TRF3710EVM;中文规格书,Datasheet资料

User'sGuide

SLAU224–July2007

TRF3710EVMThisistheuser’sguidefortheTRF3710EVM.TheTRF3710isareceiverdirectdownconvertquadraturedemodulatorthatincludesprogrammablebasebandfilters,adjustabledcoffsetcorrection,andbufferamplifierstodirectlydriveADCs.ThedeviceissuitedforoperationwithCDMAandWCDMAmodulationaswellaswithWiMAX™signals.

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Introduction...................................................................................................................1.1EVMFrequencyConfigurationOptions..........................................................................1.2SystemBlockDiagram.............................................................................................SoftwareControl.............................................................................................................2.1InstallationInstructions.............................................................................................2.2SoftwareOperation.................................................................................................EVMTestConfiguration.....................................................................................................3.1TestBlockDiagram.................................................................................................3.2TestEquipment.....................................................................................................3.3Calibration...........................................................................................................BasicTestProcedure.......................................................................................................4.1InitialInspection.....................................................................................................4.2DCTest..............................................................................................................4.3BasicRFTest.......................................................................................................4.4AdvancedRFTest..................................................................................................OptionalConfigurations.....................................................................................................5.1MixerOutputs.......................................................................................................5.2CommonModeVoltage............................................................................................5.3DCOffsetControl...................................................................................................5.4AnalogGainControl................................................................................................5.5AnalogDeviceDisable.............................................................................................ListofFigures

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SystemBlockDiagram......................................................................................................TRF3710GUIFrontPanel..................................................................................................TestSet-upBlockDiagram.................................................................................................TRF371xWithADS5232WiMAX3.5MHzSignalEVMPerformance................................................ListofTables

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FrequencyAllocations.......................................................................................................5

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Contents

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Introduction

11.1

Introduction

EVMFrequencyConfigurationOptions

TheTRF3710deviceisinherentlybroadband;however,theRFinputandLOinputrequiredifferential

inputwhichisgenerallyachievedwiththeuseofanRFbalun.TheEVMcanbeconfiguredwithadifferentbaluntofacilitateoperationinthedesiredband.InspecttheboardatR101,R102,andR103todeterminewhichbalunispopulatedontheboard.

1.2SystemBlockDiagram

ThebasicradiosystemblockdiagraminFigure1demonstrateswheretheTRF3710fitsintheoverallreceiver.TheboldboxhighlightstheTRF3710device.

ADS5231TRF371x12090LNA12TRF3761Figure1.SystemBlockDiagram

22.1

SoftwareControlInstallationInstructions

•••••

OpenfoldernamedTRF3710_GUI_Installer_Verxpx.fdr(xpxrepresentsthelatestversion)RunSetup.exe

Followtheon-screeninstructions

Onceinstalled,launchbyclickingontheTRF3710_GUIprogram

WhenpluggingintheUSBcableforthefirsttime,theuserispromptedtoinstalltheUSBdrivers.–Whenapop-upscreenopens,selectContinueDownloading.–FollowtheonscreeninstructionstoinstalltheUSBdrivers

–Ifneeded,theusercanaccessthedriversdirectlyintheinstalldirectory

2.2SoftwareOperation

ThefrontpanelcontrolisshowninFigure2.Theregistersaresetintheirdefaultconfiguration.Thefunctionalityofthecontrolregistersisdescribedbelow.

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SoftwareControl

2.2.1

••

Register0BBGain:BBFreqCtrl:

SetsthegainofthePGA(ProgrammableGainAmplifiers);rangeis0to24.

SetsthebandwidthoftheBBfilters.Setting7isgenerallysuitedforWCDMAapplications.Setting90isgenerallysuitedforCDMAapplications.Seedatasheetforcomprehensivecurves.

Selectssourceforcommonmodevoltageadjustment;Digitalsettingallowsinternalregisterstofulfillthisfunction.

ResetstheinternallystoreddcoffsetvaluesforIandQbackto128.IfOn,itallowstheReadbacktobeenabled.

WhenOn,theinternalIandQDACDCoffsetsettingsarereadback(onlyinAutoCal=Automode)

•••••

PWD_Mix/LO/Buf1/Filt/Buf2:EnablesSWcontrolledpowerdownofrespectivestagesinsidedevice.DCOffsetCal:CalReset:Readback:ReadbackEn:

2.2.2

•••••••

Register1AutoCalAutoCalEn:I/QDAC:I/QDet:CalClkSel:Osc.Freq.ClkDiv:

ManualmodeallowstheDCoffsetDACstobeuserconfigurable;Automodeusestheinternallystoredvalues.

Whentoggled,anAutoCalisinitiated.Note,AutoCalmustbeinAutomode.ShowsthesettingofthedcoffsetIandQDAC;rangeis0to255.SelectstheresolutionoftheIandQDAC.

TogglebetweenusinganexternallysuppliedSPIclockorinternaloscillatorclock.Selectstheoscillatorfrequencyfortheinternalclock.

Setstheclockdividerifthecontrolclocksneedtobesloweddown.

2.2.3

•

Register2MxrI/QOffA/B:

SelectsthemixergainforthedifferentialBBpaths.Typically,theseregistersneednomodification.

2.2.4

••

MiscSettingsResetUSB:WriteRegs:

TogglethisbuttoniftheUSBportisnotresponding.ThisgeneratesanewUSBhandleaddress.

Theregistersareallwrittenaftereachmodificationinthefrontpanel;however,theusercantogglethisbuttontoensurealltheregistersareloadedasseenonthescreen.

Showsthe32-bitwordthatissentforeachregister.ShowstheUSBpin-outselectionStopstheprogram

•••

ShowBytes:ShowParPort:Stop:

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EVMTestConfiguration

Figure2.TRF3710GUIFrontPanel

33.1

EVMTestConfigurationTestBlockDiagram

Thetestset-upforgeneraltestingoftheTRF3710isshowninFigure3.ComputerTerminalSignal󰀀GeneratorRFJ1J6DUTJ3J7J10SpectrumAnalyzerSignal󰀀GeneratorLOJ11J12Power5VSupplyGndFigure3.TestSet-upBlockDiagram

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BasicTestProcedure

3.2TestEquipment

ThefollowingequipmentisrequiredforcompletingRFTesting:•••••

PowerSupplywithCurrentReadoutSignalGeneratorforinputsignalSignalGeneratorforLOsignalSpectrumAnalyzerProgrammingComputer

AgilentE3631orEquivalentAgilentE4438CorEquivalentAgilentE4438CorEquivalentAgilentE4440AorEquivalent

3.3Calibration

TheRFcablesshouldbegoodqualityRFcablesduetothehighfrequencysignals.

•MeasuretheinsertionlossoftheRFinputcableandusethisvaluetocompensateforthedesiredinputpower.Note,thereisapproximately1dBofinsertionlossfortheinputtracesandbalunonthePCBboard.

•MeasuretheinsertionlossoftheLOinputcableandusethisvaluetocompensateforthedesiredLOpower.Note,thereisapproximately1dBofinsertionlossfortheinputtracesandbalunonthePCBboard.

•BBLossfactor:Ifusingtheon-boardtransformerstointerfacewith50-Ωtestequipment,thenthereisapproximately12.3dBoflossassociatedwiththevoltagetransformation.

4BasicTestProcedure

ThissectionoutlinesthebasictestprocedurefortestingtheEVM.Thissectionisdividedintothreetestsections:DCandProgrammability,BasicCWRF,andAdvancedRFTesting.Thefirstsectionrequiresonlypowersupplywithcurrentreadoutandacomputerforprogrammability.ThesecondsectionrequiresbasicRFtestequipmentandbasictechnicalknow-how.Thethirdsectionisforreferenceandrequiresspecializedequipmentandset-up.Onlysectionsoneandtwoarerequiredtoensurebasicfunctionality.

4.1InitialInspection

DeterminewhichbalundeviceisplacedontheboardbyinspectingwhichjumperresistorisinstalledattheR101,R102,andR103locations.ThisinformationdeterminestheproperRFfrequenciesforwhichtheboardisset.

Table1.FrequencyAllocations

Band1G92G43G5

FrequencyBand1800–2000MHz2.3–2.7GHz3.5–3.8GHz

F_LO1.9GHz2.4GHz3.5GHz

F_RF1.9GHz2.4GHz3.5GHz

4.2DCTest

•••

Connect5VtoJ11;connectgroundtoJ12.Engagepowersupplies.Verifycurrentis365±25mA

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BasicTestProcedure

4.3BasicRFTest

••••••••••••

InjectLOsignalatJ7atF_LOfrequencyat0dBm.CompensateforRFcablelosses,includingabout1dBforinputbalunandtransmissionlinelosses.VerifyUSBcableisconnected.

LaunchTRF3710EVM_GUI.SelectWriteRegstoverifyprogrammingtotheboard.SelectCLKDivto256.

ToggleAutoCalEnontheGUI.VerifythatnoRFsignalinpresent.

MonitorthedcvoltageareTP2(IA)andTP7(IB)andbetweenTP10(QA)andTP12(QB)andverifythatthedcoffsetvoltageis0±15mV.

InjectRFsignalatJ6atF_RF+300kHzat–40dBm.Compensateforcablelossincludingabout1dBforinputtransmissionlinelossesandbalun.ConnectSpectrumAnalyzeratJ3(I).

SetSpectrumanalyzercenterfrequencyto300kHz;setspanto500kHz;setreferencelevelto0dBm;setanalyzertodccoupling.

Measuresignalat300kHzandverifysignalat–9.3dBm±2dB.Note,thereisnocompensationfortransformerloss.

AdjustBBGainto20;verifysignalreduces4dB±1dB.

SwitchoutputcabletoJ10(Q)andrepeattheprocedureabove.

4.4AdvancedRFTest

TheEVMisequippedwiththedifferentialoutputsgoingtoa16:1transformerforinterfacingwith50-Ωtestequipment.ThisconfigurationissuitableforcompletingbasicRFtestevaluationofthedevice;however,theinherenthighpassnatureofatransformerwilllimitperformanceatfrequenciesclosetodc.Asa

result,thisconfigurationisnotsuitableforanalyzingtruemodulatedsignals.Asanalternative,theportsatJ2,J4,J8,J13offerdirectaccesstothedriverampoutputsforthedifferentialIandQsignalsrespectively.Note,theseportscannotdrive50-Ωtestequipmentdirectly.Forbestperformance,theconnectionstothetransformershouldbeseveredbyremovingcapacitorsC5,C8,C33,C35.

TheseportscandriveintoanADCdirectlyorintoahighimpedancedifferentialamplifier.TheseportsaredccoupledtoprovidethepropercommonmodeoffsetvoltagetotheADC.ThetypicalEVMperformanceofthedeviceusingamodulated3.5MHzwideWiMAXsignalcapturedbytheADCisshowninFigure4.6TRF3710EVM

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BasicTestProcedure

Figure4.TRF371xWithADS5232WiMAX3.5MHzSignalEVMPerformance

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OptionalConfigurations

55.1

OptionalConfigurationsMixerOutputs

ThemixeroutputscanbefeddirectlytothetransformersandtoportsJ5andJ9.ThiscanbeusefulformeasuringtheRFperformanceofthemixeritselfwithoutthePGAsorfilters.ThisfeatureisimplementedbytogglingthePWD_Buf1toON.

5.2CommonModeVoltage

Thecommonmodevoltageissettoastatic1.5Vbyaresistordividernetwork.Note,thecommonmodevoltageareshiftediftheinputsupplyisnot5V.Alternatively,thisiscontrolledviaaresistivepotby:•RemovingR11,R12,R17,R18.

•Placing0Ωjumperat:R10andR20.•AdjustingpotsatR13andR19.

WhencascadingthedevicewithanADCitmaybedesirabletofeedthecommonmodevoltagefromtheADCtothedevice.Thiscanbeaccomplishedby:•RemovingshuntatW1andW3.

•PlacingADCcommonmodevoltageatTP8andTP9.

5.3DCOffsetControl

TheeasiestwaytomanagethedcoffsetcontrolistousetheAutoCalfunction.ThisisaccomplishedbyselectingAutoCaltoAutoandtogglingtheAutoCalEnswitch.MonitorthedcoffsetvoltageatTP2(IA)andTP7(IB)andbetweenTP10(QA)andTP12(QB)andverifythattheprocedureworkedsufficiently.TheusermayalsoselectReadbacktoOnandReadbackEntoOnandfindthevaluesoftheIandQDACregistersontheGUI.

IftheRFinputsignalisdisengagedduringtheauto-calprocedure,thenthedetectionfilterbandwidthcanremainat10MHzandtheclockdividercanremainat1.Theclockdividercanbechangedto256toprovidesufficientaveragingforthedetectortoyieldsuperiorresults.IftheRFinputsignalisapplied,reducethedetectionfilterbandwidthto1kHzandincreasetheclockdividerto1024toincreasethedetectoraveraging.

Alternatively,thisfunctioncanbeaccomplishedbymanuallyprogrammingtheIandQDACregisters.ToggleAutoCaltoManual.AdjusttheIandQDACregistersontheGUIdirectly.MonitorthedcoffsetvaluesatTP2(IA)andTP7(IB)andbetweenTP10(QA)andTP12(QB)untilthedcoffsetisascloseto0mVaspossible.

Athirdoptionistoadjustthecommonmodethroughananalogvoltage.TheEVMisequippedwithtwopotsatR6andR24thatcontrolthisvoltage.OntheGUI,changetheDCOffsetCaltoAnalogandadjustthepotsatR6andR24whilemonitoringtestpointsatTP2,TP7,TP10,TP12togetdcoffsetnear0mV.

5.4AnalogGainControl

ThedeviceisequippedwiththreebitstocontrolthePGAgaintofacilitateananaloggaincontrolloopthatdoesnotrequiretheuseofSPI.Tousethisfunction,settheBBGainontheGUIto17.Thenadjustforthelast7statesthroughthebinarycombinationofbitsB0,B1,B2thatcanbetoggledatDIPswitchSW1.

5.5AnalogDeviceDisable

ThedevicecanbedisabledbyremovingjumperatW2.

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EVALUATIONBOARD/KITIMPORTANTNOTICE

TexasInstruments(TI)providestheenclosedproduct(s)underthefollowingconditions:

Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATIONPURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Personshandlingtheproduct(s)musthaveelectronicstrainingandobservegoodengineeringpracticestandards.Assuch,thegoodsbeingprovidedarenotintendedtobecompleteintermsofrequireddesign-,marketing-,and/ormanufacturing-relatedprotectiveconsiderations,includingproductsafetyandenvironmentalmeasurestypicallyfoundinendproductsthatincorporatesuchsemiconductorcomponentsorcircuitboards.Thisevaluationboard/kitdoesnotfallwithinthescopeoftheEuropeanUniondirectivesregardingelectromagneticcompatibility,restrictedsubstances(RoHS),recycling(WEEE),FCC,CEorUL,andthereforemaynotmeetthetechnicalrequirementsofthesedirectivesorotherrelateddirectives.

Shouldthisevaluationboard/kitnotmeetthespecificationsindicatedintheUser’sGuide,theboard/kitmaybereturnedwithin30daysfromthedateofdeliveryforafullrefund.THEFOREGOINGWARRANTYISTHEEXCLUSIVEWARRANTYMADEBYSELLERTOBUYERANDISINLIEUOFALLOTHERWARRANTIES,EXPRESSED,IMPLIED,ORSTATUTORY,INCLUDINGANYWARRANTYOFMERCHANTABILITYORFITNESSFORANYPARTICULARPURPOSE.

Theuserassumesallresponsibilityandliabilityforproperandsafehandlingofthegoods.Further,theuserindemnifiesTIfromallclaimsarisingfromthehandlingoruseofthegoods.Duetotheopenconstructionoftheproduct,itistheuser’sresponsibilitytotakeanyandallappropriateprecautionswithregardtoelectrostaticdischarge.

EXCEPTTOTHEEXTENTOFTHEINDEMNITYSETFORTHABOVE,NEITHERPARTYSHALLBELIABLETOTHEOTHERFORANYINDIRECT,SPECIAL,INCIDENTAL,ORCONSEQUENTIALDAMAGES.

TIcurrentlydealswithavarietyofcustomersforproducts,andthereforeourarrangementwiththeuserisnotexclusive.

TIassumesnoliabilityforapplicationsassistance,customerproductdesign,softwareperformance,orinfringementofpatentsorservicesdescribedherein.

PleasereadtheUser’sGuideand,specifically,theWarningsandRestrictionsnoticeintheUser’sGuidepriortohandlingtheproduct.Thisnoticecontainsimportantsafetyinformationabouttemperaturesandvoltages.ForadditionalinformationonTI’senvironmentaland/orsafetyprograms,pleasecontacttheTIapplicationengineerorvisitwww.ti.com/esh.NolicenseisgrantedunderanypatentrightorotherintellectualpropertyrightofTIcoveringorrelatingtoanymachine,process,orcombinationinwhichsuchTIproductsorservicesmightbeorareused.

FCCWarning

Thisevaluationboard/kitisintendedforuseforENGINEERINGDEVELOPMENT,DEMONSTRATION,OREVALUATIONPURPOSESONLYandisnotconsideredbyTItobeafinishedend-productfitforgeneralconsumeruse.Itgenerates,uses,andcanradiateradio

frequencyenergyandhasnotbeentestedforcompliancewiththelimitsofcomputingdevicespursuanttopart15ofFCCrules,whicharedesignedtoprovidereasonableprotectionagainstradiofrequencyinterference.Operationofthisequipmentinotherenvironmentsmaycauseinterferencewithradiocommunications,inwhichcasetheuserathisownexpensewillberequiredtotakewhatevermeasuresmayberequiredtocorrectthisinterference.

MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265

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EVMWARNINGSANDRESTRICTIONS

ItisimportanttooperatethisEVMwithintheinputvoltagerangeof5V0.5Vandtheoutputvoltagerangeof5V0.5V.

Exceedingthespecifiedinputrangemaycauseunexpectedoperationand/orirreversibledamagetotheEVM.Iftherearequestionsconcerningtheinputrange,pleasecontactaTIfieldrepresentativepriortoconnectingtheinputpower.

Applyingloadsoutsideofthespecifiedoutputrangemayresultinunintendedoperationand/orpossiblepermanentdamagetotheEVM.PleaseconsulttheEVMUser'sGuidepriortoconnectinganyloadtotheEVMoutput.Ifthereisuncertaintyastotheloadspecification,pleasecontactaTIfieldrepresentative.

Duringnormaloperation,somecircuitcomponentsmayhavecasetemperaturesgreaterthan85°C.TheEVMisdesignedtooperateproperlywithcertaincomponentsabove85°Caslongastheinputandoutputrangesaremaintained.Thesecomponentsincludebutarenotlimitedtolinearregulators,switchingtransistors,passtransistors,andcurrentsenseresistors.ThesetypesofdevicescanbeidentifiedusingtheEVMschematiclocatedintheEVMUser'sGuide.Whenplacingmeasurementprobesnearthesedevicesduringoperation,pleasebeawarethatthesedevicesmaybeverywarmtothetouch.

MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265

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TIassumesnoliabilityforapplicationsassistanceorcustomerproductdesign.CustomersareresponsiblefortheirproductsandapplicationsusingTIcomponents.Tominimizetherisksassociatedwithcustomerproductsandapplications,customersshouldprovideadequatedesignandoperatingsafeguards.

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amplifier.ti.comdataconverter.ti.comdsp.ti.cominterface.ti.comlogic.ti.compower.ti.commicrocontroller.ti.comwww.ti-rfid.comwww.ti.com/lpwApplicationsAudioAutomotiveBroadbandDigitalControlMilitary

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