AKMAK7757集成音频DSP的数字音频解决方案.doc

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1、AKMAK7757集成音频DSP的数字音频解决方案AKM公司的AK7757是一款内置4通道DAC、一个可选输入立体声ADC通道、一个单声道ADC和一个数字音频接口的数字音频信号处理器。该音频数字信号处理器具有在48kHz的采样速率下达到1536阶的并行算法操作性能。本文详细介绍了AK7757的主要特性、内部框图、内部DSP框图以及采用AK7757芯片设计的评估开发板，通过评估板详细介绍了AK7757芯片各种模式下的应用设置及测试，评估板主要有评估板框图、电路原理图。TheAK7757isadigitalsignalprocessorwithanintegr

2、ated4chDAC,astereoADCwithinputselector,amonoADCandanintegrateddigitalaudiointerface.TheaudioDSPhas1536step/fs(at48kHzsampling)parallelarithmeticoperationperformance.AstheAK7757isaRAMbasedDSP,itisprogrammableforuserrequirementstorealizetheaudioeffectsprocessortheproprietaryhigh-per

3、formanceHF.Itishousedina48pinLQFPwhichisasmallpackagetosavethePCBspace.AK7757主要特性?DSP-Wordlength:24bits(DataRAM:F24floatingpoint)-ProcessingSpeed:13.6ns(9216step/fs;fs=8kHz)-Multiplication:20x20→36-bitDoubleprecisionarithmeticavailable-Divider20/20→20-bit-ALU:40-bitarith

4、meticoperation(overflowmargin4bits)24-bitfloatingpointarithmeticandlogicoperation-ProgramRAM:4096x36bits-CoefficientRAM:4096x20bits-DataRAM:2048x24bits(F24floatingpoint)-DelayRAM:4096x20bits,4096x20bits-MasterClock:73.7MHz-JXpins(interrupt)?2chADC1-SamplingFrequency:8kHz~48kHz-3in

5、/1outInputSelector(Diffrentialx1singleendx1singleendwithMicAmpx1)-ADCS/N:96dBA,S/(N+D):88dB?1chADC2-SamplingFrequency:8kHz~48kHz-ADCS/N:89dBA,S/(N+D):82dB?4chDAC-SamplingFrequency:8kHz~48kHz-DACS/N:107dBA,S/(N+D):92dB?MicrophoneInterface-Differentialorsingle-endinput-ProgrammableG

6、ain(+33dB~+15dBand0dB,3dBstep)-LowNoiseMicrophoneBias?AutomaticPowerDown(CODEC,DSP)?μPI/F:SPI,I2C?PowersupplyAnalog(AVDD):3.0V~3.6V(typ.3.3V)Digital1(DVDD):3.0V~3.6V(typ.3.3V)Digital2(DVDD18):1.7V~1.9V(typ.1.8V)?Operatingtemperaturerange:-40℃~85℃?Package:48pinLQFP图1.内部框图图2.内部DS

7、P框图采用AK7757评估板参考设计TheAKD7757-AisanevaluationboardforAK7757,whichisahighlyintegrateddigitalsignalprocessorwithanintegrated4chDAC,astereoADCwithinputselector,amonoADCandanintegrateddigitalaudiointerface.Thisboardiscomposedofamainboardandasubboard.TheAKD7757-Acanbeset-upbyaPCviaUSBpo

8、rt.RCAconnectorisusedforbothinput