MSGEQ7 5/2011 Seven Band Graphic Equalizer Data Sheet Description Features The seven band graphic equalizer IC is a CMOS chip Low Power Consumption that divides the audio spectrum into seven bands, Only Two External Components 63Hz, 160Hz, 400Hz, 1kHz, 2.5kHz, 6.25kHz and On Chip Ground Reference 16kHz. The seven frequencies are peak detected Switched - Capacitor Filters and multiplexed to the output to provide a DC repre- 3.3 or 5 volt Operation sentation of the amplitude of each band. No external 20 dB of Gain Typical components are needed to select the filter respons- On Chip Oscillator es. Only an off chip resistor and capacitor are Output Multiplexor needed to select the on chip clock oscillator fre- Variable Decay Time quency. The filter center frequencies track this fre- 8 Pin Package quency. Applications Other than coupling and decoupling capacitors, no other external components are needed. The chip Portable Stereos supply can be between 2.7 and 5.5 volts with 5 volts Car Stereos providing the best performance. The device has Hi-Fi Stereos very low quiescent current ( less than 1mA typical) Spectrum Analyzers 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 Absolute Maximum Ratings readout rate also controls the decay time (10% de- cay per read), so no external pins are needed for this Power Supply Voltage +6V function. Storage Temperature -60 to + 150 C Operating Temperature 0 to 70 C 20 00 63 160 400 1000 2500 6250 16000 Frequency Response Web Site www.mix-sig.com 2011 Mixed Signal Integration 1MSGEQ7 Seven Band Graphic Equalizer Data Sheet Electrical Characteristics o ( VDD = +5.0V, T = 25 C) 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 Peak input to DC output, Vin Gain AV 20 22 24 dB = 100 mVpp, fin = 1 kHz 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 * includes stray capacitance Evaluation Schematic Web Site www.mix-sig.com 2011 Mixed Signal Integration 2
