EV_ICS-41350-FX - InvenSense

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AN‐000048

PDMDigitalOutputMEMSMicrophoneFlexEvaluationBoard

UserGuide

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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:AN‐000048

Revision:1.1

ReleaseDate:1/25/2016

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GENERALDESCRIPTION

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ThisuserguideappliestothefollowingMEMSmicrophone

evaluationboards:

 EV_ICS‐41350‐FX

 EV_INMP421‐FX

 EV_INMP521‐FX

 EV_INMP522‐FX

 EV_INMP621‐FX

Thisisasimpleevaluationboardthatallowsquickevaluation

oftheperformanceofPDMMEMSmicrophones.Thesmall

sizeandlowprofileoftheflexiblePCBenablesdirect

placementofthemicrophoneintoaprototypeoranexisting

designforaninsituevaluation.Theevaluationboardconsists

ofabottomportmicrophonesolderedtoaflexiblePCBwith

color‐codedwiresattached.Theonlyothercomponenton

theboardisa0.1μFsupplybypasscapacitor.

Table1describesthefunctionsofthefiveconnectionwires.

Table2describesthefunctionaldifferencesbetweenthe

differentmicrophonesthatareusedwiththisflexcircuit.

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TABLE1.PINFUNCTIONDESCRIPTIONS

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Wire

Color

Microphone

PinDescription

BlueDATAPDMdigitaloutputsignal

RedVDDPowersupply,1.62Vto3.63VDC

WhiteCLKClockinput

BlackGNDGround

YellowL/RSELEC

Left/rightchannelselect

DATA1(right):L/RSELECTtiedto

GND

DATA2(left):L/RSELECTpulledtoVDD

TABLE2.MICROPHONEFUNCTIONAL

DIFFERENCES

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Microphone

Maximum

Supply

CurrentSensitivityClockFrequency

ICS‐41350 0.65mA −26dBFS

−32dBFS

400kHzto3.3 MHz

4.1to4.8MHz

INMP421 0.65mA −26dBFS1.0to3.3 MHz

INMP521 1.2mA −26dBFS1.25 to3.072 MHz

INMP522 1.2mA −26dBFS0.9to3.6 MHz

INMP621 1.3mA −46dBFS0.9to3.6 MHz

EVALUATIONBOARDCIRCUIT

Figure1showstheschematicoftheevaluationboards,and

Figure3(EV_ICS‐41350‐FX)andFigure3(allothers)showthe

flexboardlayouts.Seetherespectivemicrophonedata

sheetsforcompletedescriptionsandspecificationsofthe

microphones.

Figure1.EvaluationBoardSchematic

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Figure2.EV_ICS‐41350‐FXBoardLayout(TopView)

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BLACK: GND

WHITE: CLK

MICROPHONE

YELLOW:

L/R SELECT

CLK

L/R SELECT

VDD

DATA

GND

BLUE: DATA

RED: V

0.1µF

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AN‐000048

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DocumentNumber:AN‐000048

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Revision:1.1

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Figure3.EvaluationBoardLayout(TopView)

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Figure4.EvaluationBoardDimensionsinMillimeters(WiresNot

Included)

EVALUATIONBOARDPHOTOGRAPHS

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Figure5.EV_ICS‐41350‐FXTopView

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Figure6.TopandBottomView(AllOthers)

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12.00

3.60

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AN‐000048

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DocumentNumber:AN‐000048Page3of3

Revision:1.1

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COMPLIANCEDECLARATIONDISCLAIMER

InvenSensebelievestheenvironmentalandothercomplianceinformationgiveninthisdocumenttobecorrectbutcannot

guaranteeaccuracyorcompleteness.Conformitydocumentssubstantiatingthespecificationsandcomponentcharacteristicsareon

file.InvenSensesubcontractsmanufacturingandtheinformationcontainedhereinisbasedondatareceivedfromvendorsand

suppliers,whichhasnotbeenvalidatedbyInvenSense.

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ThisinformationfurnishedbyInvenSenseisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedby

InvenSenseforitsuse,orforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specifications

aresubjecttochangewithoutnotice.InvenSensereservestherighttomakechangestothisproduct,includingitscircuitsand

software,inordertoimproveitsdesignand/orperformance,withoutpriornotice.InvenSensemakesnowarranties,neither

expressednorimplied,regardingtheinformationandspecificationscontainedinthisdocument.InvenSenseassumesno

responsibilityforanyclaimsordamagesarisingfrominformationcontainedinthisdocument,orfromtheuseofproductsand

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maskworkand/orotherintellectualpropertyrights.

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CertainintellectualpropertyownedbyInvenSenseanddescribedinthisdocumentispatentprotected.Nolicenseisgrantedby

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preventionequipment.

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MotionApps,DMP,AAR,andtheInvenSenselogoaretrademarksofInvenSense,Inc.Othercompanyandproductnamesmaybe

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