MICRF011英文芯片资料

MicrelInc.•1849FortuneDriveSanJose,Ca95131•USA•tel[phone]•fax[phone]•(ON-OFFKeyed)ReceiverICforremotewirelessapplications,employingMicrel’slatestQwikRadiotmtechnology.Thisdeviceisatrue“antenna-in,data-out”monolithicdevice.AllRFandIFtuningisaccomplishedautomaticallywithintheIC,whicheliminatesmanualtuningandreducesproductioncosts.Receiverfunctionsarecompletelyintegrated.Theresultisahighlyreliableyetextremelylowcostsolutionforhighvolumewirelessapplications.BecausetheMICRF011isatruesingle-chipradioreceiver,itisextremelyeasytoapply,minimizingdesignandproductioncosts,andimprovingtimetomarket.TheMICRF011isafunctionalandpinequivalentupgradetotheMICRF001,providingimprovedrange,lowerpowerconsumption,andhigherdataratesupportwheninFIXEDmode.TheMICRF011providestwofundamentalmodesofoperation,FIXEDandSWP.InFIXEDmode,thedevicefunctionslikeaconventionalsuperheterodynereceiver,withan(internal)localoscillatorfixedatasinglefrequencybasedonanexternalreferencecrystalorclock.Aswithanyconventionalsuperheterodynereceiver,thetransmitfrequencymustbeaccuratelycontrolled,generallywithacrystalorSAW(SurfaceAcousticWave)resonator.InSWPmode,theMICRF011sweepsthe(internal)localoscillatoratratesgreaterthanthebasebanddatarate.Thiseffectively“broadens”theRFbandwidthofthereceivertoavalueequivalenttoconventionalsuper-regenerativereceivers.ThustheMICRF011canoperatewithlessexpensiveLCtransmitterswithoutadditionalcomponentsortuning,eventhoughthereceivertopologyisstillsuperheterodyne.Inthismodethereferencecrystalcanbereplacedwithalessexpensive±0.5%ceramicresonator.Allpost-detection(demodulator)datafilteringisprovidedontheMICRF011,sonoexternalfiltersneedtobedesigned.Anyoneoffourfilterbandwidthsmaybeselectedexternallybytheuser.Bandwidthsrangeinbinarysteps,from0.625kHzto5kHz(SWPmode)or1.25kHzto10kHz(FIXEDmode).Theuseronlyneedstoprogramtheappropriatefilterselectionbasedondatarateandcodemodulationformat.Features•CompleteUHFreceiveronamonolithicchip•Frequencyrange300to440MHz•Typicalrangeover200meterswithmonopoleantenna•Dataratesto2.5kbps(SWP),10kbps(FIXED)•Automatictuning,nomanualadjustment•NoFiltersorInductorsrequired•LowOperatingSupplyCurrent—2.4mAat315MHz•FullypincompatiblewithMICRF001•VerylowRFre-radiationattheantenna•DirectCMOSlogicinterfacetostandarddecoderandmicroprocessorICs•ExtremelylowexternalpartcountApplications•GarageDoor/GateOpeners•SecuritySystems•RemoteFan/LightControlIMPORTANT:ItemsinboldtyperepresentchangesfromtheMICRF001specification.DifferencesbetweentheMICRF001and-011areidentifiedintable2,togetherwithdesignconsiderationsforusingthe-011inpresentMICRF001designs.TypicalOperatingCircuit385.5MHz,1200bpsOOKRECEIVERQwikRadiotm2December1998bMICRF011MICRF011MicrelOrderingInformationPartNumberTemperatureRangePackageMICRF011BN-40°Cto+85°C14-PinDIPMICRF011BM-40°Cto+85°C14-PinSOICPinConfiguration(DIPandSOIC)PinDescriptionPinNumberPinNamePinFunction1SEL0ProgramsdesiredDemodulatorFilterBandwidth.Thispinininternallypulled-uptoVDD.SeeTable1.2/3VSSRFThispinisthegroundreturnfortheRFsectionoftheIC.ThebypasscapacitorconnectedfromVDDRFtoVSSRFshouldhavetheshortestpossibleleadlength.Forbestperformance,connectVSSRFtoVSSBBatthepowersupplyonly(i.e.,keepVSSBBcurrentsfromflowingthroughVSSRFreturnpath).4ANTThisisthereceiveRFinput,internallyac-coupled.Connectthispintothereceiveantenna.Inputimpedanceishigh(FETgate)withapproximately2pFofshunt(parasitic)capacitance.Forapplicationslocatedinhighambientnoiseenvironments,afixedvalueband-passnetworkmaybeconnectedbetweentheANTpinandVSSRFtoprovideadditionalreceiveselectivityandinputoverloadprotection.(See“ApplicationNote22,MICRF001TheoryofOperation”.)5VDDRFThispinisthepositivesupplyinputfortheRFsectionoftheIC.VDDBBandVDDRFshouldbeconnecteddirectlyattheICpins.ConnectalowESL,lowESRdecouplingcapacitorfromthispintoVSSRF,asshortaspossible.6VDDBBThispinisthepositivesupplyinputforthebasebandsectionoftheIC.VDDBBandVDDRFshouldbeconnecteddirectlyattheICpins.7CTHThiscapacitorextractsthe(DC)averagevaluefromthedemodulatedwaveform,whichbecomesthereferencefortheinternaldataslicingcomparator.Treatthisasalow-passRCfilterwithsourceimpedanceof118kohms(forREFOSCfrequencyft=4.90MHz).Notethatvariationinsourceresistancewithfilterselectionnolongerexists,asitdoesfortheMICRF001.(See“ApplicationNote22,MICRF001TheoryofOperation”,section6.4).Astandard±20%X7Rceramiccapacitorisgenerallysufficient.8DOOutputdatapin.CMOSlevelcompatible.9/10VSSBBThisisthegroundreturnforthebasebandsectionoftheIC.ThebypassandoutputcapacitorsconnectedtoVSSBBshouldhavetheshortestpossibleleadlengths.Forbestperformance,connectVSSRFtoVSSBBatthepowersupplyonly(i.e.,keepVSSBBcurrentsfromflowingthroughVSSRFreturnpath).11CAGCIntegratingcapacitorforon-chipreceiveAGC(AutomaticGainControl).TheDecay/Attacktime-constant(TC)ratioisnominallysetas10:1.Useof0.47μForgreaterisstronglyrecommendedforbestrangeperformance.See“