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F113F113300MHz-to-450MHzLow-Power,Crystal-BasedASKTransmitterGeneralDescriptionTheF113isahighperformance,easytouse,singlechipASKTransmitterICforremotewirelessapplicationsinthe300to450MHzfrequencyband.ThistransmitterICisatrue“data-in,antenna-out”monolithicdevice.F113hasthreestrongattributes:powerdelivery,operatingvoltageandoperatingtemperature.Intermsofpower,theF113iscapableofdelivering+10dBmintoa50Ωload.Thispowerlevelenablesasmallformfactortransmitter(lossyantenna)suchasakeyfobtransmittertooperatenearthemaximumlimitoftransmissionregulations.Intermsofoperatingvoltage,theF113operatesfrom1.8Vto3.6V.ManytransmitterICsinthesamefrequencybandstopoperatingbelow2.0V.TheF113willworkwithmostbatteriestotheendoftheirusefullimits.Intermsofoperatingtemperature,theF113operatesfrom-40°Cto+85°C.TheF113iseasytouse.Itrequiresareferencefrequency(RFcarrierfrequencydividedby32times)generatedfromacrystalwithafewadditionalexternalpartstocreateacompleteversatiletransmitter.TheF113operateswithASK/OOK(AmplitudeShiftKeying/On-OffKeyed)UHFreceivertypesfromwide-bandsuper-regenerativeradiostonarrow-band,highperformancesuper-heterodynereceivers.TheF113’smaximumASKdatarateis10kbps(ManchesterEncoding).TheF113transmittersolutionisidealforindustrialandconsumerapplicationswheresimplicityandformfactorareimportant.Features•CompleteUHFtransmitter•Frequencyrange300MHzto450MHz•Dataratesupto10kbpsASK•OutputPowerto10dBm•Lowexternalpartcount•1.8Vto3.6VSingle-SupplyOperation•Lowvoltageoperation(downto1.8V)•Operatewithcrystalsorceramicresonators•Small3mmx3mm6-PinSOT23PackageApplications●FanControllers●RemotePowerSwitches●Multi-MediaRemoteControl●RemoteSensorDataLinks●InfraredTransmitterReplacementOrderingInformationPartNumberTemp.RangePackageF113-40°Cto+85°CSOT23-6F113TypicalApplicationFigure1.F113ASKKeyFobDesignfor315MHzand433.92MHzNote:Valuesindicatedinparenthesesarefor315MHzPinConfigurationPinDescriptionF113F113estCircuitTFigure2.F113TestCircuitFunctionalDiagramFigure3.FunctionalBlockDiagramF113FunctionalDescriptionFigure3isafunctionalblockdiagramoftheF113transmitter.TheF113isbestdescribedasaphaselockedtransmitter.TheF113systemispartitionedintofivefunctionalblocks:PLL×32PowerampliferEnablecontrolUndervoltagedetectionCrystalOscillatorThereferenceoscillatoriscrystal-basedPiercecon?guration,designedtoacceptcrystalswithfrequencyfrom9.375MHzto14.0625MHz.F113CrystalOscillatorParametersforASKOperationFigure4showsareferenceoscillatorcircuitconfgurationforASKoperation.ThereferenceoscillatoriscapableofdrivingcrystalswithESRrangefrom20Ωto300ΩWhentheESRofcrystalisat20Ωthecrystalparameterlimitsare:ESR20ΩCpar2to10pFCmo10to40fFPLL×32ThefunctionofPLL×32istoprovideastablecarrierfrequencyfortransmission.Itisadivideby32phaselockedlooposcillator.PowerAmplifierThepoweramplifierservestwopurposes:1)tobuffertheVCOfromexternalelementsand2)toamplifythephaselockedsignal.Thepoweramplifiercanproduce+10dBmat3V(typical).EnableControlEnablecontrolgatestheASKdata.ItonlyallowstransmissionwhenLock,AmplitudeandUnderVoltageDetectconditionsarevalid.UnderVoltageDetectUndervoltagedetectblocksensesoperatingvoltage.Iftheoperatingvoltagefallsbelow1.6V,undervoltagedetectblockwillsendasignaltoenablecontrolblocktodisablethePA.ApplicationInformationFigure6.ASK433.92MHzand(315MHz)NentslabeledNParenotplaced.2otes:1.Compon.Valueswithoutparenthesesarefor433.92MHzandvaluesinparenthesesarefor315MHz.3.ValueofR7isselectedtovarytheoutputpower.F113PackageInformation6-PinSotPackageType(SOT23-6)Notes:1.(L)meansLeadFree.2.TheLeadFreemarkisplacedin-frontofthedatecode.