Datasheet

ManualsBrandsUnbranded ManualsLinear ICsLinear IC - Custom audio Car stereo, Consumer audio, Car stereo, Media players DIP 8

Seven Band Graphic Equalize

Data Shee

5/2011

Description

The seven band graphic equalizer IC is a CMOS chip

that divides the audio spectrum into seven bands,

63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and

16kHz. The seven frequencies are peak detected

and multiplexed to the output to provide a DC repre-

sentation of the amplitude of each band. No external

components are needed to select the filter respons-

es. Only an off chip resistor and capacitor are

needed to select the on chip clock oscillator fre-

quency. The filter center frequencies track this fre-

quency.

Other than coupling and decoupling capacitors, no

other external components are needed. The chip

supply can be between 2.7 and 5.5 volts with 5 volts

providing the best performance. The device has

very 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 multiplexor

readout rate also controls the decay time (10% de-

cay per read), so no external pins are needed for this

function.

Features

Low Power Consumption

Only Two External Components

On Chip Ground Reference

Switched - Capacitor Filters

3.3 or 5 volt Operation

20 dB of Gain Typical

On Chip Oscillator

Output Multiplexor

Variable Decay Time

8 Pin Package

Applications

Portable Stereos

Car Stereos

Hi-Fi Stereos

Spectrum Analyzers

Absolute Maximum Ratings

Power Supply Voltage +6V

Storage Temperature -60 to + 150 C

Operating Temperature 0 to 70 C

MSGEQ7

63 160 400 1000 2500 6250 16000

Frequency Response

Summary of content (4 pages)

PAGE 1
5/2011 Seven Band Graphic Equalizer Data Sheet Features The seven band graphic equalizer IC is a CMOS chip that divides the audio spectrum into seven bands, 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and 16kHz. The seven frequencies are peak detected and multiplexed to the output to provide a DC representation of the amplitude of each band. No external components are needed to select the filter responses. Only an off chip resistor and capacitor are needed to select the on chip clock oscillator frequency.
PAGE 2
Seven Band Graphic Equalizer Data Sheet Electrical Characteristics_________ o ( VDD = +5.0V, T = 25 C) SYMBOL CONDITIONS MIN TYP MAX 2.7 5.0 5.5 0.5 0.8 1.
PAGE 3
Seven Band Graphic Equalizer Data Sheet Pin Description_________________ 1. VDD 3. 4. 5. 6. OUT STROBE IN GND 7. RESET 8. CKIN Positive Power Supply Typically 5 Volts Negative Power Supply Typically 0 Volts Multiplexed DC Output Channel Selection Pin Audio Input Internally Generated Ground Reference.Typically 2.5V Resets Multiplexor Clock Oscillator Pin VDDA CKIN VSSA RESET OUT GND STROBE 5 MSGEQ7 2.
PAGE 4
Seven Band Graphic Equalizer Data Sheet Typical Application______________ Multiplexor Operation The DC peak output for measurement is selected 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 repeat indefinitely.