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1、MEMSMic.DesignGuideMEMSMicrophoneVer0.3SANICOELECTRONICS2013.JulySoundPortDesign(RubberandPCB)Φ0.25SoundportofMEMSMic.SoundportofMEMSMic.Soundportofrubber[FronttypeMEMSMMic.][ReartypeMEMSMMic.]?SoundportdiameterofrubbershouldbewiderthanΦ0.8nottocoverthesoundportofMEMSmicrophoneo
2、ffronttype.?SoundportdiameterofPCBshouldbewiderthanΦ0.4forreartypeMEMSmicrophone-2-SANICOElectronics-2-ConfidentialDocumentSMTPick-upAreaPick-uparea?WhenMEMSmicrophoneismountedonhardtypePCBorflexiblePCB,pick-upnozzleshouldcatchthepick-upareaofMEMSmicrophone.-3-SANICOElectronics-
3、3-ConfidentialDocumentMEMSMic.AssemblyinHousingHousingGasketMEMSMic.HousingRubberWallMEMSMic.?Topreventhowling,MEMSmicrophoneshouldbeattachedhousingtightly.Usingrubberorgasketwouldbehelpfulforpreventinghowling.?IfhousinghaswallstructuretofixMEMSmicrophone,rubbermustbeusedforreli
4、ability.OrelseMEMSmicrophonewouldbepossiblydetachedfromPCBwhenhousingisdroppedonasurface.-4-SANICOElectronics-4-ConfidentialDocumentMEMSMic.MountonF-PCBF-PCBStiffener?WhenMEMSMic.IsmountedonF-PCB,theremustbemorethan5mmspacebetweenanyedgeofF-PCBandMEMSMic..?InordertomountMEMSmicr
5、ophoneonF-PCB,stiffenershouldbeaddedtoF-PCBanditmustbethickerthan0.25mm.-5-SANICOElectronics-5-ConfidentialDocumentTapingofGasketTape[Tapepatternexamples]?Tape,forattachinggasketonMEMSmicrophonecover,shouldnotcoverMEMSmicrophonesoundport.-6-SANICOElectronics-6-ConfidentialDocume
6、ntStencilPatternExample[FronttypeMEMSMMic.][ReartypeMEMSMMic.]-7-SANICOElectronics-7-ConfidentialDocumentRecommendedCircuitforEar-setRecommendedSidePartsValueRac=1.8?Rdc<15?RL=2.2?C1=1?FLPF=1/(2π*C1*Rac)SEFF=SMIC*(RL/Rac)C1*FLPF:Lowpassfilterfrequency*SEFF:Effectivesensitivity*S
7、MIC:MicrophonesensitivityAOS3729A-T42RdcRacNote+Biasvoltage(Vbias)canaffecttheoperationofaboverecommendedcircuit.+Forsensingofear-setplugin,iftheapplicationset(mobilephoneortableetc..)checkdifferenceofcurrentlevel,aboverecommendedcircuitcouldoperateincorrectly.-8-SANICOElectroni
8、cs-8-ConfidentialDocumentDifferentialOutputAMEM
