Seven Band Graphic Equalizer Data Sheet

1 Seven band Graphic EqualizerData Sheet5/2011 DescriptionThe Seven band Graphic Equalizer IC is a CMOS chip that divides the audio spectrum into Seven bands, 63Hz, 160Hz, 400Hz, 1kHz, , 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 than coupling and decoupling capacitors, no other external components are needed.

2 The chip supply can be between and 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. FeaturesLow Power ConsumptionOnly Two External ComponentsOn Chip Ground ReferenceSwitched - Capacitor or 5 volt Operation20 dB of Gain TypicalOn Chip OscillatorOutput MultiplexorVariable Decay Time8 Pin PackageApplicationsPortable StereosCar StereosHi-Fi StereosSpectrum AnalyzersAbsolute Maximum RatingsPower Supply Voltage +6 VStorage Temperature -60 to + 150 COperating Temperature 0 to 70 C MSGEQ72000 63 160 400 1000 2500 6250 16000 Frequency Response

3 Web Site 2011 Mixed Signal Integration 1 Electrical Characteristics_____( VDD = + , T = 25 C) Seven band Graphic Equalizer data SheetoMSGEQ7 Web Site 2011 Mixed Signal Integration 2 PARAMETERSYMBOLCONDITIONSMIN TYP MAX UNITSDC Specifications Operating CurrentIDD1 Mohm Load on Output mAOutput DriveIO1mAOutput ImpedanceZO700ohmsOutput OffsetVOS600 mVBand Offset DifferenceSame device200 mVAC SpecificationsGainAVPeak input to DC output, Vin= 100 mVpp, fin = 1 kHz20 22 24dBFilter SwingVin = , fin = 1 kHz 4 VClock FrequencyFCLK C = 33 pF*.

4 R = 200 kohms 145 165 180 kHzInput ImpedanceZIN1 Mohm* includes stray capacitance Evaluation SchematicSeven band Graphic EqualizerData SheetBlock Diagram_____Pin Configuration1. VDD Positive Power Supply Typically 5 Volts2. VSS Negative Power Supply Typically 0 Volts3. OUT Multiplexed DC Output4. STROBE Channel Selection Pin5. IN Audio Input6. GND Internally Generated Ground RESET Resets Multiplexor8. CKIN Clock Oscillator Pin Pin Description_____5 VDDA CKINVSSA RESETOUT GNDSTROBE StrobeAudioInCKINDC OutMSGEQ7 PeakDetectorPeakDetector63 HzBandpass160 HzBandpass Web Site 2011 Mixed Signal Integration 3 Seven band Graphic Equalizer data SheetTypical Application_____Multiplexor OperationThe DC peak output for measurement is se-lected using the reset and strobe pins.

5 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, , , 16kHz etc.) and this will re-peat indefinitely. The multiplexor read rate is also the output decay time control. Each read decays that channel approximately 10%. The strobe timing is shown below: Web Site 2011 Mixed Signal Integration 4 Mixed Signal Integration Corporation reserves the right to change any product or specification without notice at any time.

6 Mixed Signal Integration products are not designed or authorized for use in life support systems. Mixed Signal Integration assumes no responsibility for errors in this docu-ment. MSGEQ7trtrsRESET tstssSTROBEtoOUTPUT63 Hz160 Hz400 Hz1 kHz16 kHz63 Hz160 Hztr - Reset Pulse Width100 nS mintrs - Reset to Strobe Delay72uS mints - Strobe Pulse Width18 uS mintss - Strobe to Strobe Delay72uS minto - Output Settling Time36 uS min(with Cload = 22 pF and Rload = 1 Mohm)Strobe Timing DiagramOrdering Information_____Part Number Package Operating Temperature MSGEQ7N 8 Pin 150 mils SOIC 0-70 CMSGEQ7P 8 Pin 300 mils PDIP 0-70 Coo