DS-000069 ICS-43434 v1 - InvenSense · 2016-10-13 · ICS-43434 Page 5 of 21 Document Number:...
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ICS-43434 Multi-Mode Microphone with I 2 S Digital Output InvenSense reserves the right to change the detail specifications as may be required to permit improvements in the design of its products. InvenSense Inc. 1745 Technology Drive, San Jose, CA 95110 U.S.A +1(408) 988–7339 www.invensense.com Document Number: DS-000069 Revision: 1.2 Release Date: 08/29/2016 GENERAL DESCRIPTION The ICS-43434 is digital I 2 S output bottom port microphone. The complete ICS-43434 solution consists of a MEMS sensor, signal conditioning, an analog-to-digital converter, decimation and antialiasing filters, power management, and an industry standard 24-bit I²S interface. The I²S interface allows the ICS-43434 to connect directly to digital processors, such as DSPs and microcontrollers, without the need for an audio codec in the system. The ICS-43434 has multiple modes of operation: High Performance, Low Power (AlwaysOn) and Sleep. The ICS-43434 has high SNR and 120 dB SPL AOP in all operational modes. The ICS-43434 has a high SNR of 65 dBA and a wideband frequency response. The sensitivity tolerance of the ICS-43434 is ±1 dB, which enables high-performance microphone arrays without the need for system calibration. The ICS-43434 is available in a small 3.50 mm × 2.65 mm × 0.98 mm surface-mount package. The ICS-43434 is function- compatible with the ICS-43432 while providing equivalent electro-acoustic performance at lower power consumption and in a smaller package. APPLICATIONS • Wearables • Smart Televisions • Remote Controls • IoT Devices • Teleconferencing Systems • Gaming Consoles • Security Systems FEATURES SPEC HIGH PERFORMANCE MODE LOW-POWER MODE Sensitivity −26 dB FS ±1 dB −26 dB FS ±1 dB SNR 65 dBA 64 dBA Current 490 µA 230 µA AOP 120 dB SPL 120 dB SPL Sample Rate 23 – 51.6 kHz 6.25 – 18.75 kHz • Digital I²S interface with high precision 24-bit data • Wide frequency response from 60 Hz to 20 kHz • High power supply rejection: −100 dB FS • Small 3.50 mm × 2.65 mm × 0.98 mm surface-mount package • Compatible with Sn/Pb and Pb-free solder processes • RoHS/WEEE compliant FUNCTIONAL BLOCK DIAGRAM ORDERING INFORMATION PART TEMP RANGE PACKAGING ICS-43434 −40°C to +85°C 13” Tape & Reel EV_ICS-43434-FX — ICS-43434 ADC FILTER HARDWARE CONTROL I 2 S SERIAL PORT POWER MANAGEMENT SCK SD WS VDD GND LR
Transcript of DS-000069 ICS-43434 v1 - InvenSense · 2016-10-13 · ICS-43434 Page 5 of 21 Document Number:...
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
ICS-43434
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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
ICS-43434
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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
ICS-43434
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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
ICS-43434
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SUPPORTINGDOCUMENTSForadditionalinformation,seethefollowingdocuments.EVALUATIONBOARDUSERGUIDEAN-000088,Bottom-PortI2SOutputMEMSMicrophoneEvaluationBoardAPPLICATIONNOTESAN-100,MEMSMicrophoneHandlingandAssemblyGuideAN-1003,RecommendationsforMountingandConnectingtheInvenSenseBottom-PortedMEMSMicrophonesAN-1112,MicrophoneSpecificationsExplainedAN-1124,RecommendationsforSealingInvenSenseBottom-PortMEMSMicrophonesfromDustandLiquidIngressAN-1140,MicrophoneArrayBeamforming
ICS-43434
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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.
ICS-43434
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HANDLINGINSTRUCTIONS PICKANDPLACEEQUIPMENTTheMEMSmicrophonecanbehandledusingstandardpick-and-placeandchipshootingequipment.TakecaretoavoiddamagetotheMEMSmicrophonestructureasfollows:
• Useastandardpickuptooltohandlethemicrophone.Becausethemicrophoneholeisonthebottomofthepackage,thepickuptoolcanmakecontactwithanypartofthelidsurface.
• Donotpickupthemicrophonewithavacuumtoolthatmakescontactwiththebottomsideofthemicrophone.Donotpullairoutoforblowairintothemicrophoneport.
• DonotuseexcessiveforcetoplacethemicrophoneonthePCB.REFLOWSOLDERForbestresults,thesolderingprofilemustbeinaccordancewiththerecommendationsofthemanufacturerofthesolderpasteusedtoattachtheMEMSmicrophonetothePCB.ItisrecommendedthatthesolderreflowprofilenotexceedthelimitconditionsspecifiedinFigure2andTable7.BOARDWASHWhenwashingthePCB,ensurethatwaterdoesnotmakecontactwiththemicrophoneport.Donotuseblow-offproceduresorultrasoniccleaning.
ICS-43434
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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
ICS-43434
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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
ICS-43434
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