ADS1147EVM-PDK;中文规格书,Datasheet资料

User'sGuide

SBAU148B–June2009–RevisedMay2011

ADS1147EVM,ADS1247EVM,ADS1147EVM-PDK,

ADS1247EVM-PDK

ADS1247EVM(Left)andADS1247EVM-PDK(Right)

Thisuser'sguidedescribesthecharacteristics,operation,anduseoftheADS1147EVMandADS1247EVM,bothbythemselvesandaspartoftheADS1147EVM-PDKorADS1247EVM-PDK.Theseevaluationmodules(EVMs)areevaluationboardsfortheADS1247,a24-bitmulti-channel,delta-sigma,analog-to-digitalconverter(ADC),andtheADS1147,pletecircuitdescriptions,schematicdiagrams,andbillofmaterialsareincludedinthisdocument.

ThefollowingrelateddocumentsareavailablethroughtheTexasInstrumentswebsiteat.

EVM-CompatibleDeviceDataSheets

ADCProisatrademarkofMicrosoft,WindowsareregisteredtrademarksofMicrosoftCorporation.I2CisatrademarkofNXPSemiconductors.

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1

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EVMOverview...............................................................................................................3AnalogInterface.............................................................................................................4DigitalInterface..............................................................................................................4PowerSupplies..............................................................................................................5VoltageReference..........................................................................................................6ClockSource................................................................................................................7EVMOperation..............................................................................................................7ADS1247EVM-PDKKitOperation........................................................................................8EvaluatingPerformancewiththeADCProSoftware..................................................................17SchematicsandLayout...................................................................................................29

ListofFigures

Contents

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ReferenceSelectSwitchS1...............................................................................................6JumperJ2....................................................................................................................7ADS1247EVMDefaultJumperLocations................................................................................8VirtualCOMPortInstaller..................................................................................................9VirtualCOMPortSetup....................................................................................................9MMB3SwitchLocations..................................................................................................10

...................................................................................

MMB3BlockDiagram.....................................................................................................ADCProSoftwareStart-upDisplayWindow...........................................................................ADS1247EVM-PDKPlug-InDisplayWindow..........................................................................ConnectionTimeout.......................................................................................................FirmwareDownloadMessageBox......................................................................................FirmwareDownloadProgressIndicator................................................................................FirmwareDownloadCompleteMessageBox.........................................................................ADS1247Multiplexer.....................................................................................................I/OConfigTab.............................................................................................................EnablingVBIASonaChannel...........................................................................................GPIOTab..................................................................................................................GPIOSettoOutputMode................................................................................................GPIOOutputSettoHigh.................................................................................................Power&RefTab..........................................................................................................CalTab.....................................................................................................................AboutTab..................................................................................................................ProgressBarWhileCollectingData....................................................................................

ConnectingADS1247EVMtoMMB3

ListofTables

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J8/J4:AnalogInterfacePinout............................................................................................4J7:SerialInterfacePins....................................................................................................4J3Configuration:Power-SupplyInput....................................................................................5

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REF1ReferenceVoltageOptions........................................................................................ListofSwitches..............................................................................................................ADS1147EVM/ADS1247EVMBillofMaterials.......................................................................

J4Configuration:PowerOptions

66829

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EVMOverview

11.1

EVMOverviewFeatures

ADS1147EVM/ADS1247EVMFeatures:

ContainsallsupportcircuitryneededfortheADS1147/ADS1247 ±2.5Vand+5Vpower-supplyoptionsforADC Voltagereferenceoptions:externaloronboard GPIOaccess

CompatiblewiththeTIModularEVMSystem

ADS1147EVM-PDK/ADS1247EVM-PDKFeatures:

Easy-to-useevaluationsoftwareforMicrosoft®Windows®XP Datacollectiontotextfiles

Built-inanalysistoolsincludingscope,FFT,andhistogramdisplays Completecontrolofboardsettings

Easilyexpandablewithnewanalysisplug-intoolsfromTexasInstruments

Forusewithacomputer,theADS1147EVM-PDKorADS1247EVM-PDKisavailable.ThiskitcombinestheADS1147/ADS1247EVMboardwiththeMSP430-basedMMB3motherboard,andincludesADCPro softwareforevaluation.

TheMMB3motherboardallowstheADS1147/ADS1247EVMtobeconnectedtothecomputerviaanavailableUSBport.ThismanualshowshowtousetheMMB3aspartofthe

ADS1147EVM-PDK/ADS1247EVM-PDK,butdoesnotprovidetechnicaldetailsabouttheMMB3itself.ADCProisaprogramforcollecting,recording,andanalyzingdatafromADCevaluationboards.Itisbasedonanumberofplug-inprograms,soitcanbeexpandedeasilywithnewtestanddatacollectionplug-ins.TheADS1147EVM-PDK/ADS1247EVM-PDKiscontrolledbyaplug-inrunninginADCPro.FormoreinformationaboutADCPro,seetheADCPro Analog-to-DigitalConverterEvalutationSoftwareUser'sGuide(literaturenumberSBAU128),availablefordownloadfromtheTIwebsite.

ThismanualcoverstheoperationofboththeADS1147/ADS1247EVMandthe

ADS1147EVM-PDK/ADS1247EVM-PDK.Throughoutthisdocument,theabbreviationEVMandthetermevaluationmodulearesynonymouswiththeADS1147/ADS1247EVM.Forclarityofreading,therestofthismanualwillreferonlytotheADS1247EVMorADS1247EVM-PDK,butoperationoftheEVMandkitfortheADS1147isidentical,unlessotherwisenoted.

1.2Introduction

TheADS1247EVMisanevaluationmodulebuilttotheTIModularEVMSystemspecification.ItcanbeconnectedtoanymodularEVMsysteminterfacecard.

TheADS1247EVMisavailableasastand-aloneprintedcircuitboard(PCB)oraspartofthe

ADS1247EVM-PDK,whichincludesanMMB3motherboardandsoftware.Asastand-alonePCB,theADS1247EVMisusefulforprototypingdesignsandfirmware

NotethattheADS1247EVMhasnomicroprocessorandcannotrunsoftware.Toconnectittoacomputer,sometypeofinterfaceisrequired.

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2AnalogInterface

Formaximumflexibility,theADS1247EVMisdesignedforeasyinterfacingtomultipleanalogsources.SamtecpartnumbersSSW-110-22-F-D-VS-KandTSM-110-01-T-DV-Pprovideaconvenient10-pin,

dual-row,header/socketcombinationatJ8.Thisheader/socketprovidesaccesstotheanaloginputpinsoftheADS1247.ConsultSamtecatorcall1-800-SAMTEC-9foravarietyofmatingconnectoroptions.ThesesignalscanalsobeconnectedtotheterminalblockJ4.

eappropriatecautionwhenhandlingthesepins.Table1summarizesthepinoutsforanaloginterfacesJ4andJ8.

Table1.J8/J4:AnalogInterfacePinout

PinNumberJ8.1,J4-1J8.2,J4-2J8.3,J4-3J8.4,J4-4J8.5-8J8.18J8.20J8.10-16(even)

J8.15

J8.9-19(odd),J4-9

SignalA0(–)A0(+)A1(–)A1(+)UnusedREF–REF+UnusedUnusedAGND

Analoggroundconnections(exceptJ8.15)

Description,ADS1147/ADS1247

AIN0AIN1AIN2AIN3—

Externalreferencesourceinput(–sideofdifferentialinput)

Externalreferencesourceinput(+sideofdifferentialinput)

33.1

DigitalInterfaceSerialDataInterface

TheADS1247EVMisdesignedtoeasilyinterfacewithmultiplecontrolplatforms.SamtecpartnumbersSSW-110-22-F-D-VS-KandTSM-110-01-T-DV-Pprovideaconvenient10-pin,dual-row,header/socketcombinationatJ7.Thisheader/socketprovidesaccesstothedigitalcontrolandserialdatapinsoftheADC.ConsultSamtecatorcall1-800-SAMTEC-9foravarietyofmatingconnectoroptions.

AlllogiclevelsonJ7are3.3VCMOS,exceptfortheI2C pins.Thesepinsconformto3.3VI2Crules.Table2describestheJ7serialinterfacepins.

Table2.J7:SerialInterfacePins

PinNo.J7.1J7.2J7.3J7.4J7.5J7.6J7.7J7.8J7.9J7.10J7.11J7.12

PinNameCNTLGPIO0CLKXDGNDCLKRGPIO1FSXGPIO2FSRDGNDDXGPIO3

SignalName

STARTSCLKDGNDUnusedUnusedUnusedDGNDDINPWRSEL

I/OType

InInInIn/Out—In——OutIn/OutInIn

PullupHighHighNoneNoneNoneHighNoneNoneNoneNoneNoneHigh

DigitalgroundADS1247SPIdatainSelects±2.5Vor+5VsupplyMasterresetADS1247SPIclockDigitalground

Function

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PowerSupplies

Table2.J7:SerialInterfacePins(continued)

PinNo.J7.13J7.14J7.15J7.16J7.17

PinName

DRGPIO4SCLTOUT

SignalNameDOUT/DRDYUnusedSCLCLK

I/OTypeOut-—OutI2CIn

PullupNoneNoneNoneHighNone

I2Cclock

CanbeusedtoprovideaclockfromaprocessorDigitalgroundI2Cdata

Function

ADS1247dataout

J7.18J7.19J7.20

DGNDGPIO5SDA

DGNDCLKSelectSDA

In/Out—IC

2

NoneNoneHigh

ManypinsonJ7haveweakpull-upresistors.Theseresistorsprovidedefaultsettingsformanyofthecontrolpins.ManypinsonJ7corresponddirectlytoADS1247pins.SeetheADS1247datasheetforcompletedetailsonthesepins.

4PowerSupplies

J3isthepower-supplyinputconnector.Table3liststheconfigurationdetailsforJ3.

Table3.J3Configuration:Power-SupplyInput

PinNo.J3.1J3.2J3.3J3.4J3.5J3.6J3.7J3.8J3.9J3.10

PinName+VA–VA+5VA–5VADGNDAGND+1.8VDVD1+3.3VD+5VD

FunctionUnusedUnused+5Vanalogsupply–5VanalogsupplyDigitalgroundinputAnaloggroundinput1.8Vdigitalsupply

Unused3.3Vdigitalsupply+5Vdigitalsupply

Required

NoNoAlways

Onlyinbipolarmode

YesYesNoNoAlwaysNo

Allofthepowersupplies(AVDD,AVSS,andDVDD)havecorrespondingjumpersonJ10thatcanbereplacedwithacurrentmetertomeasuretherespectivesupplycurrents.

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4.1PowerOptions

J10isarrangedasfiverows,eachofwhichcanbeshorted.Table4liststhepoweroptiondetailsforJ10.Fornormaloperation,J10.1-2,J10.3-4,andJ10.5-6mustbeconnected(directorthroughanammeter),andeither(orboth)ofJ10.7-8andJ10.9-10mustbeconnected;otherwise,theboarddoesnotfunction.

Table4.J4Configuration:PowerOptions

Row1-23-45-67-89-10

NameADCAVDDADCAVSSADCDVDDDGNDAGND

Function

AVDDsupplycurrentmeasurementpointfortheADC.Mustbeconnectedforoperation.

AVSSsupplycurrentmeasurementpointfortheADC.Mustbeconnectedforoperation.

DVDDsupplycurrentmeasurementpointfortheADC.Mustbeconnectedforoperation.ConnectsDGNDtoboardground.ConnectsAGNDtoboardground.

5VoltageReference

TheADS1247devicehastheoptionofselectingbetweentwodifferentreferences:REF0,andtheinternalreference,throughregistersintheADS1247chip.TheEVMprovidesa2.048VreferenceforREF0fromU1,filteredandbufferedthroughU2.This2.048VmaybeusedtodrivetheREF0Pinput,orREF0PcanbeconnectedtotheexternalreferenceinputonJ8throughswitchS1.REF0PshouldnotbeconnectedtoAVDDthroughswitchS1becausethisconnectionwillviolatethespecificationforthemaximumreferenceinput.Figure1showsswitchS1asitappearsontheEVM.Thelowsideofthereference(REF0N)istiedtoAVSS.ThedifferentreferenceoptionsunderdifferentsupplyconditionsareoutlinedinTable5.

Figure1.ReferenceSelectSwitchS1Table5.REF1ReferenceVoltageOptions

(1)

AVDD5V5V5V2.5V2.5V2.5V

(1)

AVSS0V0V0V–2.5V–2.5V–2.5V

J1Setting

1-22-3—1-22-3—

S1Position

BUFFBUFFCenterBUFFBUFFCenter

REF0P2.048V0VREF+(J8.20)–0.452V0VREF+(J8.20)

REF0N0V0V0V–2.5V–2.5V–2.5V

REF0ReferenceVoltage2.048VInvalidselectionUptoAVDD–1

2.048V2.5VUptoAVDD–AVSS–1

SwitchS1shouldnotbesettoAVDD.

TheinternalreferencevoltagecanbemeasuredbetweentestpointsTP3(IntREF)andTP5(REFCOM).

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ClockSource

6ClockSource

TheADS1247hasaninternalclockorcanbeprovidedanexternalclock.TheEVMusestheinternalclockmodeonly.ProvisionismadeontheEVMcircuitboard,however,foranexternalclocksource.AfootprintisprovidedatU8foracrystaloscillatortobemountedontheboard.Anexternalclockmayalsobe

providedbyaprocessorontheTOUTpin(J7.17),oranexternalclocksourceconnectedtoJ9.1(ground)andJ9.2(signal).

J2controlshowtheclocksourceisselected.WithpinsJ2.1andJ2.2shorted,GPIO5fromJ7.19cancontrolwhethertheAorBsideofU7isselected.IftheAsideisselected,theclockshouldcomefromanexternalsourceprovidedasdescribedabove.IftheBsideisselected,theclockshouldcomefromthecrystaloscillator.Ifaselectionismadeandnoclockisprovidedonthatinput,theADS1247detectsthatnoexternalclockispresentandenablesitsinternaloscillator.

6.1UsageinPDK

IfusingtheADS1247EVMaspartoftheADS1247EVM-PDK,removeanyshortingblocksonjumperJ6,andmakesureJ2hasajumperbetweenpins1and2(theIOposition).ThisconfigurationgroundstheCLKinputtotheADS1247andensuresthattheinternaloscillatorstartsup.

6.2UsageasaStand-AloneEVM

IfusingtheEVMinyourownsystemandnotwiththePDKhardwareandsoftware,observethefollowingrecommendations:

J6shouldberemovediftheexternalclocksourceisusedandtheTOUTpinisstilldrivenbyaprocessorinordertoavoidconflicts.

JumperJ2canbeusedtoalwaysselecttheU8oscillator(DVDDposition)orallowtheonboard/externalclockselectiontobecontrolledbyGPIO5(J7.19)asshowninFigure2.

Figure2.JumperJ2

7EVMOperation

Thissectionprovidesinformationontheanaloginput,digitalcontrol,andgeneraloperatingconditionsoftheADS1247EVM.

7.1AnalogInput

EachoftheanaloginputsourcescanbeapplieddirectlytoJ8(toporbottomside)orthrough

signal-conditioningmodulesavailableforthethemodularEVMsystem.TerminalblockJ4isconnectedinparallelwiththeanalogsignalconnectionstoJ8.Eachinputhasa47 /47pFRCfilterinserieswithit,andadifferential0.1μFcapacitorisacrosseachinputpairforusewithdifferentialsignals.

7.2DigitalControl

ThedigitalcontrolsignalscanbeapplieddirectlytoJ7(toporbottomside).ThemodularADS1247EVMcanalsobeconnecteddirectlytoaDSPormicrocontrollerinterfaceboard,suchasthe5-6KInterfaceorHPA-MCUInterfaceboardsavailablefromTexasInstruments,ortheMMB3ifpurchasedaspartoftheADS1247EVM-PDK.Foralistofcompatibleinterfaceand/oraccessoryboardsfortheEVMortheADS1247,seetherelevantproductfolderontheTIwebsite.

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7.3DefaultJumperSettingsandSwitchPositions

Figure3showsthejumpersfoundontheEVMandtherespectivefactorydefaultconditionsforeach.

Figure3.ADS1247EVMDefaultJumperLocations

Table6liststheswitchesfoundontheEVMandtherespectivefactorydefaultconditionsforeach.

Table6.ListofSwitches

SwitchS1

DefaultPosition

Left

SwitchDescriptionOnboardreference

8ADS1247EVM-PDKKitOperation

ThissectionprovidesinformationonusingtheADS1247EVM-PDK,includingsetup,programinstallation,andprogramusage.

TopreparetoevaluatetheADS1247withtheADS1247EVM-PDK,completethefollowingsteps:Step1.InstalltheADCProsoftware(ifnotalreadyinstalled)pletetheUSBdriverinstallationprocess.Step4.SetuptheADS1247EVM-PDK.

Step5.ConnecttheADS1247EVM-PDKtothecomputerwithaUSBcable.Step6.RuntheADCProsoftware.Eachtaskisdescribedinthesubsequentsectionsofthisdocument.

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ADS1247EVM-PDKKitOperation

8.1InstallingtheADCProSoftware

CAUTION

DonotconnecttheADS1247EVM-PDKbeforeinstallingthesoftwareonasuitablePC.FailuretoobservethiscautionmaycauseMicrosoftWindowstonotrecognizetheADS1247EVM-PDKasaconnecteddevice.

TheCD-ROMshippedwiththeADS1247EVMcontainsaninstallerforADCProaswellasaninstallerfortheADS1247EVMplug-in.ThelatestsoftwareisavailablefromtheTIwebsiteat/.RefertotheADCProUserGuideforinstructionsoninstallingandusingADCPro.

ToinstalltheADS1247EVM-PDKplug-in,runthefile:ads1247evm-pdk-plug-in-1.0.0.exe(1.0.0istheversionnumber,andincrementswithsoftwareversionreleases;youmayhaveadifferentversiononyourCD).Double-clickthefiletorunit;thenfollowtheinstructionsshown.YoucanalsousetheADCProUpdateCheckfeaturetocheckfornewerversionsoftheADS1247EVM-PDKplug-in,onceyouhaveinstalledaversionofit.

Followtheon-screenprompts.OncetheADCProplug-ininstalls,youwillbepromptedtoinstalltheVirtualCOMportdriverasshowninFigure4.

Figure4.VirtualCOMPortInstaller

PressOKandthescreenshowninFigure5isdisplayed.

Figure5.VirtualCOMPortSetup

IfyoualreadyhaveaTUSB3410VirtualCOMportdriverinstalledonyoursystem,selectCancel;otherwise,pressSetupandfollowtheon-screenprompts.Youmaybenotifiedthatthedriverisnotdigitallysigned.Ifthismessageappears,selectContinueAnywayandproceed.

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8.2SettingUptheADS1247EVM-PDK

TheADS1247EVM-PDKcontainsboththeADS1247EVMandtheMMB3motherboard;however,thedevicesareshippedunconnected.FollowthesestepstosetuptheADS1247EVM-PDK.Step1.UnpacktheADS1247EVM-PDKkit.

Step2.SettheswitchesontheMMB3asdescribedbelow,asshowninFigure6.

SetswitchSW4totheright.

SettheDACswitch(SW5)totheOUTposition(totheright).

Figure6.MMB3SwitchLocations

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