ADAU1787Z低功耗音頻解決方案

ADIADAU1787Z低功耗音頻DSP解決方案ADI公司的ADAU1787Z是集成了兩個低功耗音頻DSP的和兩個輸入和一個輸出的CODEC，模擬輸入到DSP核到模擬輸出的通路進行優(yōu)化,以到到低等待和非常適合于手持設備的噪音消除?僅需要增幾個外接的無源元件，ADAU1787Z就提供噪音消除耳機解決方案.ADAU1787Z具有可編程FastDSP音頻處理引擎，高達768kNz取樣速率?器件具有雙四元濾波器,限幅器，音量控制和混合器,28位SigmaDSP音頻處理核，高達50MIPS性能,低等待24位ADC和DAC,96dBSNR(信號通過帶A加權濾波器的PGA和ADC),105dB組合SNR(信號通過帶A加權濾波器DAC和耳機)，頻率8kHz到768kHz的串口fSYNC，模擬輸入到模擬輸出的群時延5ps(取樣頻繁768kHz),PLL支持30kHz到27MHz的任何輸入時鐘速率，具有全雙工4路ASRC,主要用于噪音消除的手持設備和耳機，藍牙ANC手持設備和耳機,個人導航設備(PNA)，數(shù)碼相機和視頻攝像機，樂器效應處理器，多媒體揚聲器系統(tǒng)和智能手機?本文介紹了ADAU1787Z主要特性，功能框圖，以及評估板EVAL-ADAU1787Z主要特性,電路圖，材料清單和PCB設計圖.TheADAU1788isacodecwithtwoinputsandoneoutputthatincorporatestwodigitalsignalprocessors(DSPs).ThepathfromtheanaloginputtotheDSPcoretotheanalogoutputisoptimizedforlowlatencyandisidealfornoisecancellingheadsets.Withtheadditionofjustafewpassivecomponents,theADAU1788providesanoisecancellingheadphonesolution.Notethatthroughoutthisdatasheet,multifunctionpins,suchasBCLK_0/MP1,arereferredtoeitherbytheentirepinnameorbyasinglefunctionofthepin,forexample,BCLK_0,whenonlythatfunctionisrelevant.ADAU1787Z主要特性：ProgrammableFastDSPaudioprocessingengineUpto768kHzsamplerateBiquadfilters,limiters,volumecontrols,mixing28-bitSigmaDSPaudioprocessingcoreVisuallyprogrammableusingSigmaStudioUpto50MIPSperformaneeLowlatency,24-bitADCsandDAC96dBSNR(signalthroughPGAandADCwithA-weightedfilter)105dBcombinedSNR(signalthroughDACandheadphonewithA-weightedfilter)SerialportfSYNCfrequencyfrom8kHzto768kHz5psgroupdelay(fS=768kHz)analogintoanalogout2single-endedanaloginputs,configurableasmicrophoneorlineinputs4digitalmicrophoneinputs圖圖1.ADAU1787Z功能框圖1analogdifferentialaudiooutput,configurableaseitherlineoutputorheadphonedriverPLLsupportinganyinputclockratefrom30kHzto27MHzFull-duplex,4-channelASRCs16-channelserialaudioportsupportingI2S,leftjustified,oruptoTDM168interpolatorsand8decimatorswithflexibleroutingPowersuppliesAnalogAVDDat1.8VtypicalDigitalI/OIOVDDat1.1Vto1.98VDigitalDVDDat0.9VtypicalLowpower(8.030mWfortypicalpowerconsumption)I2CandSPIcontrolinterfacesFlexibleGPIO42-ball,0.35mmpitch,2.695mmx2.320mmWLCSPADAU1787Z應用：Noisecancellinghandsets,headsets,andheadphonesBluetoothANChandsets,headsets,andheadphonesPersonalnavigationdevicesDigitalstillandvideocamerasMusicalinstrumenteffectprocessorsMultimediaspeakersystemsSmartphonesLI?LX_s_0Qs?_w/rnjH應COnTRTTHLI?LX_s_0Qs?_w/rnjH應COnTRTTH圖2.ADAU1788帶模擬麥克風自引導模式的系統(tǒng)框圖評估板EVAL-ADAU1787ZEvaluatingtheADAU1787Four-ADC,Two-DAC,LowPowerCodecwithAudioDSPsThisuserguideexplainsthedesignandsetupoftheEVAL-ADAU1787Zevaluationboard.Thisevaluationboardprovidesaccesstoallanaloganddigitalinputs/outputsontheADAU1787.TheADAU1787coreiscontrolledbyAnalogDevices,Inc.,SigmaStudio?software,whichinterfacestotheEVAL-ADAU1787ZviaaUSBconnection.TheEVAL-ADAU1787ZcanbepoweredbytheUSBbusorbyasingle3.8Vto5Vsupply.AnyofthesesuppliesareregulatedtothevoltagesrequiredontheEVAL-ADAU1787Z.Theprintedcircuitboard(PCB)isa6-layerdesign,withagroundplaneandapowerplaneontheinnerlayers.TheEVAL-ADAU1787Zcontainsconnectorsforexternalmicrophonesandspeakers.Themasterclockcanbeprovidedexternallyorbytheon-board24.576MHzpassivecrystal.Multifunctionpinnamesmayberefereneedbytheirrelevantfunctiononly,forexample,MPx,throughoutthisuserguide.評估板EVAL-ADAU1787Z包括：EVAL-ADAU1787ZevaluationboardEVAL-ADUSB2EBZ(USBi)communicationsadapterUSBcablewithminiUSBplug

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圖7?評估板EVAL-ADAU1787ZPCB設計圖:頂層裝配圖圖8.評估板EVAL-AD