搜索
AS3992UHFRFIDSingleChipReaderEPCClass1Gen2CompatibleDataSheet(MCU)andthereaderIC.Whenhardwarecodersanddecodersareusedfortransmissionandreception,dataistransferredvia24bytesFIFOregister.Incaseofdirecttransmissionorreception,codersanddecodersarebypassedandthehostsystemcanservicetheanalogfrontendinrealtime.Thetransmittergenerates20dBmoutputpowerinto50ΩloadandiscapableofASKorPR-ASKmodulation.Theintegratedsupplyvoltageregulatorsensuresupplyrejectionofthecompletereadersystem.Thetransmissionsystemcompriseslowleveldatacoding.AutomaticgenerationofFrameSync,Preamble,andCRCissupported.ThereceiversystemallowsAMandPMdemodulation.Thereceiveralsocomprisesautomaticgaincontroloption(patentpending)andselectablegainandsignalbandwidthtocoverarangeofinputlinkfrequencyandbitrateoptions.ThesignalstrengthofAMandPMmodulationismeasuredandcanbeaccessedinRSSIregister.Thereceiveroutputisselectablebetweendigitizedsub-carriersignalandanyofintegratedsub-carrierdecoders.Selecteddecodersdeliverbitstreamanddataclockasoutputs.Thereceiversystemalsocomprisesframingsystem.ThissystemperformstheCRCcheckandorganizesthedatainbytes.Frameddataisaccessibletothehostsystemthrougha24byteFIFOregister.TosupportexternalMCUandothercircuitrya3.3Vregulatedsupplyandclockoutputsareavailable.Theregulatedsupplyhas20mAcurrentcapability.TheAS3992isavailableina64-pinQFN(9mmx9mm),ensuringthesmallestpossiblefootprint.2KeyFeaturesISO18000-6C(EPCGen2)fullprotocolsupportISO18000-6A,BcompatibilityindirectmodeFullDRMcomplianceonchipallowingatrueWorldWideShippabledeviceImprovedreceivesensitivityto-78dBmOnchippre-distortionmeaningimprovedexternalPAefficiencyIntegratedlowleveltransmissioncoding,IntegratedlowleveldecodersIntegrateddataframing,IntegratedCRCcheckingParallel8-bitorserial4-pinSPIinterfacetoMCUusing24bytesFIFOVoltagerangeforcommunicationtoMCUbetween1.8Vand5.5VSelectableclockoutputforMCUIntegratedsupplyvoltageregulator(20mA),whichcanbeusedtosupplyMCUandotherexternalcircuitryIntegratedsupplyvoltageregulatorfortheRFoutputstage,providingrejectiontosupplynoiseInternalpoweramplifier(20dBm)forshortrangeapplicationsModulatorusingASKorPR-ASKmodulationAdjustableASKmodulationindexAM&PMdemodulationensuringno“communicationholes”withautomaticI/QselectionBuilt-inreceptionlow-passandhigh-passfiltershavingselectablecornerfrequenciesSelectablereceptiongain,ReceptionautomaticgaincontrolADconverterformeasuringTXpowerusingexternalRFpowerdetectorDAconverterforcontrollingexternalpoweramplifierFrequencyhoppingsupportOn-boardVCOandPLLcoveringcompleteRFIDfrequencyrange840MHzto960MHzOscillatorusing20MHzcrystalPowerdown,standbyandactivemode,CanbepoweredbyUSBwithnoneedforstepconversion3ApplicationsThedeviceisanidealsolutionforUHFRFIDreadersystemsandhand-heldUHFRFIDreaders.