ICS41350 BottomPortPDMLowPowerMultiMode MicrophoneWithHighAOPMode GENERALDESCRIPTION APPLICATIONS TheICS41350isalowpower,lownoisedigitalMEMS microphoneinasmallpackage.TheICS41350consistsofa MEMSmicrophoneelementandanimpedanceconverter amplifierfollowedbyafourthordermodulator.Thepulse densitymodulated(PDM)interfaceallowstwomicrophones tobetimemultiplexedonadatalineusingasingleclock. TheICS41350hasmultiplemodesofoperation:High Performance,LowPower(AlwaysOn),StandardandSleep. TheICS41350haslowpowerandhighSNRinalloperational modes.Ithas126dBSPLAOPinHighPerformancemode,and 120dBSPLAOPinStandardandLowPowermodes. TheICS41350supportsultrasoundapplicationsinHigh PerformanceMode.Ithasanextendedultrasonicresponseupto 40kHzwithhighSNR. TheICS41350isavailableinasmall3.5x2.65x0.98mm surfacemountpackage.Itisreflowsoldercompatiblewith nosensitivitydegradation. Smartphones MicrophoneArrays Tablets Cameras BluetoothHeadsets NotebookPCs SecurityandSurveillance FEATURES SPEC LOWPOWER MODE STANDARD MODE HIGH PERFORMANCE MODE Sensitivity SNR Current AOP Clock -26dBFS1dB 63dBA 185A 120dBSPL 400-800kHz -26dBFS1dB 64dBA 430A 120dBSPL 1.0-3.3MHz -32dBFS1dB 64dBA 650A 126dBSPL 4.1-4.8MHz 3.5x2.65x0.98mmsurfacemountpackage Lowpower:185AinLowPowerMode Extendedfrequencyresponsefrom50Hzto>20kHz Ultrasoundsupportupto40kHz SleepMode:12A Highpowersupplyrejection(PSR):-97dBFS Fourthordermodulator Digitalpulsedensitymodulation(PDM)output CompatiblewithSn/PbandPbfreesolderprocesses RoHS/WEEEcompliant FUNCTIONALBLOCKDIAGRAM ORDERINGINFORMATION PART ICS41350 VDD GND POWER MANAGEMENT PDM MODULATOR DATA PACKAGING -40Cto+85C -- 13"TapeandReel InvenSensereservestherighttochangethedetail specificationsasmayberequiredtopermit improvementsinthedesignofitsproducts. CLK TEMPRANGE CHANNEL SELECT SELECT ADC ICS41350 EV_ICS41350FX InvenSenseInc. 1745TechnologyDrive,SanJose,CA95110U.S.A +1(408)988-7339 www.invensense.com DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 ICS41350 TABLEOFCONTENTS GeneralDescription.....................................................................................................................................................................1 Applications.................................................................................................................................................................................1 Features.......................................................................................................................................................................................1 FunctionalBlockDiagram............................................................................................................................................................1 OrderingInformation...................................................................................................................................................................1 TableofContents....................................................................................................................................................................................2 Specifications..........................................................................................................................................................................................4 Table1.Acoustical/ElectricalCharacteristics-General..............................................................................................................4 Table2.Acoustical/ElectricalCharacteristics-HighPerformanceMode...................................................................................4 Table3.Acoustical/ElectricalCharacteristics-StandardMode..................................................................................................5 Table4.Acoustical/ElectricalCharacteristics-LowPowerMode..............................................................................................5 Table5.DigitalInput/OutputCharacteristics..............................................................................................................................6 Table6.PDMDigitalInput/Output..............................................................................................................................................6 TimingDiagram............................................................................................................................................................................7 AbsoluteMaximumRatings....................................................................................................................................................................8 Table7.AbsoluteMaximumRatings...........................................................................................................................................8 ESDCaution.................................................................................................................................................................................8 SolderingProfile...........................................................................................................................................................................9 Table8.RecommendedSolderingProfile*..................................................................................................................................9 PinConfigurationsAndFunctionDescriptions.....................................................................................................................................10 Table9.PinFunctionDescriptions.............................................................................................................................................10 TypicalPerformanceCharacteristics.....................................................................................................................................................11 TheoryOfOperation.............................................................................................................................................................................12 PDMDataFormat......................................................................................................................................................................12 Table10.ICS41350ChannelSetting.........................................................................................................................................12 PDMMicrophoneSensitivity.....................................................................................................................................................12 ApplicationsInformation......................................................................................................................................................................14 LowPowerMode.......................................................................................................................................................................14 DynamicRangeConsiderations.................................................................................................................................................14 ConnectingPDMMicrophones..................................................................................................................................................14 UltrasoundApplications............................................................................................................................................................16 SleepMode................................................................................................................................................................................16 StartUpTime.............................................................................................................................................................................16 SupportingDocuments.........................................................................................................................................................................17 ApplicationNotes......................................................................................................................................................................17 PCBDesignAndLandPatternLayout...................................................................................................................................................18 PCBMaterialAndThickness......................................................................................................................................................18 HandlingInstructions............................................................................................................................................................................19 DocumentNumber:DS000047 Page2of22 Revision:1.1 RevDate:06/23/2016 ICS41350 PickAndPlaceEquipment.........................................................................................................................................................19 ReflowSolder.............................................................................................................................................................................19 BoardWash...............................................................................................................................................................................19 OutlineDimensions...............................................................................................................................................................................20 OrderingGuide..........................................................................................................................................................................20 RevisionHistory.........................................................................................................................................................................21 ComplianceDeclarationDisclaimer......................................................................................................................................................22 DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page3of22 ICS41350 SPECIFICATIONS TABLE1.ACOUSTICAL/ELECTRICALCHARACTERISTICS-GENERAL TA=25C,VDD=1.8to3.3V,SCK=2.4MHz,50xdecimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot guaranteed. PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES PERFORMANCE Directionality Omni OutputPolarity Inputacousticpressurevs. NonInverted outputdata SupplyVoltage(VDD) 1.65 3.63 V SleepModeCurrent(IS) SCK<200kHz 12 20 A TABLE2.ACOUSTICAL/ELECTRICALCHARACTERISTICS-HIGHPERFORMANCEMODE TA=25C,VDD=1.8to3.3V,SCK=4.8MHz,50xdecimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot guaranteed. PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES Sensitivity 1kHz,94dBSPL -33 -32 -31 dBFS 1,2 SignaltoNoiseRatio(SNR) 20kHzbandwidth,Aweighted 64 dBA EquivalentInputNoise(EIN) 20kHzbandwidth,Aweighted 30 dBASPL DynamicRange DerivedfromEINandAOP 96 dB Lowfrequency-3dBpoint 50 Hz 3 UltrasoundBandwidth 40 kHz TotalHarmonicDistortion(THD) 105dBSPL 0.2 1 % PowerSupplyRejection(PSR) 217Hz,100mVppsquarewave superimposedonVDD=1.8V,A -97 dBFS weighted PowerSupplyRejection--Swept 1kHzsinewave -100 dBFS Sine AcousticOverloadPoint 10%THD 126 dBSPL FullScaleAcousticLevel 0dBFSoutput 126 dBSPL SupplyCurrent(IS) VDD=1.8V,noload 650 750 A Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity. Note2:Thesensitivityshallnotdeviatemorethan1.0dBfromitsinitialvalueafterreliabilitytests. Note3:SeeFigure4. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page4of22 ICS41350 TABLE3.ACOUSTICAL/ELECTRICALCHARACTERISTICS-STANDARDMODE TA=25C,VDD=1.8to3.3V,SCK=2.4MHz,50xdecimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot guaranteed. PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES Sensitivity 1kHz,94dBSPL -27 -26 -25 dBFS 1,2 SignaltoNoiseRatio(SNR) 20kHzbandwidth,Aweighted 64 dBA EquivalentInputNoise(EIN) 20kHzbandwidth,Aweighted 30 dBASPL DynamicRange DerivedfromEINandAOP 90 dB Lowfrequency-3dBpoint 50 Hz 3 TotalHarmonicDistortion(THD) 105dBSPL 0.2 1 % PowerSupplyRejection(PSR) 217Hz,100mVppsquarewave superimposedonVDD=1.8V,A -97 dBFS weighted PowerSupplyRejection--Swept 1kHzsinewave -104 dBFS Sine AcousticOverloadPoint 10%THD 120 dBSPL FullScaleAcousticLevel 0dBFSoutput 120 dBSPL SupplyCurrent(IS) VDD=1.8V,noload 430 500 A Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity. Note2:Thesensitivityshallnotdeviatemorethan1.0dBfromitsinitialvalueafterreliabilitytests. Note3:SeeSeeFigure4. TABLE4.ACOUSTICAL/ELECTRICALCHARACTERISTICS-LOWPOWERMODE TA=25C,VDD=1.8to3.3V,SCK=768kHz,50xdecimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot guaranteed. PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES Sensitivity 1kHz,94dBSPL -27 -26 -25 dBFS 1,2 SignaltoNoiseRatio(SNR) 8kHzbandwidth,Aweighted 63 dBA EquivalentInputNoise(EIN) 8kHzbandwidth,Aweighted 31 dBASPL DynamicRange DerivedfromEINandAOP 89 dB Lowfrequency-3dBpoint 50 Hz 3 TotalHarmonicDistortion(THD) 105dBSPL 0.2 1 % PowerSupplyRejection(PSR) 217Hz,100mVppsquarewave superimposedonVDD=1.8V,A -97 dBFS weighted PowerSupplyRejection--Swept 1kHzsinewave -98 dBFS Sine AcousticOverloadPoint 10%THD 120 dBSPL FullScaleAcousticLevel 0dBFSoutput 120 dBSPL SupplyCurrent(IS) VDD=1.8V,noload 185 225 A Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity. Note2:Thesensitivityshallnotdeviatemorethan1.0dBfromitsinitialvalueafterreliabilitytests. Note3:SeeFigure4. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page5of22 ICS41350 TABLE5.DIGITALINPUT/OUTPUTCHARACTERISTICS TA=25C,1.8V<VDD<3.3V,unlessotherwisenoted. PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES InputVoltageHigh(VIH) 0.65xVDD V InputVoltageLow(VIL) 0.35xVDD V OutputVoltageHigh(VOH) ILOAD=0.5mA 0.7xVDD VDD V OutputVoltageLow(VOL) ILOAD=0.5mA 0 0.3xVDD V OutputDCOffset Latency Percentoffullscale 3 <30 % s TABLE6.PDMDIGITALINPUT/OUTPUT TA=25C,1.8V<VDD<3.3V,unlessotherwisenoted. PARAMETER CONDITIONS MIN TYP MAX UNITS NOTES MODESWITCHING SleepTime WakeUpTime WakeUpTime Switchingtime Switchingtime INPUT tCLKIN TimefromfCLKfalling<200kHz HighPerformance & Standard modes, Sleep Mode to fCLK >1 MHz, output within0.5dBoffinalsensitivity,power on LowPowerMode,SleepModetofCLK >400kHz,outputwithin0.5dBoffinal sensitivity,poweron BetweenLowPowerandStandard Modes BetweenLowPowerandHigh PerformanceModes ClockDutyCycle tRISE tFALL OUTPUT t1OUTEN t1OUTDIS t2OUTEN t2OUTDIS 1 ms 20 ms 20 ms 10 ms 10 ms 208 2500 ns 200 kHz LowPowerMode 400 800 kHz StandardMode 1.0 3.3 MHz HighPerformanceMode fCLK<3.3MHz fCLK>4.1MHz CLKrisetime(10%to90%level) CLKfalltime(90%to10%level) 4.1 4.8 40 48 60 52 25 25 MHz % % ns ns 1 1 DATA1(right)drivenafterfallingclock edge DATA1(right)disabledafterrising clockedge DATA2(left)drivenafterrisingclock edge DATA2(left)disabledafterfallingclock edge 50 ns ns ns ns Inputclockperiod 5 50 5 40 40 Note1:Guaranteedbydesign DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 SleepMode ClockFrequency(CLK) Page6of22 ICS41350 TIMINGDIAGRAM tCLKIN CLK tFALL tRISE t1OUTEN t1OUTDIS DATA1 t2OUTDIS DATA2 t2OUTEN Figure1.PulseDensityModulatedOutputTiming DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page7of22 ICS41350 ABSOLUTEMAXIMUMRATINGS StressabovethoselistedasAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly andfunctionaloperationofthedeviceattheseconditionsisnotimplied.Exposuretotheabsolutemaximumratingsconditionsfor extendedperiodsmayaffectdevicereliability. TABLE7.ABSOLUTEMAXIMUMRATINGS PARAMETER RATING -0.3Vto+3.63V SupplyVoltage(VDD) DigitalPinInputVoltage SoundPressureLevel -0.3VtoVDD+0.3Vor3.63V,whicheverisless 160dB MechanicalShock 10,000g Vibration PerMILSTD883Method2007,TestConditionB TemperatureRange Biased Storage -40Cto+85C -55Cto+150C ESDCAUTION ESD(electrostaticdischarge)sensitivedevice. Chargeddevicesandcircuitboardscan dischargewithoutdetection.Althoughthis productfeaturespatentedorproprietary protectioncircuitry,damagemayoccuron devicessubjectedtohighenergyESD. ThereforeproperESDprecautionsshouldbe takentoavoidperformancedegradationor lossoffunctionality. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page8of22 ICS41350 SOLDERINGPROFILE CRITICAL ZONE TL TO TP tP TP TEMPERATURE RAMP-UP TL tL TSMAX TSMIN tS RAMP-DOWN PREHEAT t25C TO PEAK TEMPERATURE TIME Figure2.RecommendedSolderingProfileLimits TABLE8.RECOMMENDEDSOLDERINGPROFILE* PROFILEFEATURE AverageRampRate(TLtoTP) Sn63/Pb37 1.25C/secmax PbFree 1.25C/secmax 100C 100C 150C 200C 60secto75sec 1.25C/sec 45secto75sec 183C 60secto75sec 1.25C/sec ~50sec 217C 215C+3C/-3C 260C+0C/-5C TimeWithin+5CofActualPeak Temperature(tP) 20secto30sec 20secto30sec RampDownRate 3C/secmax 3C/secmax MinimumTemperature (TSMIN) Maximum Preheat Temperature(TSMAX) Time(TSMINtoTSMAX),tS RampUpRate(TSMAXtoTL) TimeMaintainedAboveLiquidous(tL) LiquidousTemperature(TL) PeakTemperature(TP) Time+25C(t25C)toPeakTemperature 5minmax 5minmax *ThereflowprofileinTable8isrecommendedforboardmanufacturingwithInvenSenseMEMSmicrophones.Allmicrophonesare alsocompatiblewiththeJSTD020profile DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page9of22 ICS41350 PINCONFIGURATIONSANDFUNCTIONDESCRIPTIONS 3 SELECT 4 CLK GND 2 DATA 5 1 VDD Figure3.PinConfiguration(TopView,TerminalSideDown) TABLE9.PINFUNCTIONDESCRIPTIONS PIN NAME FUNCTION 1 DATA DigitalOutputSignal(DATA1orDATA2) 2 SELECT 3 GND LeftChannelorRightChannelSelect: DATA1(right):SELECTtiedtoGND DATA2(left):SELECTtiedtoVDD.Inthissetting,SELECTshouldbetiedtothesamevoltage sourceastheVDDpin. Ground 4 CLK ClockInputtoMicrophone 5 VDD PowerSupply.Forbestperformanceandtoavoidpotentialparasiticartifacts,placea0.1F (100nF)ceramictypeX7RcapacitorbetweenPin5(VDD)andground.Placethecapacitoras closetoPin5aspossible. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page10of22 ICS41350 TYPICALPERFORMANCECHARACTERISTICS LowPowerMode 20 HighPerformanceMode 10 10 StandardMode THD+N(%) NORMALIZEDAMPLITUDE(dB) 30 0 1 10 20 0.1 10 100 1000 90 10000 FREQUENCY(Hz) 100 110 120 130 INPUTAMPLITUDE(dBSPL) Figure4.TypicalFrequencyResponse Figure5.THD+Nvs.InputLevel 0 0 OUTPUTAMPLITUDE(dBFS) PSR(dBFS) 20 40 60 80 100 120 10 20 Standard&Low PowerModes 30 HighPerformance Mode 40 100 1000 10000 90 FREQUENCY(Hz) 100 110 120 Figure6.PowerSupplyRejection(PSR)vs.Frequency Figure7.Linearity DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 130 INPUTAMPLITUDE(dBSPL) Page11of22 ICS41350 THEORYOFOPERATION PDMDATAFORMAT TheoutputfromtheDATApinoftheICS41350isinpulsedensitymodulated(PDM)format.Thisdataisthe1bitoutputofafourth ordermodulator.ThedataisencodedsothattheleftchannelisclockedonthefallingedgeofCLK,andtherightchannelisclocked ontherisingedgeofCLK.AfterdrivingtheDATAsignalhighorlowintheappropriatehalfframeoftheCLKsignal,theDATAdriverof themicrophonetristates.Inthisway,twomicrophones,onesettotheleftchannelandtheothertotheright,candriveasingleDATA line.SeeFigure1foratimingdiagramofthePDMdataformat;theDATA1andDATA2linesshowninthisfigurearetwohalvesofthe singlephysicalDATAsignal.Figure8showsadiagramofthetwostereochannelssharingacommonDATAline. CLK DATA2 (L) DATA DATA1 (R) DATA2 (L) DATA1 (R) Figure8.StereoPDMFormat IfonlyonemicrophoneisconnectedtotheDATAsignal,theoutputisonlyclockedonasingleedge(Figure9).Forexample,aleft channelmicrophoneisneverclockedontherisingedgeofCLK.Inasinglemicrophoneapplication,eachbitoftheDATAsignalis typicallyheldforthefullCLKperioduntilthenexttransitionbecausetheleakageoftheDATAlineisnotenoughtodischargetheline whilethedriveristristated. CLK DATA DATA1 (R) DATA1 (R) DATA1 (R) Figure9.MonoPDMFormat SeeTable10forthechannelassignmentsaccordingtothelogiclevelontheSELECTpin. TABLE10.ICS41350CHANNELSETTING SELECTPinSetting Low(tietoGND) High(tietoVDD) Channel Right(DATA1) Left(DATA2) ForPDMdata,thedensityofthepulsesindicatesthesignalamplitude.Ahighdensityofhighpulsesindicatesasignalnearpositive fullscale,andahighdensityoflowpulsesindicatesasignalnearnegativefullscale.Aperfectzero(dc)audiosignalshowsan alternatingpatternofhighandlowpulses. TheoutputPDMdatasignalhasadcoffsetofabout3%offullscale.Ahighpassfilterinthecodecthatisconnectedtothedigital microphoneanddoesnotaffecttheperformanceofthemicrophonetypicallyremovesthisdcsignal. PDMMICROPHONESENSITIVITY ThesensitivityofaPDMoutputmicrophoneisspecifiedwiththeunitdBFS(decibelsrelativetodigitalfullscale).A0dBFSsine waveisdefinedasasignalwhosepeakjusttouchesthefullscalecodeofthedigitalword(seeFigure10).Thismeasurement conventionalsomeansthatsignalswithadifferentcrestfactormayhaveanRMSlevelhigherthan0dBFS.Forexample,afullscale squarewavehasanRMSlevelof3dBFS. Thisdefinitionofa0dBFSsignalmustbeunderstoodwhenmeasuringthesensitivityoftheICS41350.A1kHzsinewaveata 94dBSPLacousticinputtotheICS41350resultsinanoutputsignalwitha-26dBFSlevelinStandardModeand-32dBFSinHigh DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page12of22 ICS41350 PerformanceMode.IntheStandardModeexample,theoutputdigitalwordpeaksat-26dBbelowthedigitalfullscalelevel.A commonmisunderstandingisthattheoutputhasanRMSlevelof-29dBFS;however,thisisnottruebecauseofthedefinitionofthe 0dBFSsinewave. 1.0 0.8 DIGITAL AMPLITUDE (D) 0.6 0.4 0.2 0 -0.2 -0.4 -0.6 -0.8 -1.0 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 TIME (ms) 0.9 1.0 Figure10.1kHz,0dBFSSineWave Thereisnotacommonlyacceptedunitofmeasurementtoexpresstheinstantaneouslevel,asopposedtotheRMSlevelofthe signal,ofadigitalsignaloutputfromthemicrophone.Somemeasurementsystemsexpresstheinstantaneouslevelofanindividual sampleinunitsofD,where1.0Disdigitalfullscale.Inthiscase,a-26dBFSsinewavehaspeaksat0.05D. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page13of22 ICS41350 APPLICATIONSINFORMATION LOWPOWERMODE LowPowerMode(LPM)enablestheICS41350tobeusedinanAlwaysOnlisteningmodeforkeywordspottingandambientsound analysis.TheICS41350willenterLPMwhenthefrequencyofSCKisbetween400and800kHz.Inthismode,themicrophone consumesonly185Awhileretaininghighelectroacousticperformance. WhenonemicrophoneisinLPMforAlwaysOnlistening,asecondmicrophonesharingthesamedatalinemaybepowereddown.In thiscase,whereonemicrophoneispoweredupandanotherispowereddownbydisablingtheVDDsupplyorinsleepmodeby reducingthefrequencyofaseparateclocksource,thedisabledmicrophonedoesnotpresentaloadtothesignalontheLPM microphone'sDATApin. DYNAMICRANGECONSIDERATIONS Thefullscaledigitaloutput(0dBFS)oftheICS41350ismappedtoanacousticinputof126dBSPLinhighperformancemode.The microphoneclips(THD=10%)at126dBSPL(seeFigure5);however,itcontinuestooutputanincreasinglydistortedsignalabove thatpoint.Thepeakoutputlevel,whichiscontrolledbythemodulator,limitsat0dBFS(seeFigure7). Tofullyusethe96dBdynamicrangeoftheoutputdataoftheICS41350inadesign,thedigitalsignalprocessor(DSP),analogtodigital converter(ADC),orcodeccircuitfollowingitmustbechosencarefully.ThedecimationfilterthatinputsthePDMsignalfromtheICS 41350musthaveadynamicrangesufficientlybetterthanthedynamicrangeofthemicrophonesothattheoverallnoise performanceofthesystemisnotdegraded.Ifthedecimationfilterhasadynamicrangeof10dBbetterthanthemicrophone,the overallsystemnoiseonlydegradesby0.4dB.This106dBfilterdynamicrangerequiresthefiltertohaveatleast18bitresolution. CONNECTINGPDMMICROPHONES APDMoutputmicrophoneistypicallyconnectedtoacodecwithadedicatedPDMinput.Thiscodecseparatelydecodestheleftandright channelsandfiltersthehighsampleratemodulateddatabacktotheaudiofrequencyband.Thiscodecalsogeneratestheclockforthe PDMmicrophonesorissynchronouswiththesourcethatisgeneratingtheclock.Figure11andFigure12showmonoandstereo connectionsoftheICS41350toacodec.ThemonoconnectionshowsanICS41350settooutputdataontherightchannel.Tooutput ontheleftchannel,tietheSELECTpintoVDDinsteadoftyingittoGND. 1.8V TO 3.3V 0.1F CODEC VDD ICS41350 SELECT CLK DATA CLOCKOUTPUT DATAINPUT GND Figure11.MonoPDMMicrophone(RightChannel)ConnectiontoCodec DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page14of22 ICS41350 1.8V TO 3.3V 0.1F CODEC VDD CLK ICS41350 SELECT DATA CLOCKOUTPUT DATAINPUT GND 1.8V TO 3.3V 0.1F VDD ICS41350 SELECT CLK DATA GND Figure12.StereoPDMMicrophoneConnectiontoCodec DecoupletheVDDpinoftheICS41350toGNDwitha0.1Fcapacitor.PlacethiscapacitorasclosetoVDDastheprintedcircuitboard (PCB)layoutallows. DonotuseapulluporpulldownresistoronthePDMdatasignallinebecauseitcanpullthesignaltoanincorrectstateduringtheperiod thatthesignallineistristated. TheDATAsignaldoesnotneedtobebufferedinnormalusewhentheICS41350microphone(s)isplacedclosetothecodeconthePCB.If theDATAsignalmustbedrivenoveralongcable(>15cm)orotherlargecapacitiveload,adigitalbuffermayberequired.Onlyuseasignal bufferontheDATAlinewhenonemicrophoneisinuseorafterthepointwheretwomicrophonesareconnected(seeFigure13).The DATAoutputofeachmicrophoneinastereoconfigurationcannotbeindividuallybufferedbecausethetwobufferoutputscannot driveasinglesignalline.Ifabufferisused,takecaretoselectonewithlowpropagationdelaysothatthetimingofthedata connectedtothecodecisnotcorrupted. CODEC ICS41350 CLK CLOCKOUTPUT DATA DATAINPUT ICS41350 CLK DATA Figure13.BufferedConnectionsBetweenStereoICS41350sandaCodec DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page15of22 ICS41350 WhenlongwiresareusedtoconnectthecodectotheICS41350,asourceterminationresistorcanbeusedontheclockoutputofthe codecinsteadofabuffertominimizesignalovershootorringing.Matchthevalueofthisresistortothecharacteristicimpedanceof theCLKtraceonthePCB.Dependingonthedrivecapabilityofthecodecclockoutput,abuffermaystillbeneeded,asshowninFigure 13. ULTRASOUNDAPPLICATIONS InitsHighPerformanceMode,theICS41350functionsasanultrasonicsensor,aswellasanaudiobandsensor.Thismicrophone's ultrasonicperformancewilldependontheclockfrequency,thelowpassdecimationfilter,thestrengthoftheultrasonicsignalbeing sensed,andthedesignoftheacousticportthatiscoupledtothemicrophone.Theacousticportdesignisespeciallyimportantat higherfrequencies,becausethesizeoftheportitselfisontheorderof1/4thewavelengthofsoundandtheacousticmassloadingwill besignificant.Thesewillbothcontributetotheporthavingaconsiderableeffectontheacousticsystem'sresponse. SLEEPMODE Themicrophoneenterssleepmodewhentheclockfrequencyfallsbelow200kHz.Inthismode,themicrophonedataoutputisinahigh impedancestate.Thecurrentconsumptioninsleepmodeislessthan20A. TheICS41350enterssleepmodewithin1msoftheclockfrequencyfallingbelow200kHz.Themicrophonewakesupfromsleep modeandbeginstooutputdatawithin20msofwhentheclockbecomesactive. STARTUPTIME ThestartuptimeoftheICS41350islessthan20ms.ThePDMdatafromthemicrophoneisvalidtobeusedassoonasthedatais beingoutput. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page16of22 ICS41350 SUPPORTINGDOCUMENTS Foradditionalinformation,seethefollowingdocuments. APPLICATIONNOTES AN000048,PDMDigitalOutputMEMSMicrophoneFlexEvaluationBoardUserGuide AN100,MEMSMicrophoneHandlingandAssemblyGuide AN1003,RecommendationsforMountingandConnectingtheInvensense,BottomPortedMEMSMicrophones AN1112,MicrophoneSpecificationsExplained AN1124,RecommendationsforSealingInvenSenseBottomPortMEMSMicrophonesfromDustandLiquidIngress AN1140,MicrophoneArrayBeamforming DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page17of22 ICS41350 PCBDESIGNANDLANDPATTERNLAYOUT TherecommendedPCBlandpatternfortheICS41350isa1:1ratioofthesolderpadsonthemicrophonepackage,asshowninFigure 14.AvoidapplyingsolderpastetothesoundholeinthePCB.AsuggestedsolderpastestencilpatternlayoutisshowninFigure15. TheresponseoftheICS41350isnotaffectedbythePCBholesizeaslongastheholeisnotsmallerthanthesoundportofthe microphone(0.375mmindiameter).A0.5mmto1mmdiameterfortheholeisrecommended.Takecaretoaligntheholeinthe microphonepackagewiththeholeinthePCB.Theexactdegreeofthealignmentdoesnotaffectthemicrophoneperformanceaslong astheholesarenotpartiallyorcompletelyblocked. 0.522x0.725(4X) O1.625 O1.025 1.675 0.838 0.822 1.252 Figure14.RecommendedPCBLandPatternLayout 0.422x0.625(4X) O1.625 O1.125 1.675 0.1(4x) 0.822 1.252 Figure15.SuggestedSolderPasteStencilPatternLayout PCBMATERIALANDTHICKNESS TheperformanceoftheICS41350isnotaffectedbyPCBthickness.TheICS41350canbemountedoneitherarigidorflexiblePCB. AflexiblePCBwiththemicrophonecanbeattacheddirectlytothedevicehousingwithanadhesivelayer.Thismountingmethod offersareliablesealaroundthesoundportwhileprovidingtheshortestacousticpathforgoodsoundquality. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page18of22 ICS41350 HANDLINGINSTRUCTIONS PICKANDPLACEEQUIPMENT TheMEMSmicrophonecanbehandledusingstandardpickandplaceandchipshootingequipment.Takecaretoavoiddamagetothe MEMSmicrophonestructureasfollows: Useastandardpickuptooltohandlethemicrophone.Becausethemicrophoneholeisonthebottomofthepackage,the pickuptoolcanmakecontactwithanypartofthelidsurface. Donotpickupthemicrophonewithavacuumtoolthatmakescontactwiththebottomsideofthemicrophone. Donotpullairoutoforblowairintothemicrophoneport. DonotuseexcessiveforcetoplacethemicrophoneonthePCB. REFLOWSOLDER Forbestresults,thesolderingprofilemustbeinaccordancewiththerecommendationsofthemanufacturerofthesolderpasteusedto attachtheMEMSmicrophonetothePCB.Itisrecommendedthatthesolderreflowprofilenotexceedthelimitconditionsspecified inFigure2andTable8. BOARDWASH WhenwashingthePCB,ensurethatwaterdoesnotmakecontactwiththemicrophoneport.Donotuseblowoffproceduresor ultrasoniccleaning. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page19of22 ICS41350 OUTLINEDIMENSIONS d 3.50 (4X) 0.10 0.522X0.725(4x) j 0.10 m C A B A PIN1 CORNER 0.125 PIN1 CORNER 0.82 O1.625 O1.025 (2.45) 2.65 2.650 1 2 5 4 O0.375 0.950 1.675 1.33 3 0.300 0.125 B (3.30) 1.040 1.513 3.500 BOTTOMVIEW TOPVIEW f 0.10 C 0.98 (0.254) SIDEVIEW C Figure16.5TerminalChipArraySmallOutlineNoLeadCavity[LGA_CAV] 3.5mmx2.65mmx0.98mmBody Dimensionsshowninmillimeters Dimensiontoleranceis0.15mmunlessotherwisespecified PIN1INDICATION PARTNUMBER 350 YYXXX DATE CODE LOTTRACEABILITY CODE Figure17.PackageMarkingSpecification(TopView) ORDERINGGUIDE PART ICS41350 TEMPRANGE PACKAGE -40Cto+85C 5TerminalLGA_CAV QUANTITY 10,000 PACKAGING 13"TapeandReel EV_ICS41350FX -- -- DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 EvaluationBoard Page20of22 ICS41350 REVISIONHISTORY REVISIONDATE REVISION DESCRIPTION 2/4/2016 1.0 Initialversion 6/23/2016 1.1 UpdatedOrderingGuidequantity DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page21of22 ICS41350 COMPLIANCEDECLARATIONDISCLAIMER InvenSensebelievestheenvironmentalandothercomplianceinformationgiveninthisdocumenttobecorrectbutcannot guaranteeaccuracyorcompleteness.Conformitydocumentssubstantiatingthespecificationsandcomponentcharacteristicsareon file.InvenSensesubcontractsmanufacturing,andtheinformationcontainedhereinisbasedondatareceivedfromvendorsand suppliers,whichhasnotbeenvalidatedbyInvenSense. 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(c)2016InvenSense,Inc.Allrightsreserved. DocumentNumber:DS000047 Revision:1.1 RevDate:06/23/2016 Page22of22