标签: hm9270d

HM9270DHM9270C/DDTMFRECEIVERGeneralDescriptionTheHM9270C/DisacompleteDTMFreceiverintegratingboththebandsplitfilteranddigitaldecoderfunctions.Thefiltersectionusesswitchedcapacitortechniquesforhigh-andlow-groupfiltersanddial-tonerejection.Digitalcountingtechniquesareemployedinthedecodertodetectanddecodeall16DTMFtonepairsintoa4-bitcode.Externalcomponentcountisminimizedbyon-chipprovisionofadifferentialinputamplifier,clock-oscillatorandlatched3-statebusinterface.FeaturesCompletereceiverinan18-pinpackage.Excellentperformance.CMOS,single5voltoperation.Minimumboardarea.Centralofficequality.Lowpowerconsumption.Power-Downmode(HM9270Donly).Inhibit-mode(HM9270Donly).PinConfigurationsHM9270……