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LM94021www.
ti.
comSNIS138E–FEBRUARY2005–REVISEDJUNE2013LM94021/LM94021QMulti-GainAnalogTemperatureSensorCheckforSamples:LM940211FEATURESDESCRIPTIONTheLM94021isaprecisionanalogoutputCMOS2LM94021QisAEC-Q100Grade0Qualifiedandintegrated-circuittemperaturesensorthatoperatesatisManufacturedonanAutomotiveGradeFlowasupplyvoltageaslowas1.
5V.
WhileoperatingoverLow1.
5VOperationthewidetemperaturerangeof50°Cto+150°C,theFourSelectableGainsLM94021deliversanoutputvoltagethatisinverselyproportionaltomeasuredtemperature.
TheVeryAccurateOverWideTemperatureRangeLM94021'slowsupplycurrentmakesitidealforof50°Cto+150°Cbattery-poweredsystemsaswellasgeneralLowQuiescentCurrenttemperaturesensingapplications.
OutputisShort-CircuitProtectedTwologicinputs,GainSelect1(GS1)andGainExtremelySmallSC70PackageSelect0(GS0),selectthegainofthetemperature-to-voltageoutputtransferfunction.
FourslopesareFootprintCompatiblewiththeIndustry-selectable:5.
5mV/°C,8.
2mV/°C,10.
9mV/°C,StandardLM20TemperatureSensorand13.
6mV/°C.
InthelowestgainconfigurationULRecognizedComponent(GS1andGS0bothtiedlow),theLM94021canoperatewitha1.
5VsupplywhilemeasuringAPPLICATIONStemperatureoverthefull50°Cto+150°Coperatingrange.
TyingbothinputshighcausesthetransferCellPhonesfunctiontohavethelargestgainof13.
6mV/°CforWirelessTransceiversmaximumtemperaturesensitivity.
Thegain-selectBatteryManagementinputscanbetieddirectlytoVDDorGroundwithoutanypull-uporpull-downresistors,reducingAutomotivecomponentcountandboardarea.
TheseinputscanDiskDrivesalsobedrivenbylogicsignalsallowingthesystemtoGamesoptimizethegainduringoperationorsystemAppliancesdiagnostics.
Table1.
KEYSPECIFICATIONSSupplyVoltage1.
5Vto5.
5VSupplyCurrent9μA(typ)20°Cto40°C±1.
5°C50°Cto70°C±1.
8°CTemperatureAccuracy50°Cto90°C±2.
1°C50°Cto150°C±2.
7°COperatingTemperature–50°Cto150°C1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2Alltrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2005–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
ti.
comThesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
CONNECTIONDIAGRAMFigure1.
5-PinSC70-TopViewTYPICALTRANSFERCHARACTERISTICOutputVoltagevsTemperatureTYPICALAPPLICATIONFull-RangeCelsiusTemperatureSensor(50°Cto+150°C)operatingfromaSingleBatteryCell2SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
ti.
comSNIS138E–FEBRUARY2005–REVISEDJUNE2013PINDESCRIPTIONSLABELPINNUMBERTYPEEQUIVALENTCIRCUITFUNCTIONGainSelect1-OneoftwoinputsforGS15LogicInputselectingtheslopeoftheoutputresponseGainSelect0-OneoftwoinputsforGS01LogicInputselectingtheslopeoftheoutputresponseOutputsavoltagewhichisinverselyOUT3AnalogOutputproportionaltotemperatureVDD4PowerPositiveSupplyVoltageGND2GroundPowerSupplyGroundABSOLUTEMAXIMUMRATINGS(1)VALUESSupplyVoltage0.
3Vto+6.
0VVoltageatOutputPin0.
3Vto(VDD+0.
5V)OutputCurrent±7mAVoltageatGS0andGS1InputPins0.
3Vto+6.
0VInputCurrentatanypin(2)5mAStorageTemperature65°Cto+150°CMaximumJunctionTemperature(TJMAX)+150°CHumanBodyModel2500VESDSusceptibility(3)MachineModel250VSolderingprocessmustcomplywithReflowTemperatureProfilespecifications.
Refertohttp://www.
ti.
com/packaging.
(4)(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotensurespecificperformancelimits.
Forensuredspecificationsandtestconditions,seetheElectricalCharacteristics.
Theensuredspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaydegradewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Whentheinputvoltage(VI)atanypinexceedspowersupplies(VIV+),thecurrentatthatpinshouldbelimitedto5mA.
(3)Thehumanbodymodelisa100pFcapacitordischargedthrougha1.
5kΩresistorintoeachpin.
Themachinemodelisa200pFcapacitordischargeddirectlyintoeachpin.
(4)Reflowtemperatureprofilesaredifferentforlead-freeandnon-lead-freepackages.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
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comOPERATINGRATINGS(1)SpecifiedTemperatureRangeTMIN≤TA≤TMAXLM9402150°C≤TA≤+150°CSupplyVoltageRange(VDD)+1.
5Vto+5.
5VThermalResistance(θJA)(2)(3)415°C/W5-PinSC70(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotensurespecificperformancelimits.
Forensuredspecificationsandtestconditions,seetheElectricalCharacteristics.
Theensuredspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaydegradewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Thejunctiontoambientthermalresistance(θJA)isspecifiedwithoutaheatsinkinstillair.
(3)Changesinoutputduetoselfheatingcanbecomputedbymultiplyingtheinternaldissipationbythethermalresistance.
ACCURACYCHARACTERISTICSTheselimitsdonotincludeDCloadregulation.
ThesestatedaccuracylimitsarewithreferencetothevaluesintheLM94021TransferTable.
UNITSPARAMETERCONDITIONSLIMITS(1)(LIMIT)TA=+20°Cto+40°C;VDD=1.
5Vto5.
5V±1.
5°C(max)TA=+0°Cto+70°C;VDD=1.
5Vto5.
5V±1.
8°C(max)TA=+0°Cto+90°C;VDD=1.
5Vto5.
5V±2.
1°C(max)GS1=0GS0=0TA=+0°Cto+120°C;VDD=1.
5Vto5.
5V±2.
4°C(max)TA=+0°Cto+150°C;VDD=1.
5Vto5.
5V±2.
7°C(max)TA=50°Cto+0°C;VDD=1.
6Vto5.
5V±1.
8°C(max)TA=+20°Cto+40°C;VDD=1.
8Vto5.
5V±1.
5°C(max)TA=+0°Cto+70°C;VDD=1.
9Vto5.
5V±1.
8°C(max)TA=+0°Cto+90°C;VDD=1.
9Vto5.
5V±2.
1°C(max)GS1=0GS0=1TA=+0°Cto+120°C;VDD=1.
9Vto5.
5V±2.
4°C(max)TA=+0°Cto+150°C;VDD=1.
9Vto5.
5V±2.
7°C(max)TA=50°Cto+0°C;VDD=2.
3Vto5.
5V±1.
8°C(max)TemperatureError(2)TA=+20°Cto+40°C;VDD=2.
2Vto5.
5V±1.
5°C(max)TA=+0°Cto+70°C;VDD=2.
4Vto5.
5V±1.
8°C(max)TA=+0°Cto+90°C;VDD=2.
4Vto5.
5V±2.
1°C(max)GS1=1GS0=0TA=+0°Cto+120°C;VDD=2.
4Vto5.
5V±2.
4°C(max)TA=+0°Cto+150°C;VDD=2.
4Vto5.
5V±2.
7°C(max)TA=50°Cto+0°C;VDD=3.
0Vto5.
5V±1.
8°C(max)TA=+20°Cto+40°C;VDD=2.
7Vto5.
5V±1.
5°C(max)TA=+0°Cto+70°C;VDD=3.
0Vto5.
5V±1.
8°C(max)TA=+0°Cto+90°C;VDD=3.
0Vto5.
5V±2.
1°C(max)GS1=1GS0=1TA=+0°Cto+120°C;VDD=3.
0Vto5.
5V±2.
4°C(max)TA=0°Cto+150°C;VDD=3.
0Vto5.
5V±2.
7°C(max)TA=50°Cto+0°C;VDD=3.
6Vto5.
5V±1.
8°C(max)(1)LimitsareensuredtoTI'sAOQL(AverageOutgoingQualityLevel).
(2)Accuracyisdefinedastheerrorbetweenthemeasuredandreferenceoutputvoltages,tabulatedintheTransferTableatthespecifiedconditionsofsupplygainsetting,voltage,andtemperature(expressedin°C).
Accuracylimitsincludelineregulationwithinthespecifiedconditions.
Accuracylimitsdonotincludeloadregulation;theyassumenoDCload.
4SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
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comSNIS138E–FEBRUARY2005–REVISEDJUNE2013ELECTRICALCHARACTERISTICSUnlessotherwisenoted,thesespecificationsapplyfor+VDD=+1.
5Vto+5.
5V.
BoldfacelimitsapplyforTA=TJ=TMINtoTMAX;allotherlimitsTA=TJ=25°C.
UNITSPARAMETERCONDITIONSTYPICAL(1)LIMITS(2)(LIMIT)GS1=0,GS0=05.
5mV/°CGS1=0,GS1=18.
2mV/°CSensorGainGS1=1,GS0=010.
9mV/°CGS1=1,GS0=113.
6mV/°CSource≤2.
0μA(4)1mV(max)LoadRegulation(3)Sink≤100μA1.
6mV(max)Sink=50μA0.
4mVLineRegulation(5)(VDD-VOUT)≥200mV200μV/VTA=+30°Cto+150°C912μA(max)ISSupplyCurrentTA=50°Cto+150°C13μA(max)CLOutputLoadCapacitance1100pF(max)CL=0pF0.
71.
6ms(max)Power-onTime(6)CL=1100pF0.
82.
4ms(max)GS1andGS0InputLogic"1"ThresholdVIHVDD-0.
5VV(min)VoltageGS1andGS0InputLogic"0"ThresholdVIL0.
5V(max)VoltageIIHLogic"1"InputCurrent(7)0.
0011μA(max)IILLogic"0"InputCurrent(7)0.
0011μA(max)(1)TypicalsareatTJ=TA=25°Candrepresentmostlikelyparametricnorm.
(2)LimitsareensuredtoTI'sAOQL(AverageOutgoingQualityLevel).
(3)SourcecurrentsareflowingoutoftheLM94021.
SinkcurrentsareflowingintotheLM94021.
(4)Assumes(VDD-VOUT)≥200mV.
(5)Lineregulationiscalculatedbysubtractingtheoutputvoltageatthehighestsupplyvoltagefromtheoutputvoltageatthelowestsupplyvoltage.
ThetypicallineregulationspecificationdoesnotincludetheoutputvoltageshiftdiscussedinSection5.
0.
(6)Specifiedbydesign.
(7)Theinputcurrentisleakageonlyandishighestathightemperature.
Itistypicallyonly0.
001A.
The1Alimitissolelybasedonatestinglimitationanddoesnotreflecttheactualperformanceofthepart.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
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comTYPICALPERFORMANCECHARACTERISTICSTemperatureErrorvs.
TemperatureMinimumOperatingTemperaturevs.
SupplyVoltageFigure2.
Figure3.
SupplyCurrentvs.
TemperatureSupplyCurrentvs.
SupplyVoltageFigure4.
Figure5.
LoadRegulation,SourcingCurrentLoadRegulation,SinkingCurrentFigure6.
Figure7.
6SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
ti.
comSNIS138E–FEBRUARY2005–REVISEDJUNE2013TYPICALPERFORMANCECHARACTERISTICS(continued)ChangeinVOUTvs.
OverheadVoltageSupplyNoiseGainvs.
FrequencyFigure8.
Figure9.
LineRegulation:OutputVoltagevs.
SupplyVoltageLineRegulation:OutputVoltagevs.
SupplyVoltageGainSelect=00GainSelect=01Figure10.
Figure11.
LineRegulation:OutputVoltagevs.
SupplyVoltageLineRegulation:OutputVoltagevs.
SupplyVoltageGainSelect=10GainSelect=11Figure12.
Figure13.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
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comAPPLICATIONINFORMATIONLM94021TRANSFERFUNCTIONTheLM94021hasfourselectablegains,eachofwhichcanbeselectedbytheGS1andGS0inputpins.
Theoutputvoltageforeachgain,acrossthecompleteoperatingtemperaturerangeisshowninTable2,below.
ThistableisthereferencefromwhichtheLM94021accuracyspecifications(listedintheELECTRICALCHARACTERISTICSsection)aredetermined.
Thistablecanbeused,forexample,inahostprocessorlook-uptable.
Afilecontainingthisdataisavailablefordownloadathttp://www.
ti.
com/lsds/ti/analog/temperature_sensor.
page.
Table2.
LM94021TransferTableTEMPERATUREGS=00GS=01GS=10GS=11(°C)(mV)(mV)(mV)(mV)501299195526163277491294194926073266481289194225983254471284193525893243461278192825803232451273192125713221441268191525623210431263190825533199421257190025433186411252189225333173401247188525223160391242187725123147381236186925013134371231186124913121361226185324813108-3512211845247030953412151838246030823312101830244930693212051822243930563112001814242930433011941806241830302911891798240830172811841790239730042711781783238729912611731775237629782511681767236629652411621759235529522311571751234529382211521743233429252111461735232429122011411727231328991911361719230228861811301711229228731711251703228128591611201695227128461511141687226028331411091679225028201311041671223928078SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
ti.
comSNIS138E–FEBRUARY2005–REVISEDJUNE2013Table2.
LM94021TransferTable(continued)TEMPERATUREGS=00GS=01GS=10GS=11(°C)(mV)(mV)(mV)(mV)1210981663222827931110931656221827801010881648220727679108216392197275481077163121862740710721623217527276106616152164271451061160721542700410551599214326873105015912132267421044158321222660110391575211126470103415672100263311028155920892620210231551207926073101715432068259341012153520572580510071527204725676100115192036255379961511202525408990150220142527998514942004251310980148619932500119741478198224861296914701971247313963146219612459149581454195024461595214461939243316947143819282419179411430191824061893614211907239219931141318962379209251405188523652192013971874235222914138918642338239091381185323252490313731842231125898136518312298268921356182022852788713481810227128882134017992258298761332178822443087113241777223131865131617662217328601308175622043385412991745219034849129117342176Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
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comTable2.
LM94021TransferTable(continued)TEMPERATUREGS=00GS=01GS=10GS=11(°C)(mV)(mV)(mV)(mV)358431283172321633683812751712214937832126717012136388271258169021223982112501679210840816124216682095418101234165720814280412251646206743799121716352054447931209162420404578812011613202646782119216022012477771184159119994877111761580198549766116715691971507601159155819585175411511547194452749114315361930537431134152519165473811261514190255732111815031888567261109149218755772111011481186158715109314701847597101084145918336070410761448181961698106714361805626931059142517916368710511414177764681104214031763656761034139117496667010251380173567664101713691721686591008135817076965310001346169370647991133516797164298313241665726369741313165173630966130116377462595712901623756199491279160976613941126815957760893212571581786029241245156779596915123415538059190712231539815858981212152510SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
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comSNIS138E–FEBRUARY2005–REVISEDJUNE2013Table2.
LM94021TransferTable(continued)TEMPERATUREGS=00GS=01GS=10GS=11(°C)(mV)(mV)(mV)(mV)8257989012011511835748811189149784568873117814838556286511671469865578561155145587551848114414418854583911331427895398311122141390534822111013999152881410991385925228051088137193517797107613569451178810651342955057791054132896499771104213149749476210311300984887541020128699482745100812721004767379971257101471728986124310246572097412291034597119631215104453702951120110544869494011861064426859291172107436677917115810843066890611441094256608951130110419651883111511141364287211011124076348601087113401625849107311439661783710581153906088261044116384599814103011737859180310151183725827911001119367573780987120361565769973121355556757958122349547745944123343539734929124337530722915125332521711901126326513699886127320504688872128314495676858Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
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comTable2.
LM94021TransferTable(continued)TEMPERATUREGS=00GS=01GS=10GS=11(°C)(mV)(mV)(mV)(mV)129308487665843130302478653829131296469642814132291460630800133285452618786134279443607771135273434595757136267425584742137261416572728138255408560713139249399549699140243390537684141237381525670142231372514655143225363502640144219354490626145213346479611146207337467597147201328455582148195319443568149189310432553150183301420538AlthoughtheLM94021isverylinear,itsresponsedoeshaveaslightumbrella'sparabolicshape.
ThisshapeisveryaccuratelyreflectedintheLM94021TransferTable.
TheTransferTablecanbecalculatedbyusingtheparabolicequation.
(1)Foralinearapproximation,alinecaneasilybecalculatedoverthedesiredtemperaturerangefromtheTableusingthetwo-pointequation:(2)WhereVisinmV,Tisin°C,T1andV1arethecoordinatesofthelowesttemperature,T2andV2arethecoordinatesofthehighesttemperature.
Forexample,ifwewanttodeterminetheequationofalinewiththeGainSettingatGS1=0andGS0=0,overatemperaturerangeof20°Cto50°C,wewouldproceedasfollows:(3)(4)(5)12SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
ti.
comSNIS138E–FEBRUARY2005–REVISEDJUNE2013Usingthismethodoflinearapproximation,thetransferfunctioncanbeapproximatedforoneormoretemperaturerangesofinterest.
MOUNTINGANDTHERMALCONDUCTIVITYTheLM94021canbeappliedeasilyinthesamewayasotherintegrated-circuittemperaturesensors.
Itcanbegluedorcementedtoasurface.
Toensuregoodthermalconductivity,thebacksideoftheLM94021dieisdirectlyattachedtotheGNDpin(Pin2).
ThetemperaturesofthelandsandtracestotheotherleadsoftheLM94021willalsoaffectthetemperaturereading.
Alternatively,theLM94021canbemountedinsideasealed-endmetaltube,andcanthenbedippedintoabathorscrewedintoathreadedholeinatank.
AswithanyIC,theLM94021andaccompanyingwiringandcircuitsmustbekeptinsulatedanddry,toavoidleakageandcorrosion.
Thisisespeciallytrueifthecircuitmayoperateatcoldtemperatureswherecondensationcanoccur.
IfmoisturecreatesashortcircuitfromtheoutputtogroundorVDD,theoutputfromtheLM94021willnotbecorrect.
Printed-circuitcoatingsareoftenusedtoensurethatmoisturecannotcorrodetheleadsorcircuittraces.
Thethermalresistancejunctiontoambient(θJA)istheparameterusedtocalculatetheriseofadevicejunctiontemperatureduetoitspowerdissipation.
TheequationusedtocalculatetheriseintheLM94021'sdietemperatureis(6)whereTAistheambienttemperature,IQisthequiescentcurrent,IListheloadcurrentontheoutput,andVOistheoutputvoltage.
Forexample,inanapplicationwhereTA=30°C,VDD=5V,IDD=9μA,GainSelect=11,VOUT=2.
231mV,andIL=2μA,thejunctiontemperaturewouldbe30.
021°C,showingaself-heatingerrorofonly0.
021°C.
SincetheLM94021'sjunctiontemperatureistheactualtemperaturebeingmeasured,careshouldbetakentominimizetheloadcurrentthattheLM94021isrequiredtodrive.
Table3showsthethermalresistanceoftheLM94021.
Table3.
LM94021ThermalResistanceDEVICENUMBERPACKAGENUMBERTHERMALRESISTANCE(θJA)LM94021BIMGDCK0005A415°C/WNOISECONSIDERATIONSTheLM94021hasexcellentnoiserejection(theratiooftheACsignalonVOUTtotheACsignalonVDD).
Duringbenchtests,sinewaverejectionof54dBorbetterwasobservedover200Hzto10kHz;Also,28dBorbetterwasobservedfrom10kHzto1MHz.
Aloadcapacitorontheoutputcanhelpfilternoise;forexample,a1nFloadcapacitorresultedin51dBorbetterfrom200Hzto1MHz.
ThereisnospecificrequirementfortheuseofabypasscapacitorclosetotheLM94021becauseitdoesnotdrawtransientcurrents.
Foroperationinverynoisyenvironments,somebypasscapacitancemayberequired.
ThecapacitancedoesnotneedtobeincloseproximitytotheLM94021.
TheLM94021hasbeenbenchtestedsuccessfullywithabypasscapacitorasfaras6inchesaway.
Infact,itcanbepoweredbyaproperly-bypassedlogicgate.
CAPACITIVELOADSTheLM94021handlescapacitiveloadingwell.
Inanextremelynoisyenvironment,orwhendrivingaswitchedsamplinginputonanADC,itmaybenecessarytoaddsomefilteringtominimizenoisecoupling.
Withoutanyprecautions,theLM94021candriveacapacitiveloadlessthanorequalto1100pFasshowninFigure14.
Forcapacitiveloadsgreaterthan1100pF,aseriesresistormayberequiredontheoutput,asshowninFigure15.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
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comFigure14.
LM94021NoDecouplingRequiredforCapacitiveLoadsLessthan1100pFFigure15.
LM94021withSeriesResistorforCapacitiveLoadinggreaterthan1100pFOUTPUTVOLTAGESHIFTTheLM94021isverylinearovertemperatureandsupplyvoltagerange.
DuetotheintrinsicbehaviorofanNMOS/PMOSrail-to-railbuffer,aslightshiftintheoutputcanoccurwhenthesupplyvoltageisrampedovertheoperatingrangeofthedevice.
ThelocationoftheshiftisdeterminedbytherelativelevelsofVDDandVOUT.
TheshifttypicallyoccurswhenVDD-VOUT=1.
0V.
Thisslightshift(afewmillivolts)takesplaceoverawidechange(approximately200mV)inVDDorVOUT.
Sincetheshifttakesplaceoverawidetemperaturechangeof5°Cto20°C,VOUTisalwaysmonotonic.
TheaccuracyspecificationsintheELECTRICALCHARACTERISTICStablealreadyincludethispossibleshift.
SELECTABLEGAINFOROPTIMIZATIONANDINSITUTESTINGTheGainSelectdigitalinputscanbetiedtotherailsorcanbedrivenfromdigitaloutputssuchasmicrocontrollerGPIOpins.
Inlow-supplyvoltageapplications,theabilitytoreducethegainto5.
5mV/°CallowstheLM94021tooperateoverthefull50°Cto150°Crange.
Whenalargersupplyvoltageispresent,thegaincanbeincreasedashighas13.
6mV/°C.
Thelargergainisoptimalforreducingtheeffectsofnoise(forexample,noisecouplingontheoutputlineorquantizationnoiseinducedbyananalog-to-digitalconverterwhichmaybesamplingtheLM94021output).
AnotherapplicationadvantageofthedigitallyselectablegainistheabilitytoperformdynamictestingoftheLM94021whileitisrunninginasystem.
Bytogglingthelogiclevelsofthegainselectpinsandmonitoringtheresultantchangeintheoutputvoltagelevel,thehostsystemcanverifythefunctionalityoftheLM94021.
14SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021LM94021www.
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comSNIS138E–FEBRUARY2005–REVISEDJUNE2013APPLICATIONCIRCUITSFigure16.
CelsiusThermostatFigure17.
ConservingPowerDissipationwithShutdownMostCMOSADCsfoundinmicrocontrollersandASICshaveasampleddatacomparatorinputstructure.
WhentheADCchargesthesamplingcap,itrequiresinstantaneouschargefromtheoutputoftheanalogsourcesuchastheLM94021temperaturesensorandmanyopamps.
Thisrequirementiseasilyaccommodatedbytheadditionofacapacitor(CFILTER).
ThesizeofCFILTERdependsonthesizeofthesamplingcapacitorandthesamplingfrequency.
SincenotallADCshaveidenticalinputstages,thechargerequirementswillvary.
ThisgeneralADCapplicationisshownasanexampleonly.
Figure18.
SuggestedConnectiontoaSamplingAnalog-to-DigitalConverterInputStageCopyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback15ProductFolderLinks:LM94021LM94021SNIS138E–FEBRUARY2005–REVISEDJUNE2013www.
ti.
comREVISIONHISTORYChangesfromRevisionC(February2013)toRevisionDPageChangedlayoutofNationalDataSheettoTIformat1516SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LM94021PACKAGEOPTIONADDENDUMwww.
ti.
com27-Jul-2016Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Lead/BallFinish(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesLM94021MDAACTIVEDIESALEY0400Green(RoHS&noSb/Br)CallTILevel-1-NA-UNLIM-40to85LM94021BIMGNRNDSC70DCK51000TBDCallTICallTI-50to15021BLM94021BIMG/NOPBACTIVESC70DCK51000Green(RoHS&noSb/Br)CUSNLevel-1-260C-UNLIM-50to15021BLM94021BIMGX/NOPBACTIVESC70DCK53000Green(RoHS&noSb/Br)CUSNLevel-1-260C-UNLIM-50to15021BLM94021QBIMG/NOPBACTIVESC70DCK51000Green(RoHS&noSb/Br)CUSNLevel-1-260C-UNLIM-50to15021QLM94021QBIMGX/NOPBACTIVESC70DCK53000Green(RoHS&noSb/Br)CUSNLevel-1-260C-UNLIM-50to15021Q(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)EcoPlan-Theplannedeco-friendlyclassification:Pb-Free(RoHS),Pb-Free(RoHSExempt),orGreen(RoHS&noSb/Br)-pleasecheckhttp://www.
ti.
com/productcontentforthelatestavailabilityinformationandadditionalproductcontentdetails.
TBD:ThePb-Free/Greenconversionplanhasnotbeendefined.
Pb-Free(RoHS):TI'sterms"Lead-Free"or"Pb-Free"meansemiconductorproductsthatarecompatiblewiththecurrentRoHSrequirementsforall6substances,includingtherequirementthatleadnotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,TIPb-Freeproductsaresuitableforuseinspecifiedlead-freeprocesses.
Pb-Free(RoHSExempt):ThiscomponenthasaRoHSexemptionforeither1)lead-basedflip-chipsolderbumpsusedbetweenthedieandpackage,or2)lead-baseddieadhesiveusedbetweenthedieandleadframe.
ThecomponentisotherwiseconsideredPb-Free(RoHScompatible)asdefinedabove.
Green(RoHS&noSb/Br):TIdefines"Green"tomeanPb-Free(RoHScompatible),andfreeofBromine(Br)andAntimony(Sb)basedflameretardants(BrorSbdonotexceed0.
1%byweightinhomogeneousmaterial)(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
PACKAGEOPTIONADDENDUMwww.
ti.
com27-Jul-2016Addendum-Page2(6)Lead/BallFinish-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Lead/BallFinishvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
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TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
OTHERQUALIFIEDVERSIONSOFLM94021,LM94021-Q1:Catalog:LM94021Automotive:LM94021-Q1NOTE:QualifiedVersionDefinitions:Catalog-TI'sstandardcatalogproductAutomotive-Q100devicesqualifiedforhigh-reliabilityautomotiveapplicationstargetingzerodefectsTAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantLM94021BIMGSC70DCK51000178.
08.
42.
252.
451.
24.
08.
0Q3LM94021BIMG/NOPBSC70DCK51000178.
08.
42.
252.
451.
24.
08.
0Q3LM94021BIMGX/NOPBSC70DCK53000178.
08.
42.
252.
451.
24.
08.
0Q3LM94021QBIMG/NOPBSC70DCK51000178.
08.
42.
252.
451.
24.
08.
0Q3LM94021QBIMGX/NOPBSC70DCK53000178.
08.
42.
252.
451.
24.
08.
0Q3PACKAGEMATERIALSINFORMATIONwww.
ti.
com23-Sep-2013PackMaterials-Page1*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQLength(mm)Width(mm)Height(mm)LM94021BIMGSC70DCK51000210.
0185.
035.
0LM94021BIMG/NOPBSC70DCK51000210.
0185.
035.
0LM94021BIMGX/NOPBSC70DCK53000210.
0185.
035.
0LM94021QBIMG/NOPBSC70DCK51000210.
0185.
035.
0LM94021QBIMGX/NOPBSC70DCK53000210.
0185.
035.
0PACKAGEMATERIALSINFORMATIONwww.
ti.
com23-Sep-2013PackMaterials-Page2IMPORTANTNOTICETexasInstrumentsIncorporatedanditssubsidiaries(TI)reservetherighttomakecorrections,enhancements,improvementsandotherchangestoitssemiconductorproductsandservicesperJESD46,latestissue,andtodiscontinueanyproductorserviceperJESD48,latestissue.
Buyersshouldobtainthelatestrelevantinformationbeforeplacingordersandshouldverifythatsuchinformationiscurrentandcomplete.
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