STX210AOOK/ASK/TransmitterDescriptionSTX210AisoneOOK/ASKtransmitterwithintegratedtransmittingdataencoder.Thecircuitworkingfrequencyrangeisabout200MHz-500MHz.Theencoderhassingleexternalinputenablepin.ThetransmittedbitpatternisconsistentwithXX1527encoder.STX210Aintegratesmosttransmittercomponentson-chipandonlyrequiresafewexternalcomponentstoworkasatransmitter.TheSTX210Ahastransmissiondataencoder,lowsupplydetection,andlong-timemis-transmissionshutdownprotectionfeatures.FeaturesWorkingfrequencyrange：200MHz-500MHz.•Tunableoutputpower:15dBm@5Vwith50ohmload,typ.•TransmitteddatapatternconsistentwithXX1527encoder.•Widesupplyvoltage:2.3V-5.5Vfor315/433MHz.•Lowsupplyvoltagedetection•AutomaticshutdownprotectionApplications•WirelessDoor-bell.•RemoteControl,Garagedoorandgateopeners•AMR-AutomaticMeterReading•Wirelessalarmandsecuritysystem.BlockDiagram锐迪芯电子STX210AOOK/ASK/TransmitterPinConfigurationTable1.PinDescriptionPinSymbolI/ODescription1VSSAIORFGound2POUTOTransmittedRFoutput,canstand20VDCvoltage.3VDCCLDOPowerfordigpart,connectedextbypasscap.4RATEIOExtconnectedres，ControlTXdatarate5D1ITransmitinputcontrol,activehigh,defaultlow6VACCIOLDOPowerforRFpart,connectedextbypasscap.7VDDAIOVddforwholchip8XIIInputterminaloflocaloscillationsignal.Itisconnectedtothecrystalordrivenbyanexternalclock.Table2.AbsoluteMaximumRatingItemRatingSupplyVoltage,VDD+5.6VInputsandClockOutputs-0.5Vto+5.6VPoutpin-0.5Vto+20VStorageTemperature-65to+150oCSolderingTemperature+260oCSTX210AOOK/ASK/TransmitterTable3.ElectricalSpecificationsParameterSymbolTestConditionMinTypMaxUnitSupplyV2.25.5VVoltage200MHz-500MHzDDSupplyIFout=434MHz,13dBm,3V15mACurrentDDFout=434MHz,18dBm,5V25mARFPowerPratio200MHz-500MHzdBOn/OffRatio60PoutsupplyPvol200MHz-500MHz12VvoltageTransmittedPoutFin=315MHz,Vdd=5V20dBmPowerFin=434MHz,Vdd=5V20dBmDataRateOOK/ASKmode0.520Kb/sOSCIoperatingF91020MHzFrequencyOSCOperatingT-402785℃TemperatureaLeakageIPowerdownmode1uACurrentSBTypicalApplicationCircuitI—315/433MHzTransmitterSTX210AOOK/ASK/TransmitterFunctionalDescriptionCrystalOscillatorThecrystaloscillatorcircuitconsistsofacolpitoscillator.Pin8candriveoneoff-chip9MHz-30MHzcrystalwithoutexternalcapacitorsrequired.ThedrivingcapacitorsareintegratedonChip.Thecrystaldriverstagecanalsotakeinputclockasinputclockbuffer.Thecrystaloscillatorfrequencyisdeterminedasfollowsfosc=fvco/32WhereFvcoisVCOoscillationfrequency.32isPLLdividervalue.BelowtableliststherequiredCrystalfrequency.ThesuggestedcrystalESRmustbelessthan50Ω.TransmittingFrequencyCrystalFrequencyNote(MHz)(MHz)3159.84434010.62539012.188433.9213.56PLLBlockThePLLconsistsofphase-frequencydetector(PFD),chargepump,loopfilter,voltage-controlledoscillator(VCO),anddivider(32).ThePFDcomparestwosignalsandproducesanerrorsignalwhichisproportionaltothetwosignalphasedifference.TheerrorsignalisusedtocontroltheVCOtorunfastorslow.TheVCOoscillationfrequencyrangeistunablebetween200MHz-500MHz.OOK/ASKModulationTheOOK/ASKmodulationisdonebyexternalPinD1.D1turnon/offthepoweramplifierwhenD1ishighorlow.ThePLLloopisonnomatterDINishighandlow.However,tosavepower,thewholechipisturnedoffafterD1stayinlowoveronemillioncrystaloscillationcycles.Thatisabout100msfor10MHzcrystal.WhenD1ishigh,thewholechipispoweredup.TheOn/Offpowerratioislargerthan60dB.STX210AOOK/ASK/TransmitterTXRATECONTROLThetransmittingrateiscontrollablewithexternalcontrolpinRATEconnectedwithdifferentresistor.Belowtableliststhetransmittingratewithdifferentextresistor.Thebitratechangeslesswithsupplyvoltage.TablexThetransmittingtimevsexternalresistorwhenpinsD1isholdathigh.ExtResistorVcc=2.5V,Vcc=2.5V,note(K.Ω)1TBitwidthBitRate(ms),(kb/s)2200.128.03300.166.04700.254.06900.343.010000.502.0Fig.1TransmittingbitratevsSupplyvoltageandextbiasresistor.STX210AOOK/ASK/TransmitterRFOUTPUTTheANTpincanbematchedto50OhmwithaΠ-typecircuit.Thesupplyvoltagecanbeashighas12V.Belowtableissuggestedinductorandcapacitorvaluefordifferentfrequency.FrequencyL1L2C1C2C3C4R1Note(MHz)(nH)(nH)(uF)(pF)(pF)(pF)(Ω)3154701001.0NCNC10100433470821.0NCNC5100ENCODERThechipintegratesthecontroldataencoder.ThetransmitteddatapatternisencodedwithintheinternalOTPencoder.ThedatapatternisconsistentwithmarketavailableproductXX1527.STX210AOOK/ASK/TransmitterPackageInformationSOP-8
