ADAU1787Z低功耗音频解决方案

ADIADAU1787Z低功耗音频DSP解决方案ADI公司的ADAU1787Z是集成了两个低功耗音频DSP的和两个输入和一个输出的CODEC，模拟输入到DSP核到模拟输出的通路进行优化,以到到低等待和非常适合于手持设备的噪音消除•仅需要增几个外接的无源元件，ADAU1787Z就提供噪音消除耳机解决方案.ADAU1787Z具有可编程FastDSP音频处理引擎，高达768kNz取样速率•器件具有双四元滤波器,限幅器，音量控制和混合器,28位SigmaDSP音频处理核，高达50MIPS性能,低等待24位ADC和DAC,96dBSNR(信号通过带A加权滤波器的PGA和ADC),105dB组合SNR(信号通过带A加权滤波器DAC和耳机)，频率8kHz到768kHz的串口fSYNC，模拟输入到模拟输出的群时延5ps(取样频繁768kHz),PLL支持30kHz到27MHz的任何输入时钟速率，具有全双工4路ASRC,主要用于噪音消除的手持设备和耳机，蓝牙ANC手持设备和耳机,个人导航设备(PNA)，数码相机和视频摄像机，乐器效应处理器，多媒体扬声器系统和智能手机•本文介绍了ADAU1787Z主要特性，功能框图，以及评估板EVAL-ADAU1787Z主要特性,电路图，材料清单和PCB设计图.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图图1.ADAU1787Z功能框图1analogdifferentialaudiooutput,configurableaseitherlineoutputorheadphonedriverPLLsupportinganyinputclockratefrom30kHzto27MHzFull-duplex,4-channelASRCs16-channelserialaudioportsupportingI2S,leftjustified,oruptoTDM168interpolatorsand8decimatorswithflexibleroutingPowersuppliesAnalogAVDDat1.8VtypicalDigitalI/OIOVDDat1.1Vto1.98VDigitalDVDDat0.9VtypicalLowpower(8.030mWfortypicalpowerconsumption)I2CandSPIcontrolinterfacesFlexibleGPIO42-ball,0.35mmpitch,2.695mmx2.320mmWLCSPADAU1787Z应用：Noisecancellinghandsets,headsets,andheadphonesBluetoothANChandsets,headsets,andheadphonesPersonalnavigationdevicesDigitalstillandvideocamerasMusicalinstrumenteffectprocessorsMultimediaspeakersystemsSmartphonesLI«LX_s_0Qs«_w/rnjH应COnTRTTHLI«LX_s_0Qs«_w/rnjH应COnTRTTH图2.ADAU1788带模拟麦克风自引导模式的系统框图评估板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.评估板EVAL-ADAU1787Z包括：EVAL-ADAU1787ZevaluationboardEVAL-ADUSB2EBZ(USBi)communicationsadapterUSBcablewithminiUSBplug

图3.评估板EVAL-ADAU1787Z外形图DCWTifT^Cff.'1-mrrri^smr-irs「M比TeRH5-ElElUUlOfti^ClWIMAK图4•评估板EVAL-ADAU1787Z默认跳线和开关设定图图5.评估板EVAL-ADAU1787Z电路图:ADAU1787图6.评估板EVAL-ADAU1787Z电路图:电源评估板EVAL-ADAU1787Z材料清单:如1>e就rlpLlBHV^lu：«Vendo-rV«nd4)«OlderNurniben2CIC2Ctramkcafwdtor^^7.0mF,MV.X7ft121047.0kfAjr^fog[W54W_4§44-Ii-ND2C3rC5Mjjhllayefcefanuccapacxor^.25VNPO,020>115pFAnalcigDevices■WO9659-I-ND6ClCis.G^,匸兔申匸鮎JvUjItilayiercerarnic【晒cRon,6-3v,?股侦2OomminsertAnaFog就衿12d口口氏QQ.C22.C25Mdhlhyefcefamlecap^chori,63V.能孔D201lOOnFAm^fog□evicts49O-3.1fi7-l-ND6C16,C21,C3^匚轮C51■匚59JvUiklla^rceramiccapacitors,6JV,K7RMO2IjlFAnalogDevictsJ11-1702-I-ND3CIlXlgQSWuftllayiercerarnkcapautrnj*X7f«)eos叶An^rogD叶k邸4W-3905-1-ND/■H5-«g57.kND3cis.GD.匚saMuhllayefceramiccapacitor^16'<K7R0601L0|lFAnalogDevices49O-1MO-I-ND2GCMMuftllajnefceramic-capacrtCTX眉耳冥枫OJO|/Anafog口吋如4W-3^6l-i-ND4C35.CS6.C41,C42MurEllayeiceramiccapacAor^,62V.XSH0402]OpFAn^rog4«>I3.21I-1-ND1cwMiihllayefcefanilc^apacitor,16V,K7R,0601NFAnalogDevices597-1241-1-ND2SMDMrrtalLmca的dtars,SimDb63V470JJFAnafogD申就科71^-155^1-ND1C£2Muhllayefceramlcopadc^,GOV,NPO,0402LOfiFAnalogDolces4^>324+L-ND1⑻Muftllayiefceranilc^pacrt'Df,25V,^K>210rrfMaTog口嘛那490-6MH-ND3□lice03Sdiartk^如yOLE氏SOD!23dlQieS^tioTtyAn^rogDeicesMERDEJOTtGOSCT-ND1JIlfl-wa/slwoudpolarlzedlheader訓5AnalogDewcesMHC1W-ND]J2MillpowerJack.0.0SIn.」dghi刼ql匕Wcau^h1仙RAPCJ22XAn占阳gD^rsSCI3OND2：DJ3&.J362-pinheaderun^ltfoudedjum^is.aiflln.吹ShunET>CO8ail545-22-jkimaerAfiaFogDeMcesS9OI1E-O2-ND3MrJ9sJ4D1fl-wayC2x5)unshewsfed0.1Inheaders2x5AnalogCe*CiH5W11EC-05-ND1£SwayLir^hjoudedheaderdual2頭AtiaFo^DevicesS2OI1E-4M-ND.SirCij[S2Q11E-3&-ND2J6rJ712-waysocketurtshrcwjded2k&AnalogDewcei571D9-^DSjevllpmjli%J1S.JI7J32.JJ42>p«hhOJdi^ruiidludiud^djuhif^erl,0.1Dihxul^SlauhtT^8BI.§4S-22>lurti^r园耐[W®SWIIE^ND2JI3,J162-pinheaderurkshraud&dJumperdlDIn.DoinxxInserti^fialogDeMcesSWI1E4J2-ND9JKJMlpJKMU3Q」琨JPIrJP3J-P*nsingleInlinepwEniStf)headerlJunoerAngfogD*w：«SW11E-03-ND6J阳to12弓Stereominijack5MT5J-3523-5MTAnalogDevofsCP-35235JCT-ND]加1卜翊孑un^hr^udcdAin^fogD凶®敝汕E*N口2J3LJ38BindingpostmlnlunlnsulaKdt^ethroughholeNickelbliMfingpostAnaro^DevicesJ5B7-ND1U76-wayunshroudedlheatfer2K3AnalogDeuces52S11E4J3-ND

图7•评估板EVAL-ADAU1787ZPCB设计图:顶层装配图图8.评估板EVAL-AD