AS3415_35(降噪)

amsDatasheet,Confidential:2014-Feb[1-20]AS3415/AS3435–1AS3415/AS3435IntegratedActiveNoiseCancellingSolutionwithBypassFeatureTheAS3415/35arespeakerdriverswithAmbientNoiseCancellingfunctionforheadsets,headphonesorearpieces.Theyareintendedtoimprovequalityofe.g.musiclistening,aphoneconversationetc.byreducingbackgroundambientnoise.Thefullyanalogimplementationallowsthelowestpowerconsumption,lowestsystemBOMcostandmostnaturalreceivedvoiceenhancementotherwisedifficulttoachievewithDSPimplementations.Thedeviceisdesignedtobeeasilyappliedtoexistingarchitectures.AninternalOTP-ROMcanbeoptionallyusedtostorethemicrophonesgaincalibrationsettings.TheAS3415/35canbeusedindifferentconfigurationsforbesttrade-offofnoisecancellation,requiredfilteringfunctionsandmechanicaldesigns.Thesimplerfeed-forwardtopologyisusedtoeffectivelyreducefrequenciestypicallyupto2-3kHz.Thefeed-backtopologywitheither1or2filteringstageshasitsstrengthsespeciallyatverylowfrequencies.Thetypicalbandwidthforafeed-backsystemisfrom20Hzupto1kHzwhichislowerthanthefeed-forwardsystems.Thefilterloopforbothsystemsisdeterminedbymeasurements,foreachspecificheadsetindividually,anddependsverymuchonmechanicaldesigns.Thegainandphasecompensationfilternetworkisimplementedwithcheapresistorsandcapacitorsforlowestsystemcosts.KeyBenefits&FeaturesThebenefitsandfeaturesofAS3415/35,IntegratedActiveNoiseCancellingSolutionwithBypassFeaturearelistedbelow:Figure1:AddedValueofUsingAS3415/35BenefitsFeaturesAllANCTopologiesFeedForward,FeedBackandHybridNomechanicalaudiobypassswitchIntegrateddepletionmodetransistorsMusicEQfunctionalityUltraflexiblelowpowerEQcircuitLongestplaytime10mW@1.5VstereoANC;1μAquiescentHighestaudioquality2x24mW,0.1%THD+N@32Ω,1.5VsupplyGeneralDescriptionAS3415/AS3435–2amsDatasheet,Confidential:2014-Feb[1-20]GeneralDescriptionApplicationsThedevicesareidealfor:•Earpieces•Headsets•Hands-FreeKits•MobilePhones•VoiceCommunicatingDevicesBlockDiagramThefunctionalblocksofAS3415/35forreferenceareshownbelow:Figure2:AS3415BlockDiagramSmallestpackageTwodifferentpackagesavailable:•AS3415QFN32[5x5mm]0.5mmpitch•AS3435QFN36[5x5mm]0.4mmpitchLowbatteryindicationLEDdriverwithselectabledrivingstrengthDifferentcontrolinterfaceoptionsPushButton-,Slideswitch-orI²CcontrolinterfaceHighlyinnovativeproductiontrimminginterfaceOTPproductiontrimmingviaaudiointerfaceActivehearingmodewithorwithoutANCandoptionalvoiceEQMonitormodefunctionBenefitsFeaturesamsDatasheet,Confidential:2014-Feb[1-20]AS3415/AS3435–3GeneralDescriptionFigure3:AS3435BlockDiagramAS3415/AS3435–4amsDatasheet,Confidential:2014-Feb[1-20]PinAssignmentTheAS3415andAS3435pinassignmentsaredescribedbelow.Figure4:PinAssignmentsPinAssignmentWarning:ExposedpadmustbeconnectedtoVNEG.ExposedpadmustNOTbeunconnected!amsDatasheet,Confidential:2014-Feb[1-20]AS3415/AS3435–5PinDescriptionThefollowingfigureshowsthepindescriptionforAS3415/35.Figure5:PinDescriptionPinNamePinNumberPinTypeDescriptionAS3435AS3415AGND132ANAOUTAnalogreferenceground.Donotconnectthispintopowerordigitalgroundplane.QLINL21ANAOUTLineinputEQgainstageoutputleftchannel.LINL32ANAINLineinputEQleftchannel.TRSDA43ANAINClockinputforproductiontrimming.CanbeconnectedtoLINLpintoenableproductiontrimmingvia3.5mmaudiojack.TRSCL54ANAINDatainputforproductiontrimming.CanbeconnectedtoLINRpintoenableproductiontrimmingvia3.5mmaudiojack.LINR65ANAINLineinputEQrightchannel.QLINR76ANAINLineinputEQgainstageoutputrightchannel.ANC/CSDA87DIGINSerialinterfacedataforI²CinterfaceandANCcontroltoenable/disableANC.MODE/CSCL98DIGINSerialInterfaceClockforI²Cinterfaceandcontrolpinforpowerup/downandMonitormode.MICACL109ANAOUTMicrophonepreamplifierACcouplinggroundterminal.Thispinrequiresa10μFcapacitorconnectedtoAGNDpin.MICL1110ANAINANCmicrophoneinputleftchannel.ILED1211ANAINCurrentsinkinputforon-indicationLED.MICS1312SUPOUTMicrophoneSupplyoutput.Thispinneedsanoutputblockingcapacitorwith10μF.MICR1413ANAINANCmicrophonepreamplifierinputrightchannel.MICACR1514ANAOUTMicrophonepreamplifierACcouplinggroundterminal.Thispinrequiresa10μFcapacitorconnectedtoAGNDpin.QMICR1615ANAOUTANCmicrophonepreamplifieroutputrightchannel.IOP1R1716ANAINANCfilterOpAmp1inputrightchannel.QOP1R1817ANAOUTANCfilterOpAmp1outputrightchannel.PinDescriptionAS3415/AS3435–6amsDatasheet,Confidential:2014-Feb[1-20]PinDescriptionIOP2R19-ANAINANCFilterOpAmp2inputrightchannel.QOP2R20-ANAOUTANCfilterOpAmp2outputrightchannel.BPL2118ANAINLeftaudiobypassterminalinput.HPL2219ANAOUTHeadphoneamplifieroutputleftchannelMIXL2320ANAINHeadphoneamplifierexternalsummationinputterminalleftchannel.MIXR2421ANAINHeadphoneamplifierexternalsummationinputterminalrightchannel.HPR2522ANAOUTHeadphoneamplifieroutputrightchannelBPR2623ANAOUTRightaudiobypassterminalinput.VBAT2724SUPINPositivesupplyterminalofIC.CPP2825ANAOUTVNEGchargepumpflyingcapacitorpositiveterminal.GND2926GNDVNEGchargepumpgroundterminal.CPN3027ANAOUTVNEGchargepumpflyingcapacitornegativeterminal.VNEG3128SUPOUTVNEGchargepumpoutput.ThispinmustbeconnectedtoexposedpadofQFNpackage.QOP2L32-ANAOUTANCFilterOpAmp2outputleftchannel