ADS124x 24-Bit, 2-kSPS, Analog-To-Digital Converters With ...

1 AIN0/IEXCAIN1/IEXCB urnoutDetectBurnoutDetect3rd Order ModulatorAVDDREFP1 REFN1 DVDDADS1247 ADS1248 SCLKDINDRDYDOUT/DRDYCSSTARTRESETDGNDCLKA VSSI nputMuxVBIASPGAA djustableDigitalFilterSerialInterfaceAnd ControlInternal OscillatorAIN2/IEXC/GPIO2 AIN3/IEXC/GPIO3 AIN4/IEXC/GPIO4 AIN5/IEXC/GPIO5 AIN6/IEXC/GPIO6 AIN7/IEXC/GPIO7 REFP0/GPIO0 REFN0/GPIO1 VREF MuxVoltageReferenceGPIOS ystemMonitorVREFOUT VREFCOMIEXC1 IEXC2 ADS1248 OnlyADS1248 OnlyDualIDACsADS1248 OnlyAINPAINNB urnoutDetectBurnoutDetect3rd Order ModulatorAVDDREFPREFNDVDDADS1246 SCLKDINDRDYDOUT/DRDYCSSTARTRESETDGNDCLKA VSSI nputMuxVBIASPGAA djustableDigitalFilterSerialInterfaceAnd ControlInternal OscillatorProductFolderSample &BuyTechnicalDocumentsTools &SoftwareSupport &CommunityReferenceDesignAn IMPORTANTNOTICEat the end of this datasheetaddressesavailability,warranty, changes,use in safety-criticalapplications,intellectual propertymattersand ,ADS1247,ADS1248 SBAS426H AUGUST2008 REVISEDMARCH2016 ADS124x24-Bit, 2-kSPS, analog -To-DigitalCo nvertersWithProgrammableGain Amplifier(PGA)For SensorMeasurement11 Features1 ProgrammableDataRatesUp to 2 ksps Single-CycleSettlingfor All DataRates Simultaneous50-Hzand 60-HzRejectionat 20 SPS AnalogMultiplexerWith8 (ADS1248)and 4(ADS1247)IndependentlySelectableInputs Low-NoisePGA:48 nVRMSat PGA= 128 Dual-MatchedProgrammableExcitationCurren tSources.

2 10 ppm/ C (Maximum) SensorBurn-OutDetection 4 or 8 General-PurposeI/Os (ADS1247,ADS1248) InternalTemperatureSensor PowerSupplyand VREFM onitoring(ADS1247,ADS1248) Self and SystemCalibration SPI -CompatibleSerialInterface AnalogSupply:Unipolar( V to ) andBipolar( V) Operation V to Applications TemperatureSensorMeasurements: RTDs,Thermocouples,and Thermistors PressureMeasurements FlowMeters FactoryAutomationand ProcessControls3 DescriptionThe ADS1246,ADS1247,and ADS1248devicesareprecision,24-bitanalog- to-digitalconverters(ADCs)thatincludeman yintegratedfeaturesto reducesystemcostandcomponentcountfor ,programmablegainamplifier(PGA),aprecisi ondelta-sigma( ) ADCwitha single-cyclesettlingdigitalfilter,andan ADS1248devicesalso providea built-in, low-driftvoltagereference,andtwomatchedp rogrammableexcitationcurrentsources(IDAC s).

3 An inputmultiplexersupportsfour differentialinputsfor the ADS1248,two for the ADS1247,and one forthe addition,the multiplexerintegratessensorburn-outdetec tion,voltagebiasforthermocouples,systemm onitoring,andgeneralpurposedigitalI/Os(A DS1247and ADS1248).ThePGAprovidesselectablegainsup to 128 completefront-endsolutionfortemperatures ensormeasurementapplicationsincludingthe rmocouples,thermistors,and resistancetemperaturedetectors(RTDs)and digitalfiltersettlesin a singlecycleto supportfast channelcyclingwhenusingthe inputmultiplexerand providesdataratesup to 2 dataratesof 20 SPSor less,both50-Hzand 60-Hzinterferenceare rejectedby the (1)PARTNUMBERPACKAGEBODYSIZE(NOM)ADS1246 TSSOP(16) (20) (28) (1) For all availablepackages,see the orderableaddendumatthe end of the ,ADS1247,ADS1248 SBAS426H AUGUST2008.

4 ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporatedTableof Contents1 Pin Configurationand Applicationand 's and Don' Deviceand Mechanical,Packaging,and RevisionHistoryNOTE:Pagenumbersfor previousrevisionsmay differfrompagenumbersin the (October2011)to RevisionHPage AddedESDR atingstable,FeatureDescriptionsection,De viceFunctionalModes,Applicationand Implementationsection,PowerSupplyRecomme ndationssection,Layoutsection,Deviceand DocumentationSupportsection,andMechanica l,Packaging,and UpdatedFeaturesandDescriptionsectionsto includeuse in EditedDeviceComparisonTableto includeADS1146,ADS1147,and ADS1148;changedtitle, MergedallPin Functionsinto one table,changedIOUT1and IOUT2to IEXC1and IEXC2to Changedcompliancevoltagefor excitationcurrentsourcesinElectricalChar acteristics, now refersto Figure41 andFigure42; changedinitialerrorand initialmismatchto absoluteerrorand Re-orderedelementsinTimingRequirementsta bles,changedtimingreferencesto ChangedorderofTypicalCharacteristicscurv esto Addedcross-referencefor Equation1 Correctedvaluesin ModifiedLow-NoisePGAsectionto add moredetail;addedTable7; AddedfCLK/fMODcolumnto Table9.

5 30 Addedcross-referencefor Equation15 Addedcross-referencefor Equation16 Correctedvaluesin Table15 to removeextra0 in Addedtext toChipSelectsectionto say that SCLK will forceDRDY high,evenwith CS Addedtext toDataOutputand DataReadysectionto say that stop readdatacontinuousmodeis not compatiblewith DRDYMODEset to 1 ..42 ModifiedFigure74 and Figure75 to bettershowDIN transitionswith respectto SCLK;replacedFigure76 to better3 ADS1246,ADS1247, AUGUST2008 REVISEDMARCH2016 ProductFolderLinks:ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporatedRevisio nHistory(continued)showfull commandand DRDY/DOUT fallingwith AddedmoreinfomationtoDataFormatsection;a ddedFigure77 ..44 Addedcross-referencefor Figure78 ModifiedFigure78 to includeCS statusthroughSLEEPand UpdatedFigure79 and Figure80 to showstartof Addedcross-referencefor Figure83 RemovedfigureforSDATAC(StopReadDataConti nuous) UpdatedFigure85 to showMUX1as the startof the databyte for the givencommandand UpdatedFigure86 to showstartof UpdatedRegisterMapssectionto new typicalapplicationsforRatiometric3-WireR TDM easurementSystemandK-TypeThermocoupleMea surement( 200 C to +1250 C) with UpdatedFigure112 and Figure113 to (June2011)to RevisionGPage AddedFigure35.

6 17 AddedFigure41 and (December,2010)to RevisionFPage Addedtest AddedtCSPWto minimumspecificationin TimingCharacteristicsfor UpdatedFigure1 to Correctedgrid and axis valuesfor Figure29 ..16 Correctedgrid and axis valuesfor Figure30 ..16 AddedEquation18 AddedRestrictedcommandspaceto Table19 ..454 ADS1246,ADS1247,ADS1248 SBAS426H AUGUST2008 :ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporated5 DeviceComparisonTablePRODUCTRESOLUTION(B its)NUMBEROFINPUTSVOLTAGEREFERENCEEXCITA TIONCURRENTSOURCESPACKAGEADS1146161 DifferentialExternalNoTSSOP-16 ADS1147164-InputMultiplexerInternalor ExternalYesTSSOP-20 ADS1148168-InputMultiplexerInternalor ExternalYesTSSOP-28 VQFN-32 ADS1246241 DifferentialExternalNoTSSOP-16 ADS1247244-InputMultiplexerInternalor ExternalYesTSSOP-20 ADS1248248-InputMultiplexerInternalor ExternalYesTSSOP-28 DVDDDGNDCLKRESETREFPREFNAINPAINNSCLKDIND OUT/DRDYDRDYCSSTARTAVDDAVSS1234567816151 4131211109 ADS1246 DVDDDGNDCLKRESETREFP0/GPIO0 REFN0/GPIO1 REFP1 REFN1 VREFOUTVREFCOMAIN0/IEXCAIN1/IEXCAIN4/IEX C/GPIO4 AIN5/IEXC/GPIO5 SCLKDINDOUT/DRDYDRDYCSSTARTAVDDAVSSIEXC1 IEXC2 AIN3/IEXC/GPIO3 AIN2/IEXC/GPIO2 AIN7/IEXC/GPIO7 AIN6/IEXC/GPIO61234567891011121314282726 2524232221201918171615 ADS1248

7 DVDDDGNDCLKRESETREFP0/GPIO0 REFN0/GPIO1 VREFOUTVREFCOMAIN0/IEXCAIN1/IEXCSCLKDIND OUT/DRDYDRDYCSSTARTAVDDAVSSAIN3/IEXC/GPI O3 AIN2/IEXC/GPIO21234567891020191817161514 131211 ADS12475 ADS1246,ADS1247, AUGUST2008 REVISEDMARCH2016 ProductFolderLinks:ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporated6 Pin Configurationand FunctionsPW Package28-PinTSSOPTop ViewPW Package20-PinTSSOPTop ViewPW Package16-PinTSSOPTop View6 ADS1246,ADS1247,ADS1248 SBAS426H AUGUST2008 :ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporated(1)G = Ground,I = Input,O = Output,P = Power(2)SeeUnusedInputsand Outputsfor unusedpin FunctionsPINTYPE(1)DESCRIPTION(2)NAMEADS 1248(TSSOP-28)ADS1247(TSSOP-20)ADS1246(T SSOP-16)

8 AIN0/IEXC119 IAnaloginput0, optionalexcitationcurrentoutputAIN1/IEXC 1210 IAnaloginput1, optionalexcitationcurrentoutputAIN2/IEXC /GPIO21711 I/OAnaloginput2, optionalexcitationcurrentoutput,or general-purposedigitalinput/outputpin 2 AIN3/IEXC/GPIO31812 I/OAnaloginput3, optionalexcitationcurrentoutput,or general-purposedigitalinput/outputpin 3 AIN4/IEXC/GPIO413 I/OAnaloginput4, optionalexcitationcurrentoutput,or general-purposedigitalinput/outputpin 4 AIN5/IEXC/GPIO514 I/OAnaloginput5, optionalexcitationcurrentoutput,or general-purposedigitalinput/outputpin 5 AIN6/IEXC/GPIO615 I/OAnaloginput6, optionalexcitationcurrentoutput,or general-purposedigitalinput/outputpin 6 AIN7/IEXC/GPIO716 I/OAnaloginput7, optionalexcitationcurrentoutput,or general-purposedigitalinput/outputpin 7 AINN 8 INegativeanaloginputAINP 7 IPositiveanaloginputAVDD221410 PPositiveanalogpowersupply,connecta F capacitortoAVSSAVSS21139 PNegativeanalogpowersupplyCLK333 IExternalclockinput,tie to DGNDto activatethe internaloscillatorCS241612 IChipselect(activelow)DGND222 GDigitalgroundDIN271915 ISerialdatainputDOUT/DRDY261814 OSerialdataoutputor dataoutputcombinedwith datareadyDRDY251713 ODataready(activelow)

9 DVDD111 PDigitalpowersupply,connecta F capacitorto DGNDIEXC120 OExcitationcurrentoutput1 IEXC219 OExcitationcurrentoutput2 REFN 6 INegativeexternalreferenceinputREFN0/GPI O166 I/ONegativeexternalreferenceinput0, orgeneral-purposedigitalinput/outputpin 1 REFN18 INegativeexternalreferenceinput1 REFP 5 IPositiveexternalreferenceinputREFP0/GPI O055 I/OPositiveexternalreferenceinput0, orgeneral-purposedigitalinput/outputpin 0 REFP17 IPositiveexternalreferenceinput1 RESET444 IReset(activelow)SCLK282016 ISerialclockinputSTART231511 IConversionstartVREFCOM108 ONegativeinternalreferencevoltageoutput, connectto AVSS whenusinga unipolarsupplyor to the mid-voltageof thepowersupplywhenusinga bipolarsupplyVREFOUT97 OPositiveinternalreferencevoltageoutput, connecta capacitorin the rangeof 1- F to 47- F to VREFCOM7 ADS1246,ADS1247, AUGUST2008 REVISEDMARCH2016 ProductFolderLinks:ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporated(1)Stre ssesbeyondthoselistedunderAbsoluteMaximu mRatingsmay causepermanentdamageto the stressratingsonly,whichdo not implyfunctionaloperationof the deviceat theseor any otherconditionsbeyondthoseindicatedunder RecommendedOperatingConditions.

10 Exposureto absolute-maximum-ratedconditionsfor extendedperiodsmay (1)MINMAXUNITP ower-supplyvoltageAVDDto AVSS DGND DGND ,REFPx,REFNx,VREFOUT,VREFCOM,IEXC1,IEXC2 AVSS + ,DIN,DOUT/DRDY,DRDY,CS, START,RESET,CLKDGND + ,any pin exceptpowersupplypins 1010mAMomentary,any pin exceptpowersupplypins 100100 TemperatureJunction,TJ150 CStorage,Tstg 60150(1)JEDEC documentJEP155statesthat 500-VHBM allowssafe manufacturingwith a standardESDcontrolprocess.(2)JEDEC documentJEP157statesthat 250-VCDM allowssafe manufacturingwith a (ESD)ElectrostaticdischargeHumanbodymode l(HBM),per ANSI/ESDA/JEDECJS-001,all pins(1) 2000 VChargeddevicemodel(CDM),per JEDEC specificationJESD22-C101,all pins(2) 5008 ADS1246,ADS1247,ADS1248 SBAS426H AUGUST2008 :ADS1246 ADS1247 ADS1248 SubmitDocumentationFeedbackCopyright 2008 2016,TexasInstrumentsIncorporated(1)AINP and AINN denotethe positiveand negativeinputsof the PGA.