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S e v e n B a n d G r a p h i c Eq u a l i z e r

D a t a S h e e t

9/2004

D e s c r i p t i o n

The seven band graphic equalizer IC is a CMOS chipthat divides the audio spectrum into seven bands,63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and16kHz. The seven frequencies are peak detectedand multiplexed to the output to provide a DC repre-sentation of the amplitude of each band. No externalcomponents are needed to select the filter respons-es. Only an off chip resistor and capacitor areneeded to select the on chip clock oscillator fre-

quency. The filter center frequencies track this fre-quency.

Other than coupling and decoupling capacitors, noother external components are needed. The chipsupply can be between 2.7 and 5.5 volts with 5 voltsproviding the best performance. The device hasvery low quiescent current ( less than 1mA typical)for portable audio devices. The multiplexor is con-trolled by a reset and a strobe, permitting multi-plexor readout with only two pins. The multiplexorreadout rate also controls the decay time (10% de-cay per read), so no external pins are needed for thisfunction.

F e a t u r e s

Low Power ConsumptionOnly Two External ComponentsOn Chip Ground ReferenceSwitched - Capacitor Filters3.3 or 5 volt Operation20 dB of Gain TypicalOn Chip OscillatorOutput MultiplexorVariable Decay Time

8 Pin Package

A p p l i c a t i o n s

Portable StereosCar StereosHi-Fi StereosSpectrum Analyzers

A b s o l u t e M a x i m u m R a t i n g s

Power Supply Voltage +6VStorage Temperature -60 to +150 COperating Temperature 0 to 70 C

M

S GE Q

7

20

00

63 160 400 1000 2500 6250 16000

Frequency Response

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8/22/2019 MSGEQ7


Ele c t r i ca l Cha ra ct e r i s t i cs _________( VDD =+5.0V, T =25 C)


D a t a S h e e t

O r d e r i n g I n f o r m a t i o n _ _ _ _ _ _ _ _ _ _ _

Part Number Package Operating Temperature

o

MSGEQ7P 8 Pin Dip 0-70 Co

M

S GE Q

7


PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

DC Specifications

Operating Voltage VDD 2.7 5.0 5.5 V

Supply Current IDD 1 Mohm Load on Output 0.5 0.8 1.0 mA

Output Drive IO 1 mA

Output Impedance ZO 700 ohms

Output Offset VOS 600 mV

Band Offset Difference Same device 200 mV

AC Specifications

Gain AVPeak input to DC output, Vin

= 100 mVpp, fin = 1 kHz20 22 24 dB

Filter Q Q 5.5 6.0 6.5

Output Swing Vin = 0.3Vpp, fin = 1 kHz 3.5 4 V

Clock Frequency FCLK C = 33 pF*, R = 200 kohms 145 165 180 kHz

Input Impedance ZIN 1 Mohm

MSGEQ7N 8 Pin 150 mils SOIC 0-70 Co

* includes stray capacitance

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D a t a S h e e t

B lo ck D ia g ra m __________________

P i n Co n f i g u r a t i o n

1. VDD Positive Power Supply Typically 5 Volts

2. VSS Negative Power Supply Typically 0 Volts

3. OUT Multiplexed DC Output4. STROBE Channel Selection Pin5. IN Audio Input6. GND Internally Generated Ground

Reference.Typically 2.5V

7. RESET Resets Multiplexor8. CKIN Clock Oscillator Pin

P in Desc r i p t i on _________________

5

VDDA CKIN

VSSA RESET

OUT GND

STROBE IN

OutputMultiplexor

400HzBandpass

1kHzBandpass

2.5kHzBandpass

6.25kHzBandpass

16kHzBandpass

PeakDetector

PeakDetector

PeakDetector

PeakDetector

PeakDetectorClockOscillator

Anti-AliasFilter

Reset Strobe

AudioIn

CKIN

DC Out

M

S GE Q

7

PeakDetector

PeakDetector

63HzBandpass

160HzBandpass


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D a t a S h e e t

Ty p i ca l Ap p l i c a t i o n______________M u l t i p l e x o r O p e r a t i o n

The DC peak output for measurement is se-

lected using the reset and strobe pins. Reset

high resets the multiplexor. Reset low enables

the strobe pin. After the first strobe leading

edge, 63Hz output is on OUT. Each additional

strobe leading edge advances the multiplexor

one channel (63Hz, 160Hz, 400Hz, 1kHz,

2.5kHz, 6.25kHz, 16kHz etc.) and this will re-

peat indefinitely. The multiplexor read rate isalso the output decay time control. Each read

decays that channel approximately 10%. The

strobe timing is shown below:

VDD

CD0.1 uF

0.01 uF

0

•

AudioIn

DC Out

Strobe

Reset

VDD

200 k 33 pF

5 3

46

72 8

1

0

L

R

Web Site “www.mix-sig.com” © 2004 Mixed Signal Integration 4 Mixed Signal Integration Corporation reserves the right to change any product or specification without notice at any time. Mixed Signal Integrationproducts are not designed or authorized for use in life support systems. Mixed Signal Integration assumes no responsibility for errors in this docu-ment.

0

M

S GE Q7

CG0.1 uF

22K

tr trs

RESET

ts tss

STROBE

to

OUTPUT 63 Hz 160 Hz 400 Hz 1 kHz 2.5 kHz 6.25 kHz 16 kHz 63 Hz 160 Hz

tr - Reset Pulse Width 100 nS mintrs - Reset to Strobe Delay 72 uS min

ts - Strobe Pulse Width 18 uS mintss - Strobe to Strobe Delay 72 uS min

to - Output Settling Time 36 uS min (with Cload = 22 pF and Rload = 1 Mohm)

St r o b e T i m i n g D i a g r a m

msgeq7

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