
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 3
ABSOLUTE MAXIMUM RATINGSSYMBOL PARAMETER RATING UNIT
VCC Maximum operating voltage 9 V
TSTG Storage temperature -65 to +150 °C
TA Operating ambient temperature range SA612A -40 to +85 °C
AC/DC ELECTRICAL CHARACTERISTICS TA=25°C, VCC = 6V, Figure 3
SYMBOL PARAMETER TEST CONDITIONLIMITS
UNITSYMBOL PARAMETER TEST CONDITIONMin Typ Max
UNIT
VCC Power supply voltage range 4.5 8.0 V
DC current drain 2.4 3.0 mA
fIN Input signal frequency 500 MHz
fOSC Oscillator frequency 200 MHz
Noise figured at 45MHz 5.0 dB
Third-order intercept point at 45MHz RFIN=-45dBm -13 dBm
Conversion gain at 45MHz 14 17 dB
RIN RF input resistance 1.5 kΩ
CIN RF input capacitance 3 pF
Mixer output resistance (Pin 4 or 5) 1.5 kΩ
DESCRIPTION OF OPERATIONThe SA612A is a Gilbert cell, an oscillator/buffer, and a temperaturecompensated bias network as shown in the equivalent circuit. TheGilbert cell is a differential amplifier (Pins 1 and 2) which drives abalanced switching cell. The differential input stage provides gainand determines the noise figure and signal handling performance ofthe system.
The SA612A is designed for optimum low power performance.When used with the SA614A as a 45MHz cordless phone/cellular
radio 2nd IF and demodulator, the SA612A is capable of receiving-119dBm signals with a 12dB S/N ratio. Third-order intercept istypically -15dBm (that’s approximately +5dBm output interceptbecause of the RF gain). The system designer must be cognizant ofthis large signal limitation. When designing LANs or other closedsystems where transmission levels are high, and small-signal orsignal-to-noise issues not critical, the input to the SA612A should beappropriately scaled.
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 4
TEST CONFIGURATION
8 7 6 5
4321
OUTPUT
150pF
330pF
120pF
1.5 to
100nF
220pF
INPUT
47pF
22pF1nF
100nF10nF
VCC
6.8µF
5.5µH
0.209 to0.283µH
44.2µH
10pF34.545MHz THIRD OVERTONE CRYSTAL
612A
0.5 to 1.3µH
SR00101
Figure 3. Test Configuration
12
3
4 5
6
7
8
GND
BUFFER1.5k
BIAS BIAS
BIAS
1.5k
1.5k 1.5k
VCC
18k
25k
SR00102
Figure 4. Equivalent Circuit
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 5
Besides excellent low power performance well into VHF, theSA612A is designed to be flexible. The input, output, and oscillatorports can support a variety of configurations provided the designerunderstands certain constraints, which will be explained here.
The RF inputs (Pins 1 and 2) are biased internally. They aresymmetrical. The equivalent AC input impedance is approximately1.5k || 3pF through 50MHz. Pins 1 and 2 can be usedinterchangeably, but they should not be DC biased externally. Figure5 shows three typical input configurations.
The mixer outputs (Pins 4 and 5) are also internally biased. Eachoutput is connected to the internal positive supply by a 1.5kΩresistor. This permits direct output termination yet allows forbalanced output as well. Figure 6 shows three single-ended outputconfigurations and a balanced output.
The oscillator is capable of sustaining oscillation beyond 200MHz incrystal or tuned tank configurations. The upper limit of operation isdetermined by tank “Q” and required drive levels. The higher the Qof the tank or the smaller the required drive, the higher the
permissible oscillation frequency. If the required L.O. is beyondoscillation limits, or the system calls for an external L.O., the
external signal can be injected at Pin 6 through a DC blockingcapacitor. External L.O. should be 200mVP-P minimum to 300mVP-Pmaximum.
Figure 7 shows several proven oscillator circuits. Figure 7a isappropriate for cordless phones/cellular radio. In this circuit a thirdovertone parallel-mode crystal with approximately 5pF loadcapacitance should be specified. Capacitor C3 and inductor L1 actas a fundamental trap. In fundamental mode oscillation the trap isomitted.
Figure 8 shows a Colpitts varacter tuned tank oscillator suitable forsynthesizer-controlled applications. It is important to buffer theoutput of this circuit to assure that switching spikes from the firstcounter or prescaler do not end up in the oscillator spectrum. Thedual-gate MOSFET provides optimum isolation with low current.The FET offers good isolation, simplicity, and low current, while thebipolar circuits provide the simple solution for non-criticalapplications. The resistive divider in the emitter-follower circuitshould be chosen to provide the minimum input signal which willassume correct system operation.
INPUT
612A
1 2
612A
1 2
612A
1 2
a. Single-Ended Tuned Input b. Balanced Input (For Attenuationof Second-Order Products)
c. Single-Ended Untuned Input
SR00103
Figure 5. Input Configuration
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 6
612A
4
5
612A
4
5
612A
4
5
612A
4
5
a. Single-Ended Ceramic Filter b. Single-Ended Crystal Filter
c. Single-Ended IFT d.. Balanced Output
CFU455or Equivalent
12pF CT*
*CT matches 3.5k Ω to next stage
Filter K&L 38780 or Equivalent
SR00104
Figure 6. Output Configuration
612A
4
5
a. Colpitts Crystal Oscillator(Overtone Mode)
b. Colpitts L/C Tank Oscillator c. Hartley L/C Tank Oscillator
3
6
2
7
1
8
612A
4
5
3
6
2
7
1
8
612A
4
5
3
6
2
7
1
8
TC02101S TC02111S TC02121S
XTAL
L1
C1
C2C3
SR00105
Figure 7. Oscillator Circuits
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 7
612A
4 5
3 6
2 7
1 8
+6V
7pF 10pF
TOBUFFER
DC CONTROL VOLTAGEFROM SYNTHESIZER
MV2105OR EQUIVALENT
1000pF
1000pF
5.5µH
0.10pF10µF
0.06µH
0.1µF
3SK126100k
2pF TO SYNTHESIZER
100k
100k
330
2k
TO SYNTHESIZER
2N5484
2N918
0.01µF
0.01µF
1.0nF
0.01pF
SR00106
Figure 8. Colpitts Oscillator Suitable for Synthesizer Applications and Typical Buffers
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 8
TEST CONFIGURATION
8 7 6 5
4321SFG455A3
100nF
220pF
INPUT
47pF
22pF
1nF
100nF 10nF
VCC
6.8µF
0.5 to 1.3µH
0.209 to 0.283µH
5.6pF44.545MHz THIRD OVERTONE CRYSTAL
612A
OR EQUIVALENT455kHZ
45MHz IN
5.5µH
SR00107
Figure 9. Typical Application for Cordless/Cellular Radio
Philips Semiconductors Product specification
SA612ADouble-balanced mixer and oscillator
1997 Nov 07 9
3.50
3.25
3.00
2.75
2.50
2.25
2.00
1.75
1.50
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
SU
PP
LY C
UR
RE
NT
9m
A)
TEMPERATURE OC
4.5V
6.0V
8.5V
SR00108
Figure 10. I CC vs Supply Voltage
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
20.0
19.5
19.0
18.5
18.0
17.5
17.0
16.5
16.0
15.5
15.0
14.5
14.0
CO
NV
ER
SIO
N G
AIN
(dB
)
TEMPERATURE OC
4.5V
6.0V8.5V
SR00109
Figure 11. Conversion Gain vs Supply Voltage
–10.0
–10.5
–11.0–11.5
–12.0
–12.5
–13.0
–13.5
–14.0
INP
UT
INT
ER
CE
PT
PO
INT
(dB
m)
–14.5
–15.0
–15.5
–16.0
–16.5
–17.0
TEMPERATURE OC
–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
SR00110
Figure 12. Third-Order Intercept Point
6.00
5.75
5.50
5.25
5.00
4.75
4.50
4.25
4.00–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90
NO
ISE
FIG
UR
E (
dB)
TEMPERATURE OC
4.5V6.0V8.5V
SR00111
Figure 13. Noise Figure
–80 –60 –40 –20 0 20
20
0
–20
–40
–60
3rd ORDER PRODUCT
FUND. PRODUCT
IF O
UT
PU
T P
OW
ER
(dB
m)
RF INPUT LEVEL (dBm)
RF1 = 45MHz, IF = 455kHz, RF2 = 45.06MHz
SR00112
Figure 14. Third-Order Intercept and Compression
–10
–11
–12
–13
–14
–15
–16
–17
–18
4 5 6 7 8 9 10
VCC (VOLTS)
INT
ER
CE
PT
(dB
m)
SR00113
Figure 15. Input Third-Order Intermod Point vs V CC
Double-balanced mixer oscillator
Philips Semiconductors Product specification
SA612
1997 Nov 07 10
SO8: plastic small outline package; 8 leads; body width 3.9mm SOT96-1
Double-balanced mixer oscillator
Philips Semiconductors Product specification
SA612
1997 Nov 07 11
DIP8: plastic dual in-line package; 8 leads (300 mil) SOT97-1
Double-balanced mixer oscillator
Philips Semiconductors Product specification
SA612
1997 Nov 07 12
Philips Semiconductors and Philips Electronics North America Corporation reserve the right to make changes, without notice, in the products,including circuits, standard cells, and/or software, described or contained herein in order to improve design and/or performance. PhilipsSemiconductors assumes no responsibility or liability for the use of any of these products, conveys no license or title under any patent, copyright,or mask work right to these products, and makes no representations or warranties that these products are free from patent, copyright, or maskwork right infringement, unless otherwise specified. Applications that are described herein for any of these products are for illustrative purposesonly. Philips Semiconductors makes no representation or warranty that such applications will be suitable for the specified use without further testingor modification.
LIFE SUPPORT APPLICATIONSPhilips Semiconductors and Philips Electronics North America Corporation Products are not designed for use in life support appliances, devices,or systems where malfunction of a Philips Semiconductors and Philips Electronics North America Corporation Product can reasonably be expectedto result in a personal injury. Philips Semiconductors and Philips Electronics North America Corporation customers using or selling PhilipsSemiconductors and Philips Electronics North America Corporation Products for use in such applications do so at their own risk and agree to fullyindemnify Philips Semiconductors and Philips Electronics North America Corporation for any damages resulting from such improper use or sale.
This data sheet contains preliminary data, and supplementary data will be published at a later date. PhilipsSemiconductors reserves the right to make changes at any time without notice in order to improve designand supply the best possible product.
Philips Semiconductors811 East Arques AvenueP.O. Box 3409Sunnyvale, California 94088–3409Telephone 800-234-7381
DEFINITIONS
Data Sheet Identification Product Status Definition
Objective Specification
Preliminary Specification
Product Specification
Formative or in Design
Preproduction Product
Full Production
This data sheet contains the design target or goal specifications for product development. Specificationsmay change in any manner without notice.
This data sheet contains Final Specifications. Philips Semiconductors reserves the right to make changesat any time without notice, in order to improve design and supply the best possible product.
Copyright Philips Electronics North America Corporation 1997All rights reserved. Printed in U.S.A.
This datasheet has been download from:
www.datasheetcatalog.com
Datasheets for electronics components.
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