AN000048 PDMDigitalOutputMEMSMicrophoneFlexEvaluationBoard UserGuide GENERALDESCRIPTION ThisuserguideappliestothefollowingMEMSmicrophone evaluationboards: EV_ICS41350FX EV_INMP421FX EV_INMP521FX EV_INMP522FX EV_INMP621FX TABLE2.MICROPHONEFUNCTIONAL DIFFERENCES Maximum Supply Microphone Current Sensitivity ICS41350 Thisisasimpleevaluationboardthatallowsquickevaluation oftheperformanceofPDMMEMSmicrophones.Thesmall sizeandlowprofileoftheflexiblePCBenablesdirect placementofthemicrophoneintoaprototypeoranexisting designforaninsituevaluation.Theevaluationboardconsists ofabottomportmicrophonesolderedtoaflexiblePCBwith colorcodedwiresattached.Theonlyothercomponenton theboardisa0.1Fsupplybypasscapacitor. Table1describesthefunctionsofthefiveconnectionwires. Table2describesthefunctionaldifferencesbetweenthe differentmicrophonesthatareusedwiththisflexcircuit. TABLE1.PINFUNCTIONDESCRIPTIONS Wire Color Microphone Pin Description Blue DATA PDMdigitaloutputsignal Red VDD Powersupply,1.62Vto3.63VDC White CLK Clockinput Black GND Ground 0.65mA ClockFrequency -26dBFS 400kHzto3.3 MHz -32dBFS 4.1to4.8MHz INMP421 0.65mA -26dBFS 1.0to3.3 MHz INMP521 1.2mA -26dBFS 1.25 to3.072 MHz INMP522 1.2mA -26dBFS 0.9to3.6 MHz INMP621 1.3mA -46dBFS 0.9to3.6 MHz EVALUATIONBOARDCIRCUIT Figure1showstheschematicoftheevaluationboards,and Figure3(EV_ICS41350FX)andFigure3(allothers)showthe flexboardlayouts.Seetherespectivemicrophonedata sheetsforcompletedescriptionsandspecificationsofthe microphones. RED: VDD Yellow L/RSELECT U1 MICROPHONE WHITE: CLK YELLOW: L/R SELECT 1 CLK 2 L/R SELECT VDD 4 C1 0.1F DATA 5 GND 3 BLUE: DATA Left/rightchannelselect DATA1(right):L/RSELECTtiedto GND BLACK: GND DATA2(left):L/RSELECTpulledtoVDD Figure1.EvaluationBoardSchematic Figure2.EV_ICS41350FXBoardLayout(TopView) InvenSensereservestherighttochangethedetail specificationsasmayberequiredtopermit improvementsinthedesignofitsproducts. InvenSenseInc. 1745TechnologyDrive,SanJose,CA95110U.S.A +1(408)988-7339 www.invensense.com DocumentNumber:AN000048 Revision:1.1 ReleaseDate:1/25/2016 AN000048 Figure3.EvaluationBoardLayout(TopView) 3.60 12.00 Figure4.EvaluationBoardDimensionsinMillimeters(WiresNot Included) EVALUATIONBOARDPHOTOGRAPHS Figure5.EV_ICS41350FXTopView Figure6.TopandBottomView(AllOthers) DocumentNumber:AN000048 Revision:1.1 Page2of3 AN000048 COMPLIANCEDECLARATIONDISCLAIMER InvenSensebelievestheenvironmentalandothercomplianceinformationgiveninthisdocumenttobecorrectbutcannot guaranteeaccuracyorcompleteness.Conformitydocumentssubstantiatingthespecificationsandcomponentcharacteristicsareon file.InvenSensesubcontractsmanufacturingandtheinformationcontainedhereinisbasedondatareceivedfromvendorsand 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. (c)2016InvenSense,Inc.Allrightsreserved.InvenSense,MotionTracking,MotionProcessing,MotionProcessor,MotionFusion, MotionApps,DMP,AAR,andtheInvenSenselogoaretrademarksofInvenSense,Inc.Othercompanyandproductnamesmaybe trademarksoftherespectivecompanieswithwhichtheyareassociated. (c)2016InvenSense,Inc.Allrightsreserved. DocumentNumber:AN000048 Revision:1.1 Page3of3