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ICS-43434
Multi-ModeMicrophonewithI2SDigitalOutput
InvenSensereservestherighttochangethedetailspecificationsasmayberequiredtopermitimprovementsinthedesignofitsproducts.
InvenSenseInc.1745TechnologyDrive,SanJose,CA95110U.S.A
+1(408)988–7339www.invensense.com
DocumentNumber:DS-000069Revision:1.2ReleaseDate:08/29/2016
GENERALDESCRIPTIONTheICS-43434isdigitalI2Soutputbottomportmicrophone.ThecompleteICS-43434solutionconsistsofaMEMSsensor,signalconditioning,ananalog-to-digitalconverter,decimationandantialiasingfilters,powermanagement,andanindustrystandard24-bitI²Sinterface.TheI²SinterfaceallowstheICS-43434toconnectdirectlytodigitalprocessors,suchasDSPsandmicrocontrollers,withouttheneedforanaudiocodecinthesystem.TheICS-43434hasmultiplemodesofoperation:HighPerformance,LowPower(AlwaysOn)andSleep.TheICS-43434hashighSNRand120dBSPLAOPinalloperationalmodes.TheICS-43434hasahighSNRof65dBAandawidebandfrequencyresponse.ThesensitivitytoleranceoftheICS-43434is±1dB,whichenableshigh-performancemicrophonearrayswithouttheneedforsystemcalibration.TheICS-43434isavailableinasmall3.50mm×2.65mm×0.98mmsurface-mountpackage.TheICS-43434isfunction-compatiblewiththeICS-43432whileprovidingequivalentelectro-acousticperformanceatlowerpowerconsumptionandinasmallerpackage.
APPLICATIONS• Wearables• SmartTelevisions• RemoteControls• IoTDevices• TeleconferencingSystems• GamingConsoles• SecuritySystems
FEATURESSPEC HIGHPERFORMANCE
MODELOW-POWER
MODESensitivity −26dBFS±1dB −26dBFS±1dB
SNR 65dBA 64dBACurrent 490µA 230µAAOP 120dBSPL 120dBSPL
SampleRate 23–51.6kHz 6.25–18.75kHz
• DigitalI²Sinterfacewithhighprecision24-bitdata• Widefrequencyresponsefrom60Hzto20kHz• Highpowersupplyrejection:−100dBFS• Small3.50mm×2.65mm×0.98mmsurface-mount
package• CompatiblewithSn/PbandPb-freesolderprocesses• RoHS/WEEEcompliant
FUNCTIONALBLOCKDIAGRAM
ORDERINGINFORMATION
PART TEMPRANGE PACKAGINGICS-43434 −40°Cto+85°C 13”Tape&ReelEV_ICS-43434-FX —
ICS-43434
ADCFILTER
HARDWARECONTROL
I2SSERIALPORTPOWER
MANAGEMENT
SCK
SD
WS
VDD
GND LR
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TABLEOFCONTENTSGeneralDescription.....................................................................................................................................................................1Applications..................................................................................................................................................................................1Features.......................................................................................................................................................................................1FunctionalBlockDiagram.............................................................................................................................................................1OrderingInformation...................................................................................................................................................................1
TableofContents....................................................................................................................................................................................2Specifications..........................................................................................................................................................................................4
Table1.Acoustical/ElectricalCharacteristics–General..............................................................................................................4Table2.Acoustical/ElectricalCharacteristics–High-PerformanceMode...................................................................................4Table3.Acoustical/ElectricalCharacteristics–Low-PowerMode..............................................................................................5Table4.DigitalFilterCharacteristics............................................................................................................................................5Table5.I²SDigitalINPUT/Output................................................................................................................................................6TimingDiagram............................................................................................................................................................................7
AbsoluteMaximumRatings....................................................................................................................................................................8Table6.AbsoluteMaximumRatings............................................................................................................................................8ESDCaution..................................................................................................................................................................................8SolderingProfile...........................................................................................................................................................................9Table7.RecommendedSolderingProfile....................................................................................................................................9
PinConfigurationsAndFunctionDescriptions......................................................................................................................................10Table8.PinFunctionDescriptions.............................................................................................................................................10
TypicalPerformanceCharacteristics.....................................................................................................................................................11TheoryofOperation..............................................................................................................................................................................12
PowerManagement...................................................................................................................................................................12StartupandNormalOperation.......................................................................................................................................12StandbyMode.................................................................................................................................................................12
SynchronizingMicrophones.......................................................................................................................................................12I²SDataInterface.......................................................................................................................................................................12
DataOutputMode..........................................................................................................................................................12DataWordLength...........................................................................................................................................................12DataWordFormat..........................................................................................................................................................12DataOutputFormat........................................................................................................................................................13
DigitalMicrophoneSensitivity...................................................................................................................................................13DigitalFilterCharacteristics.......................................................................................................................................................14
High-PassFilter...............................................................................................................................................................14Low-PassDecimationFilter.............................................................................................................................................14
ApplicationsInformation.......................................................................................................................................................................15Low-PowerMode.......................................................................................................................................................................15
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SleepMode................................................................................................................................................................................15SDOutputDriveStrength...........................................................................................................................................................15PowerSupplyDecoupling..........................................................................................................................................................15
SupportingDocuments..........................................................................................................................................................................16EvaluationBoardUserGuide.....................................................................................................................................................16ApplicationNotes.......................................................................................................................................................................16
PCBDesignAndLandPatternLayout....................................................................................................................................................17PCBMaterialAndThickness.......................................................................................................................................................17
HandlingInstructions............................................................................................................................................................................18PickAndPlaceEquipment..........................................................................................................................................................18ReflowSolder.............................................................................................................................................................................18BoardWash................................................................................................................................................................................18
OutlineDimensions...............................................................................................................................................................................19OrderingGuide...........................................................................................................................................................................19RevisionHistory..........................................................................................................................................................................20
ComplianceDeclarationDisclaimer......................................................................................................................................................21
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SPECIFICATIONSTABLE1.ACOUSTICAL/ELECTRICALCHARACTERISTICS–GENERALTA=25°C,VDD=1.8to3.3V,fS=48kHz,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenotguaranteed.PARAMETER CONDITIONS MIN TYP MAX UNITS NOTESPERFORMANCEDirectionality Omni OutputPolarity Inputacousticpressurevs.
outputdata Non-Inverted
SupplyVoltage(VDD) 1.65 3.63 V SleepModeCurrent(IS) fS<3.125kHz 12 20 µA
TABLE2.ACOUSTICAL/ELECTRICALCHARACTERISTICS–HIGH-PERFORMANCEMODETA=25°C,VDD=1.8to3.3V,fS=48kHz,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenotguaranteed.PARAMETER CONDITIONS MIN TYP MAX UNITS NOTESSensitivity 1kHz,94dBSPL −27 −26 −25 dBFS 1Signal-to-NoiseRatio(SNR) 20kHzbandwidth,A-weighted 65 dBA EquivalentInputNoise(EIN) 20kHzbandwidth,A-weighted 29 dBASPL DynamicRange DerivedfromEINandacoustic
overloadpoint 91 dB
TotalHarmonicDistortion(THD) 105dBSPL 0.2 1 % PowerSupplyRejection(PSR) 217Hz,100mVp-psquarewave
superimposedonVDD=1.8V,A-weighted
−99 dBFS
PowerSupplyRejection—SweptSine
1kHzsinewave,VDD=1.8V −106 dBFS
AcousticOverloadPoint 10%THD 120 dBSPL
NoiseFloor 20Hzto20kHz,A-weighted,rms −90 dBFS
SupplyCurrent(IS) VDD=1.8V,noload 490 550 µA Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity.
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TABLE3.ACOUSTICAL/ELECTRICALCHARACTERISTICS–LOW-POWERMODETA=25°C,VDD=1.8to3.3V,fS=16kHz,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenotguaranteed.PARAMETER CONDITIONS MIN TYP MAX UNITS NOTESSensitivity 1kHz,94dBSPL −27 −26 −25 dBFS 1Signal-to-NoiseRatio(SNR) 20kHzbandwidth,A-weighted 64 dBA EquivalentInputNoise(EIN) 20kHzbandwidth,A-weighted 30 dBASPL DynamicRange DerivedfromEINandacoustic
overloadpoint 90 dB
TotalHarmonicDistortion(THD) 105dBSPL 0.2 1 % PowerSupplyRejection(PSR) 217Hz,100mVp-psquarewave
superimposedonVDD=1.8V,A-weighted
−98 dBFS
PowerSupplyRejection—SweptSine
1kHzsinewave,VDD=1.8V −100 dBFS
AcousticOverloadPoint 10%THD 120 dBSPL
NoiseFloor 20kHzbandwidth,A-weighted,rms −90 dBFS
SupplyCurrent(IS) VDD=1.8V,noload 230 300 µA Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity.
TABLE4.DIGITALFILTERCHARACTERISTICSPARAMETER CONDITIONS MIN TYP MAX UNITS NOTES
GroupDelayAcousticinputtodigitaloutput–includesfilterandI2Sserialoutput
2/fS sec.
PassBandRipple ±0.3 dB StopBandAttenuation 58 dB PassBand fs=48kHz 20 kHz
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TABLE5.I²SDIGITALINPUT/OUTPUT–40°C<TA<+85°C,1.8V<VDD<3.3V,unlessotherwisenoted.
PARAMETER CONDITIONS MIN MAX UNITS NOTESMODESWITCHINGSleepTime TimefromfSfalling
<3.125kHz 1 ms
Wake-UpTime High-Performancemode,SleepModetofWS>21.875kHz,outputwithin1dBoffinalsensitivity,poweron
20 ms
Wake-UpTime Low-PowerMode,SleepModetofWS>6.25kHz,outputwithin1dBoffinalsensitivity,poweron
20 ms
Switchingtime BetweenLow-PowerandHigh-PerformanceModes 10 ms
INPUT/OUTPUTSCKperiod(tSCP) Inputclockperiod 303 2500 ns SamplingFrequency(fS) SleepMode 3.125 kHz
Low-PowerMode 6.25 18.75 kHz High-PerformanceMode 23 51.6 kHz
SCKhigh(tSCH) 50 ns SCKlow(tSCL) 50 ns WSsetup(tWSS) 0 ns WShold(tWSH) 20 ns SCKDutyCycle 40 60 %
SDDataValid(tSDV)FromSCKfallingtovalidSDdata
75 ns
SDDataDisable(tSDD)FromSCKfallingtoSDoutputtristated
76 ns
tRISESCKrisetime(10%to90%level)
25 ns 1
tFALLSCKfalltime(90%to10%level)
25 ns 1
DIGITALINPUTVoltageInputLow(VIL) 0 0.3×VDD V
VoltageInputHigh(VIH) 0.7×VDD VDD V
SDDIGITALOUTPUTVoltageOutputLow(VOL) 0 0.35×VDD V
VoltageOutputHigh(VOH) 0.65×VDD VDD V
MaximumLoad fS=48kHz 85 pF Note 1: Guaranteed by design
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TIMINGDIAGRAM
Figure1.SerialDataPortTiming
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ABSOLUTEMAXIMUMRATINGSStressabovethoselistedasAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonlyandfunctionaloperationofthedeviceattheseconditionsisnotimplied.Exposuretotheabsolutemaximumratingsconditionsforextendedperiodsmayaffectdevicereliability.TABLE6.ABSOLUTEMAXIMUMRATINGS
PARAMETER RATING
SupplyVoltage(VDD) −0.3Vto+3.63V
DigitalPinInputVoltage −0.3VtoVDD+0.3Vor3.63V,whicheverisless
SoundPressureLevel 160dB
MechanicalShock 10,000g
Vibration PerMIL-STD-883Method2007,TestConditionB
TemperatureRange
Biased −40°Cto+85°C
Storage −55°Cto+150°C
ESDCAUTION
ESD(electrostaticdischarge)sensitivedevice.Chargeddevicesandcircuitboardscandischargewithoutdetection.Althoughthisproductfeaturespatentedorproprietaryprotectioncircuitry,damagemayoccurondevicessubjectedtohighenergyESD.ThereforeproperESDprecautionsshouldbetakentoavoidperformancedegradationorlossoffunctionality.
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SOLDERINGPROFILE
Figure2.RecommendedSolderingProfileLimits
TABLE7.RECOMMENDEDSOLDERINGPROFILE
PROFILEFEATURE Sn63/Pb37 Pb-FreeAverageRampRate(TLtoTP) 1.25°C/secmax 1.25°C/secmax
Preheat
MinimumTemperature(TSMIN)
100°C 100°C
MinimumTemperature(TSMIN)
150°C 200°C
Time(TSMINtoTSMAX),tS 60secto75sec 60secto75secRamp-UpRate(TSMAXtoTL) 1.25°C/sec 1.25°C/secTimeMaintainedAboveLiquidous(tL) 45secto75sec ~50secLiquidousTemperature(TL) 183°C 217°CPeakTemperature(TP) 215°C+3°C/−3°C 260°C+0°C/−5°CTimeWithin+5°CofActualPeakTemperature(tP)
20secto30sec 20secto30sec
Ramp-DownRate 3°C/secmax 3°C/secmax
Time+25°C(t25°C)toPeakTemperature 5minmax 5minmax
*ThereflowprofileinTable7isrecommendedforboardmanufacturingwithInvenSenseMEMSmicrophones.AllmicrophonesarealsocompatiblewiththeJ-STD-020profile
tP
tL
t25°C TO PEAK TEMPERATURE
tSPREHEAT
CRITICAL ZONETL TO TP
TEM
PER
ATUR
E
TIME
RAMP-DOWN
RAMP-UP
TSMIN
TSMAX
TP
TL
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PINCONFIGURATIONSANDFUNCTIONDESCRIPTIONS
Figure3.PinConfiguration(topview,terminalsidedown)
TABLE8.PINFUNCTIONDESCRIPTIONS
PIN NAME TYPE FUNCTION
1 WS Input SerialData-WordSelectforI²SInterface.
Thispinincludesaninternal100kΩpull-downresistor.IfthepinispulledtoVDDin
standbymode,thenVDD/100kΩcurrentwillsinkthroughthepin.2 LR Input Left/Rightchannelselect.Whensetlow,themicrophoneoutputsitssignalintheleft
channeloftheI²Sframe.Whensethigh,themicrophoneoutputsitssignalintherightchannel.
3 GND Ground Ground.ConnecttogroundonthePCB.
4 SCK Input SerialDataClockforI²SInterface.5 VDD Power Power,1.65to3.63V.ThispinshouldbedecoupledtoGNDwitha0.1μFcapacitor.
6 SD Output SerialDataOutputforI²SInterface.Thispintristateswhennotactivelydrivingtheappropriateoutputchannel.TheSDtraceshouldhavea100kΩpull-downresistortodischargethelineduringthetimethatallmicrophonesonthebushavetristatedtheiroutputs.
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TYPICALPERFORMANCECHARACTERISTICS
Figure4.TypicalFrequencyResponse(Measured)
Figure5.TotalHarmonicDistortion+Noise(THD+N)vs.InputSPL
Figure6.PSRvs.Frequency,100mVp-pSweptSineWave
Figure7.Linearity
-30
-20
-10
0
10
20
30
10 100 1000 10000
NORM
ALIZED
AMPLITUDE
(dB)
FREQUENCY(Hz)
0.01
0.1
1
10
90 100 110 120 130
THD+
N(%
)
INPUTAMPLITUDE(dBSPL)
LOW-POWERMODE
HIGH-PERFORMANCEMODE
-120
-100
-80
-60
-40
-20
0
100 1,000 10,000
PSR(dBFS)
FREQUENCY(Hz)
LOW-POWERMODE
HIGH-PERFORMANCEMODE
-40
-30
-20
-10
0
90 100 110 120
OUTPUTAM
PLITUDE
(dBFS)
INPUTAMPLITUDE(dBSPL)
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THEORYOFOPERATIONPOWERMANAGEMENTTheICS-43434hasthreepowerstates:high-performancemode,low-powermodeandstandbymode.StartupandNormalOperationThestart-uptimeoftheICS-43434islessthan20ms.TheI2Sdatafromthemicrophoneisvalidtobeusedassoonasthedataisbeingoutput.Thepartisinnormaloperation(high-performanceandlow-powermodes)whenSCKandWSareactive.StandbyModeThemicrophoneentersstandbymodewhenthefrequencyofSCKfallsbelowabout200kHz.ItisrecommendedtoenterstandbymodebystoppingboththeSCKandWSclocksignalsandpullingthosesignalstogroundtoavoiddrawingcurrentthroughtheWSpin’sinternalpull-downresistor.Thetimingforexitingstandbymodeisthesameasnormalstartup.Itisnotrecommendedtosupplyactiveclocks(WSandSCK)totheICS-43434whilethereisnopowersuppliedtoVDD.DoingthiscontinuouslyturnsonESDprotectiondiodes,whichmayaffectlong-termreliabilityofthemicrophone.SYNCHRONIZINGMICROPHONESStereoICS-43434microphonesaresynchronizedbytheWSsignal,soaudiocapturedfromtwomicrophonessharingthesameclockwillbeinsync.ThetwomicrophoneswillsynchronouslysampletheacousticsignalsatthebeginningoftheI2Sframe(WSfallingedge).I²SDATAINTERFACETheslaveserialdataport’sformatisI²S,24-bit,twoscomplement.Theremustbe64SCKcyclesineachWSstereoframe.TheLRcontrolpindetermineswhethertheICS-43434outputsdataintheleftorrightchannel.Whensettotheleftchannel,thedatawillbeoutputfollowingWS’sfallingedgeandwhensettooutputontherightchannel,datawillbeoutputfollowingWS’srisingedge.Forastereoapplication,theSDpinsoftheleftandrightICS-43434microphonesshouldbetiedtogetherasshowninFigure8.TheformatofastereoI²SdatastreamisshowninFigure9.Figure10andFigure11showtheformatsofamonomicrophonedatastreamforleftandrightmicrophones,respectively.DataOutputModeTheoutputdatapin(SD)istristatedwhenitisnotactivelydrivingI²Soutputdata.SDimmediatelytristatesaftertheLSBisoutputsothatanothermicrophonecandrivethecommondataline.TheSDtraceshouldhaveapull-downresistortodischargethelineduringthetimethatallmicrophonesonthebushavetristatedtheiroutputs.A100kΩresistorissufficientforthis,asshowninFigure8.IftheSDlineneedstobedischargedfasterthana100kΩresistorcan,asmallerresistor,suchas10kΩ,canbeused.DataWordLengthTheoutputdatawordlengthis24bitsperchannel.DataWordFormatThedefaultdataformatisI²S(twoscomplement),MSB-first.Inthisformat,theMSBofeachwordisdelayedbyoneSCKcyclefromthestartofeachhalf-frame.
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Figure8.SystemBlockDiagram
Figure9.StereoOutputI²SFormat
Figure10.MonoOutputI²SFormatLeftChannel(LR=0)
Figure11.MonoOutputI²SFormatRightChannel(LR=1)
DataOutputFormatTheoutputdatawordlengthis24bits/channel.Thedatawordformatis2’scomplement,MSB-first.Theoutputdatapin(SD)istri-statedwhenitisnotactivelydrivingoutputdata.SDwillimmediatelytri-stateaftertheLSBisoutputsothatanothermicrophonecandrivethecommondataline.DIGITALMICROPHONESENSITIVITYThesensitivityofadigitaloutputmicrophoneisspecifiedinunitsofdBFS(decibelsrelativetoafull-scaledigitaloutput).A0dBFSsinewaveisdefinedasasignalwhosepeakjusttouchesthefull-scalecodeofthedigitalword(seeFigure5).ThismeasurementconventionmeansthatsignalswithadifferentcrestfactormayhaveanRMSlevelhigherthan0dBFS.Forexample,afull-scalesquarewavehasanRMSlevelof3dBFS.
SCK
WS
SD
SYSTEM MASTER(DSP, MICROCONTROLLER,
CODEC)
SCK
WS
SD
VDD
LEFTICS-43434
GND
0.1µF
FROM VOLTAGEREGUL ATOR(1.8VTO 3.3V)
LRSCK
WS
SD
VDD
RIGHTICS-43434
GND
0.1µF
100kΩ
VDD
LR
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Figure11.1kHz,0dBFSSineWave
Thedefinitionofa0dBFSsignalmustbeunderstoodwhenmeasuringthesensitivityoftheICS-43434.Anacousticinputsignalofa1kHzsinewaveat94dBSPLappliedtotheICS-43434resultsinanoutputsignalwitha−26dBFSlevel.Thismeansthattheoutputdigitalwordpeaksat−26dBbelowthedigitalfull-scalelevel.AcommonmisunderstandingisthattheoutputhasanRMSlevelof−29dBFS;however,thisisnotthecasebecauseofthedefinitionofa0dBFSsinewave.Thereisnocommonlyacceptedunitofmeasurementtoexpresstheinstantaneouslevelofadigitalsignaloutputfromthemicrophone,asopposedtotheRMSlevelofthesignal.SomemeasurementsystemsexpresstheinstantaneouslevelofanindividualsampleinunitsofD,where1.0Disdigitalfullscale(seeFigure11).Inthiscase,a−26dBFSsinewavehaspeaksat0.05D.Formoreinformationaboutdigitalmicrophonesensitivity,seetheAN-1112ApplicationNote,MicrophoneSpecificationsExplained.DIGITALFILTERCHARACTERISTICSTheICS-43434hasaninternaldigitalbandpassfilter.Ahigh-passfiltereliminatesunwantedlowfrequencysignals.Alow-passdecimationfilterscalesthepassbandwiththesamplingfrequencyandperformsrequiredout-of-bandnoisereduction.High-PassFilterTheICS-43434incorporatesahigh-passfiltertoremoveDCandlowfrequencycomponents.Thishighpassfilterhasa−3dBcornerfrequencyof24Hzanddoesnotscalewiththesamplingrate.Low-PassDecimationFilterTheanalog-to-digitalconverterintheICS-43434isasingle-bit,highorder,sigma-delta(Σ-Δ)runningatahighoversamplingratio.Thenoiseshapingoftheconverterpushesthemajorityofthenoisewellabovetheaudiobandandgivesthemicrophoneawidedynamicrange.However,itdoesrequireagoodqualitylow-passdecimationfiltertoeliminatethehighfrequencynoise.Thepassbandofthefilterextendsto0.417×fSand,inthatband,hasonly±0.3dBofripple.A48kHzsamplingrateresultsinapassbandof20kHzandahalfamplitudecornerat24kHz;thestop-bandattenuationofthefilteris58dB.Notethatthesefilterspecificationsscalewithsamplingfrequency.
1.0
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
0 0.9 1.00.80.70.60.50.40.30.20.1
DIG
ITAL
AM
PLIT
UDE
(D)
TIME (ms)
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APPLICATIONSINFORMATIONLOW-POWERMODELowPowerMode(LPM)enablestheICS-43434tobeusedinanAlwaysOnlisteningmodeforkeywordspottingandambientsoundanalysis.TheICS-43434willenterLPMwhenthesamplingfrequencyisbetween6.25and18.75kHz.Inthismode,themicrophoneconsumesonly230µAwhileretaininghighelectro-acousticperformance.WhenonemicrophoneisinLPMforAlwaysOnlistening,asecondmicrophonesharingthesamedatalinemaybepowereddown.Inthiscase,whereonemicrophoneispoweredupandanotherispowereddownbydisablingtheVDDsupplyorinsleepmodebyreducingthefrequencyofaseparateclocksource,thedisabledmicrophonedoesnotpresentaloadtothesignalontheLPMmicrophone’sDATApin.SLEEPMODEThemicrophoneenterssleepmodewhenthesamplingfrequencyfallsbelow3.125kHz.Inthismode,themicrophonedataoutputisinahighimpedancestate.Thecurrentconsumptioninsleepmodeis12µA.TheICS-43434enterssleepmodewithin1msofthesamplingfrequencyfallingbelow3.125kHz.Themicrophonewakesupfromsleepmodeandbeginstooutputdata32,768SCKcyclesaftertheclockbecomesactive.Fora3.072MHzclock(fS=48kHz),themicrophonestartstooutputdatain10.7ms.Fora2.4MHzclock(fS=37.5kHz),themicrophonestartstooutputdatain13.7ms.Thewake-uptime(Table5)indicatesthetimefromwhentheclockisenabledtowhentheICS-43434outputsdatawithin1dBofitssettledsensitivity.SDOUTPUTDRIVESTRENGTHTheSDdataoutputpinmustdrivealoadthatincludesthePCBtraceandthetri-statedinputsoftheotherICS-43434SDpinsconnectedtothatsametrace.Thetri-statedloadcapacitanceoftheICS-43434SDpinisabout6pF.TheICS-43434hasbeendesignedtodrivealoadof85pF.POWERSUPPLYDECOUPLINGForbestperformanceandtoavoidpotentialparasiticartifacts,placinga0.1µFceramictypeX7RorbettercapacitorbetweenPin5(VDD)andgroundisstronglyrecommended.ThecapacitorshouldbeplacedasclosetoPin3aspossible.Theconnectionstoeachsideofthecapacitorshouldbeasshortaspossible,andthetraceshouldstayonasinglelayerwithnovias.Formaximumeffectiveness,locatethecapacitorequidistantfromthepowerandgroundpinsor,whenequidistantplacementisnotpossible,slightlyclosertothepowerpin.Thermalconnectionstothegroundplanesshouldbemadeonthefarsideofthecapacitor,asshowninFigure12.
Figure12.RecommendedPowerSupplyBypassCapacitorLayout
VDD GND
TOGND
TOVDD
CAPACITOR
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SUPPORTINGDOCUMENTSForadditionalinformation,seethefollowingdocuments.EVALUATIONBOARDUSERGUIDEAN-000088,Bottom-PortI2SOutputMEMSMicrophoneEvaluationBoardAPPLICATIONNOTESAN-100,MEMSMicrophoneHandlingandAssemblyGuideAN-1003,RecommendationsforMountingandConnectingtheInvenSenseBottom-PortedMEMSMicrophonesAN-1112,MicrophoneSpecificationsExplainedAN-1124,RecommendationsforSealingInvenSenseBottom-PortMEMSMicrophonesfromDustandLiquidIngressAN-1140,MicrophoneArrayBeamforming
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PCBDESIGNANDLANDPATTERNLAYOUTTherecommendedPCBlandpatternfortheICS-43434shouldbelaidouttoa1:1ratiotothesolderpadsonthemicrophonepackage,asshowninFigure13.TakecaretoavoidapplyingsolderpastetothesoundholeinthePCB.AsuggestedsolderpastestencilpatternlayoutisshowninFigure14.ThediameterofthesoundholeinthePCBshouldbelargerthanthediameterofthesoundportofthemicrophone.Aminimumdiameterof0.5mmisrecommended.
Figure13.PCBLandPatternLayout
Dimensionsshowninmillimeters
Figure14.SuggestedSolderPasteStencilPatternLayout
Dimensionsshowninmillimeters
PCBMATERIALANDTHICKNESSTheperformanceoftheICS-43434isnotaffectedbyPCBthickness.TheICS-43434canbemountedoneitherarigidorflexiblePCB.AflexiblePCBwiththemicrophonecanbeattacheddirectlytothedevicehousingwithanadhesivelayer.Thismountingmethodoffersareliablesealaroundthesoundportwhileprovidingtheshortestacousticpathforgoodsoundquality.
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HANDLINGINSTRUCTIONS PICKANDPLACEEQUIPMENTTheMEMSmicrophonecanbehandledusingstandardpick-and-placeandchipshootingequipment.TakecaretoavoiddamagetotheMEMSmicrophonestructureasfollows:
• Useastandardpickuptooltohandlethemicrophone.Becausethemicrophoneholeisonthebottomofthepackage,thepickuptoolcanmakecontactwithanypartofthelidsurface.
• Donotpickupthemicrophonewithavacuumtoolthatmakescontactwiththebottomsideofthemicrophone.Donotpullairoutoforblowairintothemicrophoneport.
• DonotuseexcessiveforcetoplacethemicrophoneonthePCB.REFLOWSOLDERForbestresults,thesolderingprofilemustbeinaccordancewiththerecommendationsofthemanufacturerofthesolderpasteusedtoattachtheMEMSmicrophonetothePCB.ItisrecommendedthatthesolderreflowprofilenotexceedthelimitconditionsspecifiedinFigure2andTable7.BOARDWASHWhenwashingthePCB,ensurethatwaterdoesnotmakecontactwiththemicrophoneport.Donotuseblow-offproceduresorultrasoniccleaning.
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OUTLINEDIMENSIONS
Figure15.6-TerminalChipArraySmallOutlineNoLeadCavity
3.50×2.65×0.98mmBodyDimensionsshowninmillimeters
Figure16.PackageMarkingSpecification(TopView)
ORDERINGGUIDEPART TEMPRANGE PACKAGE QUANTITY PACKAGINGICS-43434 −40°Cto+85°C 6-TerminalLGA_CAV 10,000 13”TapeandReel
EV_ICS-43434-FX FlexEvaluationBoard
PIN#1REFERENCE
CORNER
PIN#1REFERENCECORNER
0.98
0.75
0.23(REF)
2.65
3.50 3.20
R0.16
2.35
0.125
0.125
0.600(5X)
0.522(5X)
0.300
0.300
ø0.375
ø1.025
ø1.625
1.325
1.040
1.513
2.03
2.88
R0.125R0.240
YYXXX434
LOTTRACEABILITY CODE
PIN1INDICATIONPARTNUMBER
DATECODE
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REVISIONHISTORY
REVISIONDATE REVISION DESCRIPTION
4/26/2016 1.0 Initialversion
6/3/2016 1.1 UpdatedOrderingQuantity
8/29/2016 1.2 UpdatedHPMSNR,EINandDynamicRangevalue
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ICS-43434
Page21of21DocumentNumber:DS-000069Revision:1.2
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