ICS-41350 Datasheet by TDK InvenSense

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InvenSense
ICS41350
BottomPortPDMLowPowerMultiMode
MicrophoneWithHighAOPMode
InvenSensereservestherighttochangethedetail
specificationsasmayberequiredtopermitimprovements
inthedesignofitsproducts.
InvenSenseInc.
1745TechnologyDrive,SanJose,CA95110U.S.A
+1(408)988–7339
www.invensense.com
DocumentNumber:DS000047
Revision:1.0
ReleaseDate:Preliminary2/4/2016
GENERALDESCRIPTION
TheICS41350isalowpower,lownoisedigitalMEMS
microphoneinasmallpackage.TheICS41350consistsofa
MEMSmicrophoneelementandanimpedanceconverter
amplifierfollowedbyafourthorderΣ‐Δmodulator.Thepulse
densitymodulated(PDM)interfaceallowstwomicrophones
tobetimemultiplexedonadatalineusingasingleclock.
TheICS41350hasmultiplemodesofoperation:High
Performance,LowPower(AlwaysOn),StandardandSleep.
TheICS41350haslowpowerandhighSNRinalloperational
modes.Ithas126dBSPLAOPinHighPerformancemode,and
120dBSPLAOPinStandardandLowPowermodes.
TheICS41350supportsultrasoundapplicationsinHigh
PerformanceMode.Ithasanextendedultrasonicresponseupto
40kHzwithhighSNR.
TheICS41350isavailableinasmall3.5×2.65×0.98mm
surfacemountpackage.Itisreflowsoldercompatiblewith
nosensitivitydegradation.
APPLICATIONS
Smartphones
MicrophoneArrays
Tablets
Cameras
BluetoothHeadsets
NotebookPCs
SecurityandSurveillance
FEATURES
SPEC LOWPOWER
MODE
STANDARD
MODE
HIGH
PERFORMANCE
MODE
Sensitivity 26 dBFS ±1dB−26dBFS±1dB 32 dBFS ±1dB
SNR 63 dBA 64dBA 64 dBA
Current 185 µA 430µA 650 µA
AOP 120dBSPL120dBSPL 126 dBSPL
Clock 400
800kHz1.0
3.3MHz 4.1
4.8MHz
3.5×2.65×0.98mmsurfacemountpackage
Lowpower:185µAinLowPowerMode
Extendedfrequencyresponsefrom50Hzto>20kHz
Ultrasoundsupportupto40kHz
SleepMode:12µA
Highpowersupplyrejection(PSR):−97dBFS
FourthorderΣ‐Δmodulator
Digitalpulsedensitymodulation(PDM)output
CompatiblewithSn/PbandPbfreesolderprocesses
RoHS/WEEEcompliant
FUNCTIONALBLOCKDIAGRAM
ORDERINGINFORMATION
PART TEMPRANGEPACKAGING
ICS41350 40°Cto+85°C13”TapeandReel
EV_ICS41350FX

ICS41350
ADC
POWER
MANAGEMENT
CLK
DAT
A
VDD
GND
PDM
MODULATOR
CHANNEL
SELECT
SELECT
InvenSense
ICS41350
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DocumentNumber:DS000047
Revision:1.0
TABLEOFCONTENTS
GeneralDescription.....................................................................................................................................................................1
Applications.................................................................................................................................................................................1
Features.......................................................................................................................................................................................1
FunctionalBlockDiagram............................................................................................................................................................1
OrderingInformation...................................................................................................................................................................1
TableofContents....................................................................................................................................................................................2
Specifications..........................................................................................................................................................................................4
Table1.Acoustical/ElectricalCharacteristicsGeneral..............................................................................................................4
Table2.Acoustical/ElectricalCharacteristicsHighPerformanceMode...................................................................................4
Table3.Acoustical/ElectricalCharacteristicsStandardMode..................................................................................................5
Table4.Acoustical/ElectricalCharacteristicsLowPowerMode..............................................................................................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
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ICS41350
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HandlingInstructions............................................................................................................................................................................19
PickAndPlaceEquipment.........................................................................................................................................................19
ReflowSolder.............................................................................................................................................................................19
BoardWash...............................................................................................................................................................................19
OutlineDimensions...............................................................................................................................................................................20
OrderingGuide..........................................................................................................................................................................20
RevisionHistory.........................................................................................................................................................................21
ComplianceDeclarationDisclaimer......................................................................................................................................................22
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ICS41350
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SPECIFICATIONS
TABLE1.ACOUSTICAL/ELECTRICALCHARACTERISTICSGENERAL
TA=25°C,VDD=1.8to3.3V,SCK=2.4MHz,50×decimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot
guaranteed.
PARAMETER CONDITIONS MIN TYP MAXUNITS NOTES
PERFORMANCE
DirectionalityOmni
OutputPolarityInputacousticpressurevs.
outputdataNonInverted
SupplyVoltage(VDD) 1.65 3.63V
SleepModeCurrent(IS)SCK<200kHz 12 20µA
TABLE2.ACOUSTICAL/ELECTRICALCHARACTERISTICSHIGHPERFORMANCEMODE
TA=25°C,VDD=1.8to3.3V,SCK=4.8MHz,50×decimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot
guaranteed.
PARAMETER CONDITIONS MIN TYP MAXUNITS NOTES
Sensitivity1kHz,94dBSPL 33 32 31dB FS 1,2
SignaltoNoiseRatio(SNR)20kHzbandwidth,Aweighted 64 dBA
EquivalentInputNoise(EIN)20kHzbandwidth,Aweighted 30 dBA SPL
DynamicRangeDerivedfromEINandAOP 96 dB
Lowfrequency−3dBpoint 50 Hz 3
UltrasoundBandwidth 40 kHz
TotalHarmonicDistortion(THD)105dBSPL 0.2 1%
PowerSupplyRejection(PSR)217Hz,100mVppsquarewave
superimposedonVDD=1.8V,A
weighted
−97dBFS
PowerSupplyRejection—Swept
Sine
1kHzsinewave 100 dB FS
AcousticOverloadPoint10%THD126 dBSPL
FullScaleAcousticLevel0dBFSoutput 126 dBSPL
SupplyCurrent(IS)VDD=1.8V,noload 650 750µA
Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity.
Note2:Thesensitivityshallnotdeviatemorethan1.0dBfromitsinitialvalueafterreliabilitytests.
Note3:SeeFigure4.

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ICS41350
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TABLE3.ACOUSTICAL/ELECTRICALCHARACTERISTICSSTANDARDMODE
TA=25°C,VDD=1.8to3.3V,SCK=2.4MHz,50×decimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot
guaranteed.
PARAMETER CONDITIONS MIN TYP MAXUNITS NOTES
Sensitivity1kHz,94dBSPL 27 26 25dB FS 1,2
SignaltoNoiseRatio(SNR)20kHzbandwidth,Aweighted 64 dBA
EquivalentInputNoise(EIN)20kHzbandwidth,Aweighted 30 dBA SPL
DynamicRangeDerivedfromEINandAOP 90 dB
Lowfrequency−3dBpoint50 Hz3
TotalHarmonicDistortion(THD)105dBSPL 0.2 1%
PowerSupplyRejection(PSR)217Hz,100mVppsquarewave
superimposedonVDD=1.8V,A
weighted
−97dBFS
PowerSupplyRejection—Swept
Sine
1kHzsinewave 104 dB FS
AcousticOverloadPoint10%THD120 dBSPL
FullScaleAcousticLevel0dBFSoutput 120 dBSPL
SupplyCurrent(IS)VDD=1.8V,noload 430 500µA
Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity.
Note2:Thesensitivityshallnotdeviatemorethan1.0dBfromitsinitialvalueafterreliabilitytests.
Note3:SeeSeeFigure4.
TABLE4.ACOUSTICAL/ELECTRICALCHARACTERISTICSLOWPOWERMODE
TA=25°C,VDD=1.8to3.3V,SCK=768kHz,50×decimation,CLOAD=30pFunlessotherwisenoted.Typicalspecificationsarenot
guaranteed.
PARAMETER CONDITIONS MIN TYP MAXUNITS NOTES
Sensitivity1kHz,94dBSPL 27 26 25dB FS 1,2
SignaltoNoiseRatio(SNR)8kHzbandwidth,Aweighted 63 dBA
EquivalentInputNoise(EIN)8kHzbandwidth,Aweighted 31 dBA SPL
DynamicRangeDerivedfromEINandAOP 89 dB
Lowfrequency−3dBpoint50 Hz3
TotalHarmonicDistortion(THD)105dBSPL 0.2 1%
PowerSupplyRejection(PSR)217Hz,100mVppsquarewave
superimposedonVDD=1.8V,A
weighted
−97dBFS
PowerSupplyRejection—Swept
Sine
1kHzsinewave 98 dB FS
AcousticOverloadPoint10%THD120 dBSPL
FullScaleAcousticLevel0dBFSoutput 120 dBSPL
SupplyCurrent(IS)VDD=1.8V,noload 185 225µA
Note1:SensitivityisrelativetotheRMSlevelofasinewavewithpositiveamplitudeequalto100%1sdensityandnegativeamplitudeequalto0%1sdensity.
Note2:Thesensitivityshallnotdeviatemorethan1.0dBfromitsinitialvalueafterreliabilitytests.
Note3:SeeFigure4.

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ICS41350
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Revision:1.0
TABLE5.DIGITALINPUT/OUTPUTCHARACTERISTICS
TA=25°C,1.8V<VDD<3.3V,unlessotherwisenoted.
PARAMETER CONDITIONS MIN TYP MAXUNITS NOTES
InputVoltageHigh(VIH) 0.65xVDD V
InputVoltageLow(VIL) 0.35xVDDV
OutputVoltageHigh(VOH)ILOAD=0.5mA0.7xVDDVDD V
OutputVoltageLow(VOL)ILOAD=0.5mA00.3xVDDV
OutputDCOffsetPercentoffullscale 3%
Latency <30 µs
TABLE6.PDMDIGITALINPUT/OUTPUT
TA=25°C,1.8V<VDD<3.3V,unlessotherwisenoted.
PARAMETERCONDITIONS MIN TYPMAXUNITS NOTES
MODESWITCHING
SleepTimeTimefromfCLK falling<200 kHz 1ms
WakeUpTimeHighPerformance
&
Standard modes,
SleepModetofCLK>1MHz,output
within0.5dBoffinalsensitivity,power
on
20ms
WakeUpTimeLowPowerMode,SleepMode tofCLK
>400kHz,outputwithin0.5dBoffinal
sensitivity,poweron
20ms
SwitchingtimeBetweenLowPowerandStandard
Modes10ms
SwitchingtimeBetweenLowPowerandHigh
PerformanceModes10ms
INPUT
tCLKINInputclockperiod208 2500ns
ClockFrequency(CLK)
SleepMode200kHz
LowPowerMode400 800kHz
StandardMode1.0 3.3MHz
HighPerformanceMode4.1 4.8MHz
ClockDutyCyclefCLK<3.3MHz 40 60%
fCLK>4.1 MHz 48 52%
tRISECLKrisetime(10%to90%level) 25ns 1
tFALLCLKfalltime(90%to10%level) 25ns 1
OUTPUT
t1OUTENDATA1(right)drivenafterfallingclock
edge
50 ns
t1OUTDISDATA1(right)disabledafterrising
clockedge
540ns
t2OUTENDATA2(left)drivenafterrisingclock
edge
50 ns
t2OUTDISDATA2(left)disabledafterfallingclock
edge
540ns
Note 1: Guaranteed by design
InvenSense
ICS41350
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Revision:1.0
TIMINGDIAGRAM
Figure1.PulseDensityModulatedOutputTiming
t
CLKIN
CLK
DATA2
DATA1
t
2OUTDIS
t
1OUTDIS
t
2OUTEN
t
1OUTEN
t
RISE
t
FALL
InvenSense Am
ICS41350
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Revision:1.0
ABSOLUTEMAXIMUMRATINGS
StressabovethoselistedasAbsoluteMaximumRatingsmaycausepermanentdamagetothedevice.Thesearestressratingsonly
andfunctionaloperationofthedeviceattheseconditionsisnotimplied.Exposuretotheabsolutemaximumratingsconditionsfor
extendedperiodsmayaffectdevicereliability.
TABLE7.ABSOLUTEMAXIMUMRATINGS
PARAMETER RATING
SupplyVoltage(VDD)0.3Vto+3.63 V
DigitalPinInputVoltage−0.3VtoVDD +0.3Vor3.63 V,whicheverisless
SoundPressureLevel160 dB
MechanicalShock10,000g
VibrationPerMILSTD883Method2007,TestConditionB
TemperatureRange
Biased−40°Cto+85°C
Storage−55
°
Cto+150
°
C
ESDCAUTION


ESD(electrostaticdischarge)sensitivedevice.
Chargeddevicesandcircuitboardscan
dischargewithoutdetection.Althoughthis
productfeaturespatentedorproprietary
protectioncircuitry,damagemayoccuron
devicessubjectedtohighenergyESD.
ThereforeproperESDprecautionsshouldbe
takentoavoidperformancedegradationor
lossoffunctionality.
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ICS41350
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Revision:1.0
SOLDERINGPROFILE
Figure2.RecommendedSolderingProfileLimits
TABLE8.RECOMMENDEDSOLDERINGPROFILE*
PROFILEFEATURESn63/Pb37PbFree
AverageRampRate(TLtoTP)1.25°C/sec max 1.25°C/secmax
Preheat
MinimumTemperature
(TSMIN)100°C100°C
Maximum
Temperature(TSMAX)150°C200°C
Time(TSMINtoTSMAX),tS60secto75sec60secto75sec
RampUpRate(TSMAXtoTL)1.25°C/sec1.25°C/sec
TimeMaintainedAboveLiquidous(tL)45secto75sec~50sec
LiquidousTemperature(TL)183°C217°C
PeakTemperature(TP)215°C+3°C/3°C260°C+0°C/5°C
TimeWithin+5°CofActualPeak
Temperature(tP)20secto30sec20secto30sec
RampDownRate3°C/secmax3°C/secmax
Time+25°C(t25°C)toPeakTemperature5minmax5minmax
*ThereflowprofileinTable8isrecommendedforboardmanufacturingwithInvenSenseMEMSmicrophones.Allmicrophonesare
alsocompatiblewiththeJSTD020profile
t
P
t
L
t
25°C
TO PEAK TEMPERATURE
t
S
PREHEAT
CRITIC
LZONE
T
L
TO T
P
TEMPER
A
TURE
TIME
RAMP-DOWN
RAMP-UP
T
SMIN
T
SMAX
T
P
T
L
InvenSense \ \ \ \ \ I I I l l 1 z I I I I I I I I source asthe VDD Din.
ICS41350
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Revision:1.0
PINCONFIGURATIONSANDFUNCTIONDESCRIPTIONS
Figure3.PinConfiguration(TopView,TerminalSideDown)
TABLE9.PINFUNCTIONDESCRIPTIONS
PINNAMEFUNCTION
1DATADigitalOutputSignal(DATA1orDATA2)
2SELECT
LeftChannelorRightChannelSelect:
DATA1(right):SELECTtiedtoGND
DATA2(left):SELECTtiedtoVDD.Inthissetting,SELECTshouldbetiedtothesamevoltage
sourceastheVDD
p
in.
3GNDGround
4CLKClockInputtoMicrophone
5VDD
PowerSupply.Forbestperformanceandtoavoidpotentialparasiticartifacts,placea0.1µF
(100nF)ceramictypeX7RcapacitorbetweenPin5(VDD)andground.Placethecapacitoras
closetoPin5aspossible.
DATA
VDD
GND
1
2
3
5
4
SELECT
CLK
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ICS41350
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TYPICALPERFORMANCECHARACTERISTICS
Figure4.TypicalFrequencyResponse
Figure5.THD+Nvs.InputLevel

Figure6.PowerSupplyRejection(PSR)vs.Frequency
Figure7.Linearity


20
10
0
10
20
30
10 100 1000 10000
NORMALIZEDAMPLITUDE(dB)
FREQUENCY(Hz)
0.1
1
10
90 100 110 120 130
THD+N(%)
INPUTAMPLITUDE(dBSPL)
LowPowerMode
HighPerformanceMode
StandardMode
120
100
80
60
40
20
0
100 1000 10000
PSR(dBFS)
FREQUENCY(Hz)
40
30
20
10
0
90 100 110 120 130
OUTPUTAMPLITUDE(dBFS)
INPUTAMPLITUDE(dBSPL)
Standard&Low
PowerModes
HighPerformance
Mode
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ICS41350
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DocumentNumber:DS000047
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THEORYOFOPERATION
PDMDATAFORMAT
TheoutputfromtheDATApinoftheICS41350isinpulsedensitymodulated(PDM)format.Thisdataisthe1bitoutputofafourth
orderΣ‐Δmodulator.ThedataisencodedsothattheleftchannelisclockedonthefallingedgeofCLK,andtherightchannelisclocked
ontherisingedgeofCLK.AfterdrivingtheDATAsignalhighorlowintheappropriatehalfframeoftheCLKsignal,theDATAdriverof
themicrophonetristates.Inthisway,twomicrophones,onesettotheleftchannelandtheothertotheright,candriveasingleDATA
line.SeeFigure1foratimingdiagramofthePDMdataformat;theDATA1andDATA2linesshowninthisfigurearetwohalvesofthe
singlephysicalDATAsignal.Figure8showsadiagramofthetwostereochannelssharingacommonDATAline.
Figure8.StereoPDMFormat
IfonlyonemicrophoneisconnectedtotheDATAsignal,theoutputisonlyclockedonasingleedge(Figure9).Forexample,aleft
channelmicrophoneisneverclockedontherisingedgeofCLK.Inasinglemicrophoneapplication,eachbitoftheDATAsignalis
typicallyheldforthefullCLKperioduntilthenexttransitionbecausetheleakageoftheDATAlineisnotenoughtodischargetheline
whilethedriveristristated.
Figure9.MonoPDMFormat
SeeTable10forthechannelassignmentsaccordingtothelogiclevelontheSELECTpin.
TABLE10.ICS41350CHANNELSETTING
ForPDMdata,thedensityofthepulsesindicatesthesignalamplitude.Ahighdensityofhighpulsesindicatesasignalnearpositive
fullscale,andahighdensityoflowpulsesindicatesasignalnearnegativefullscale.Aperfectzero(dc)audiosignalshowsan
alternatingpatternofhighandlowpulses.
TheoutputPDMdatasignalhasadcoffsetofabout3%offullscale.Ahighpassfilterinthecodecthatisconnectedtothedigital
microphoneanddoesnotaffecttheperformanceofthemicrophonetypicallyremovesthisdcsignal.
PDMMICROPHONESENSITIVITY
ThesensitivityofaPDMoutputmicrophoneisspecifiedwiththeunitdBFS(decibelsrelativetodigitalfullscale).A0dBFSsine
waveisdefinedasasignalwhosepeakjusttouchesthefullscalecodeofthedigitalword(seeFigure10).Thismeasurement
conventionalsomeansthatsignalswithadifferentcrestfactormayhaveanRMSlevelhigherthan0dBFS.Forexample,afullscale
squarewavehasanRMSlevelof3dBFS.
DATA2 (L) DATA2 (L)DATA1 (R) DATA1 (R)
CLK
DATA
DATA1 (R) DATA1 (R) DATA1 (R)
CLK
DATA
SELECTPinSettingChannel
Low(tietoGND)Right(DATA1)
High(tietoVDD)Left(DATA2)
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ICS41350
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Thisdefinitionofa0dBFSsignalmustbeunderstoodwhenmeasuringthesensitivityoftheICS41350.A1kHzsinewaveata
94dBSPLacousticinputtotheICS41350resultsinanoutputsignalwitha−26dBFSlevelinStandardModeand−32dBFSinHigh
PerformanceMode.IntheStandardModeexample,theoutputdigitalwordpeaksat−26dBbelowthedigitalfullscalelevel.A
commonmisunderstandingisthattheoutputhasanRMSlevelof−29dBFS;however,thisisnottruebecauseofthedefinitionofthe
0dBFSsinewave.
Figure10.1kHz,0dBFSSineWave
Thereisnotacommonlyacceptedunitofmeasurementtoexpresstheinstantaneouslevel,asopposedtotheRMSlevelofthe
signal,ofadigitalsignaloutputfromthemicrophone.Somemeasurementsystemsexpresstheinstantaneouslevelofanindividual
sampleinunitsofD,where1.0Disdigitalfullscale.Inthiscase,a−26dBFSsinewavehaspeaksat0.05D.
1.0
–1.0
–0.8
–0.6
–0.4
–0.2
0
0.2
0.4
0.6
0.8
00.91.00.80.70.60.50.40.30.20.1
DIGITAL AMPLITUDE (D)
TIME (ms)
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ICS41350
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APPLICATIONSINFORMATION
LOWPOWERMODE
LowPowerMode(LPM)enablestheICS41350tobeusedinanAlwaysOnlisteningmodeforkeywordspottingandambientsound
analysis.TheICS41350willenterLPMwhenthefrequencyofSCKisbetween400and800kHz.Inthismode,themicrophone
consumesonly185µAwhileretaininghighelectroacousticperformance.
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
APDMoutputmicrophoneistypicallyconnectedtoacodecwithadedicatedPDMinput.Thiscodecseparatelydecodestheleftandright
channelsandfiltersthehighsampleratemodulateddatabacktotheaudiofrequencyband.Thiscodecalsogeneratestheclockforthe
PDMmicrophonesorissynchronouswiththesourcethatisgeneratingtheclock.Figure11andFigure12showmonoandstereo
connectionsoftheICS41350toacodec.ThemonoconnectionshowsanICS41350settooutputdataontherightchannel.Tooutput
ontheleftchannel,tietheSELECTpintoVDDinsteadoftyingittoGND.
Figure11.MonoPDMMicrophone(RightChannel)ConnectiontoCodec
CLOCKOUTPUT
CODEC
0.1µF
1
.
8
VTO3
.
3V
GND
SELECT DATA
ICS41350 CLK
VDD
DATAINPUT
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ICS41350
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Figure12.StereoPDMMicrophoneConnectiontoCodec
DecoupletheVDDpinoftheICS41350toGNDwitha0.1µFcapacitor.PlacethiscapacitorasclosetoVDDastheprintedcircuitboard
(PCB)layoutallows.
DonotuseapulluporpulldownresistoronthePDMdatasignallinebecauseitcanpullthesignaltoanincorrectstateduringtheperiod
thatthesignallineistristated.
TheDATAsignaldoesnotneedtobebufferedinnormalusewhentheICS41350microphone(s)isplacedclosetothecodeconthePCB.If
theDATAsignalmustbedrivenoveralongcable(>15cm)orotherlargecapacitiveload,adigitalbuffermayberequired.Onlyuseasignal
bufferontheDATAlinewhenonemicrophoneisinuseorafterthepointwheretwomicrophonesareconnected(seeFigure13).The
DATAoutputofeachmicrophoneinastereoconfigurationcannotbeindividuallybufferedbecausethetwobufferoutputscannot
driveasinglesignalline.Ifabufferisused,takecaretoselectonewithlowpropagationdelaysothatthetimingofthedata
connectedtothecodecisnotcorrupted.

Figure13.BufferedConnectionsBetweenStereoICS41350sandaCodec
CLOCKOUTPUT
CODEC
0.1µF
1
.
8
VTO3
.
3V
GND
SELECT DATA
ICS41350 CLK
VDD
DATAINPUT
0.1µF
1.8V TO 3.3V
GND
SELECT DATA
ICS41350 CLK
VDD
CLOCKOUTPUT
CODEC
DATA
ICS41350
ICS41350
CLK
DATA
CLK
DATAINPUT
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WhenlongwiresareusedtoconnectthecodectotheICS41350,asourceterminationresistorcanbeusedontheclockoutputofthe
codecinsteadofabuffertominimizesignalovershootorringing.Matchthevalueofthisresistortothecharacteristicimpedanceof
theCLKtraceonthePCB.Dependingonthedrivecapabilityofthecodecclockoutput,abuffermaystillbeneeded,asshowninFigure
13.
ULTRASOUNDAPPLICATIONS
InitsHighPerformanceMode,theICS41350functionsasanultrasonicsensor,aswellasanaudiobandsensor.Thismicrophone’s
ultrasonicperformancewilldependontheclockfrequency,thelowpassdecimationfilter,thestrengthoftheultrasonicsignalbeing
sensed,andthedesignoftheacousticportthatiscoupledtothemicrophone.Theacousticportdesignisespeciallyimportantat
higherfrequencies,becausethesizeoftheportitselfisontheorderof¼thewavelengthofsoundandtheacousticmassloadingwill
besignificant.Thesewillbothcontributetotheporthavingaconsiderableeffectontheacousticsystem’sresponse.
SLEEPMODE
Themicrophoneenterssleepmodewhentheclockfrequencyfallsbelow200kHz.Inthismode,themicrophonedataoutputisinahigh
impedancestate.Thecurrentconsumptioninsleepmodeislessthan20µA.

TheICS41350enterssleepmodewithin1msoftheclockfrequencyfallingbelow200kHz.Themicrophonewakesupfromsleep
modeandbeginstooutputdatawithin20msofwhentheclockbecomesactive.
STARTUPTIME
ThestartuptimeoftheICS41350islessthan20ms.ThePDMdatafromthemicrophoneisvalidtobeusedassoonasthedatais
beingoutput.
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SUPPORTINGDOCUMENTS
Foradditionalinformation,seethefollowingdocuments.
APPLICATIONNOTES
AN000048,PDMDigitalOutputMEMSMicrophoneFlexEvaluationBoardUserGuide
AN100,MEMSMicrophoneHandlingandAssemblyGuide
AN1003,RecommendationsforMountingandConnectingtheInvensense,BottomPortedMEMSMicrophones
AN1112,MicrophoneSpecificationsExplained
AN1124,RecommendationsforSealingInvenSenseBottomPortMEMSMicrophonesfromDustandLiquidIngress
AN1140,MicrophoneArrayBeamforming
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PCBDESIGNANDLANDPATTERNLAYOUT
TherecommendedPCBlandpatternfortheICS41350isa1:1ratioofthesolderpadsonthemicrophonepackage,asshowninFigure
14.AvoidapplyingsolderpastetothesoundholeinthePCB.AsuggestedsolderpastestencilpatternlayoutisshowninFigure15.
TheresponseoftheICS41350isnotaffectedbythePCBholesizeaslongastheholeisnotsmallerthanthesoundportofthe
microphone(0.375mmindiameter).A0.5mmto1mmdiameterfortheholeisrecommended.Takecaretoaligntheholeinthe
microphonepackagewiththeholeinthePCB.Theexactdegreeofthealignmentdoesnotaffectthemicrophoneperformanceaslong
astheholesarenotpartiallyorcompletelyblocked.
Figure14.RecommendedPCBLandPatternLayout
Figure15.SuggestedSolderPasteStencilPatternLayout
PCBMATERIALANDTHICKNESS
TheperformanceoftheICS41350isnotaffectedbyPCBthickness.TheICS41350canbemountedoneitherarigidorflexiblePCB.
AflexiblePCBwiththemicrophonecanbeattacheddirectlytothedevicehousingwithanadhesivelayer.Thismountingmethod
offersareliablesealaroundthesoundportwhileprovidingtheshortestacousticpathforgoodsoundquality.
Ø1.025
Ø1.625
0.522x0.725(4X)
1.252
0.822
1.675
0.838
1.2520.822
1.675
0.1(4x)
Ø1.125
Ø1.625
0.422x0.625(4X)
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HANDLINGINSTRUCTIONS
PICKANDPLACEEQUIPMENT
TheMEMSmicrophonecanbehandledusingstandardpickandplaceandchipshootingequipment.Takecaretoavoiddamagetothe
MEMSmicrophonestructureasfollows:
Useastandardpickuptooltohandlethemicrophone.Becausethemicrophoneholeisonthebottomofthepackage,the
pickuptoolcanmakecontactwithanypartofthelidsurface.
Donotpickupthemicrophonewithavacuumtoolthatmakescontactwiththebottomsideofthemicrophone.
Donotpullairoutoforblowairintothemicrophoneport.
DonotuseexcessiveforcetoplacethemicrophoneonthePCB.
REFLOWSOLDER
Forbestresults,thesolderingprofilemustbeinaccordancewiththerecommendationsofthemanufacturerofthesolderpasteusedto
attachtheMEMSmicrophonetothePCB.Itisrecommendedthatthesolderreflowprofilenotexceedthelimitconditionsspecified
inFigure2andTable8.
BOARDWASH
WhenwashingthePCB,ensurethatwaterdoesnotmakecontactwiththemicrophoneport.Donotuseblowoffproceduresor
ultrasoniccleaning.
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OUTLINEDIMENSIONS
Figure16.5TerminalChipArraySmallOutlineNoLeadCavity[LGA_CAV]
3.5mm×2.65mm×0.98mmBody
Dimensionsshowninmillimeters
Dimensiontoleranceis±0.15mmunlessotherwisespecified
Figure17.PackageMarkingSpecification(TopView)
ORDERINGGUIDE
PARTTEMPRANGEPACKAGE QUANTITY PACKAGING
ICS41350−40°Cto+85°C5TerminalLGA_CAV 5,00013”TapeandReel
EV_ICS41350FXEvaluationBoard

BOTTOMVIEW
SIDEVIEW
TOPVIEW
B
d0.10
A
(4X)
f0.10C
C
(2.45)
(3.30)
3.50
2.65
j0.10mCAB
0.522X0.725(4x)
PIN1
CORNER
(0.254)
0.98
1.040
1.33
Ø0.375
Ø1.025
Ø1.625
0.300
1.513
3.500
0.125
0.950
1.675
0.125
2.650
0.82
1
5
2
4
3
PIN1
CORNER
YYXXX
350
LOTTRACEABILITY CODE
PIN1INDIC
A
TION
P
A
R
TNUMBE
R
D
AT E CO D E
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REVISIONHISTORY
REVISIONDATEREVISIONDESCRIPTION
2/4/20161.0Initialversion
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Revision:1.0
COMPLIANCEDECLARATIONDISCLAIMER
InvenSensebelievestheenvironmentalandothercomplianceinformationgiveninthisdocumenttobecorrectbutcannot
guaranteeaccuracyorcompleteness.Conformitydocumentssubstantiatingthespecificationsandcomponentcharacteristicsareon
file.InvenSensesubcontractsmanufacturing,andtheinformationcontainedhereinisbasedondatareceivedfromvendorsand
suppliers,whichhasnotbeenvalidatedbyInvenSense.
ThisinformationfurnishedbyInvenSenseisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedby
InvenSenseforitsuse,orforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specifications
aresubjecttochangewithoutnotice.InvenSensereservestherighttomakechangestothisproduct,includingitscircuitsand
software,inordertoimproveitsdesignand/orperformance,withoutpriornotice.InvenSensemakesnowarranties,neither
expressednorimplied,regardingtheinformationandspecificationscontainedinthisdocument.InvenSenseassumesno
responsibilityforanyclaimsordamagesarisingfrominformationcontainedinthisdocument,orfromtheuseofproductsand
servicesdetailedtherein.Thisincludes,butisnotlimitedto,claimsordamagesbasedontheinfringementofpatents,copyrights,
maskworkand/orotherintellectualpropertyrights.
CertainintellectualpropertyownedbyInvenSenseanddescribedinthisdocumentispatentprotected.Nolicenseisgrantedby
implicationorotherwiseunderanypatentorpatentrightsofInvenSense.Thispublicationsupersedesandreplacesallinformation
previouslysupplied.Trademarksthatareregisteredtrademarksarethepropertyoftheirrespectivecompanies.InvenSensesensors
shouldnotbeusedorsoldinthedevelopment,storage,productionorutilizationofanyconventionalormassdestructiveweapons
orforanyotherweaponsorlifethreateningapplications,aswellasinanyotherlifecriticalapplicationssuchasmedicalequipment,
transportation,aerospaceandnuclearinstruments,underseaequipment,powerplantequipment,disasterpreventionandcrime
preventionequipment.
©2016InvenSense,Inc.Allrightsreserved.InvenSense,MotionTracking,MotionProcessing,MotionProcessor,MotionFusion,
MotionApps,DMP,AARandtheInvenSenselogoaretrademarksofInvenSense,Inc.Othercompanyandproductnamesmaybe
trademarksoftherespectivecompanieswithwhichtheyareassociated.
©2016InvenSense,Inc.Allrightsreserved.

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