器件75岁老人开保时捷撞伤3行人

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,intellectualpropertymattersandotherimportantdisclaimers.
PRODUCTIONDATA.
EnglishDataSheet:SNOSD85LMV7239-Q1ZHCSI25–APRIL2018具具有有开开漏漏和和推推挽挽输输出出的的LMV7239-Q175ns、、超超低低功功耗耗、、低低压压、、轨轨至至轨轨输输入入比比较较器器11特特性性1符合汽车类标准具有符合AEC-Q100标准的下列特性:–器件温度1级:–40°C至125°C的环境工作温度范围–器件人体模型(HBM)静电放电(ESD)分类等级1C–器件CDMESD分类等级C5(DBV封装)VS=5V,TA=25°C(典型值,除非另有说明)传播延迟:75ns低电源电流:65A轨至轨输入开漏和推挽输出非常适合2.
7V和5V单电源应用采用节省空间的封装:–5引脚SOT-23–5引脚SC702应应用用便携式和电池供电类系统机顶盒高速差分线路接收器窗口比较器过零检测器高速采样电路3说说明明LMV7239-Q1是75ns超低功耗低压比较器.
此器件可在2.
7V至5.
5V的完整电源电压范围内正常运行.
该器件可实现75ns的传播延迟,而在5V电压下仅消耗65μA的电源电流.
LMV7239-Q1具有更大的轨至轨共模电压范围.
输入共模电压范围可基于地电压向下扩展200mV并基于电源电压向上扩展200mV,从而允许接地感应和电源感应.
LMV7239-Q1具有推挽式输出级.
凭借此特性,器件无需外部上拉电阻器即可运行.
LMV7239-Q1采用5引脚SC70和5引脚SOT-23封装,因此非常适合需要小尺寸和低功耗特性的系统.
器器件件信信息息(1)器器件件型型号号封封装装封封装装尺尺寸寸((标标称称值值))LMV7239-Q1SOT-23(5)2.
90mm*1.
60mmSC70(5)2.
00mm*1.
25mm(1)如需了解所有可用封装,请参阅数据表末尾的可订购产品附录.
电电源源电电流流与与电电源源电电压压间间的的关关系系传传播播延延迟迟与与过过驱驱动动2LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporated目目录录1特特性性.
12应应用用.
13说说明明.
14修修订订历历史史记记录录25PinConfigurationandFunctions.
36Specifications.
46.
1AbsoluteMaximumRatings46.
2ESDRatings.
46.
3RecommendedOperatingConditions.
46.
4ThermalInformation.
46.
5ElectricalCharacteristics,2.
7V56.
6ElectricalCharacteristics,5V66.
7TypicalCharacteristics.
77DetailedDescription107.
1Overview107.
2FunctionalBlockDiagram107.
3FeatureDescription.
107.
4DeviceFunctionalModes.
118ApplicationandImplementation158.
1ApplicationInformation.
158.
2TypicalApplications159PowerSupplyRecommendations.
1810Layout.
1910.
1LayoutGuidelines1910.
2LayoutExample1911器器件件和和文文档档支支持持2011.
1器件支持.
2011.
2文档支持2011.
3接收文档更新通知2011.
4社区资源.
2011.
5商标.
2011.
6静电放电警告.
2011.
7术语表2012机机械械、、封封装装和和可可订订购购信信息息.
204修修订订历历史史记记录录注:之前版本的页码可能与当前版本有所不同.
日日期期修修订订版版本本说说明明2018年4月*第一版.
将汽车器件从SNOS532移到独立的数据表,并更新电气特性,2.
7V和电气特性,5V表中的输入失调电压参数3LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporated5PinConfigurationandFunctionsDBVandDGKPackage5-PinSC70andSOT-23TopViewPinFunctionsPINI/ODESCRIPTIONNO.
NAME1VOUTOOutput2V-PNegativeSupply3IN+INoninvertingInput4IN-IInvertingInput5V+PPositiveSupply4LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporated(1)Stressesbeyondthoselistedunderabsolutemaximumratingsmaycausepermanentdamagetothedevice.
Thesearestressratingsonly,andfunctionaloperationofthedeviceattheseoranyotherconditionsbeyondthoseindicatedunderrecommendedoperatingconditionsisnotimplied.
Exposuretoabsolute-maximum-ratedconditionsforextendedperiodsmayaffectdevicereliability.
(2)Appliestobothsingle-supplyandsplit-supplyoperation.
Continuousshortcircuitoperationatelevatedambienttemperaturecanresultinexceedingthemaximumallowedjunctiontemperatureof150°C.
Outputcurrentsinexcessof±30mAoverlongtermmayadverselyaffectreliability.
(3)Limitinginputpincurrentisonlynecessaryforinputvoltagesthatexceedabsolutemaximuminputvoltageratings.
6Specifications6.
1AbsoluteMaximumRatingsOveroperatingfree-airtemperaturerange(unlessotherwisenoted)(1)MINMAXUNITDifferentialInputVoltage±SupplyVoltageVOutputShortCircuitDurationSee(2)SupplyVoltage(V+-V)6VSOLDERINGINFORMATIONInfraredorConvection(20sec)235°CWaveSoldering(10sec)260(leadtemp)°CVoltageatInput/OutputPins(V+)+0.
3,(V)0.
3VCurrentatInputPin(3)±10mAStorageTemperature,Tstg–65150°CJunctionTemperature,TJ150°C(1)JEDECdocumentJEP157statesthat250-VCDMallowssafemanufacturingwithastandardESDcontrolprocess.
Manufacturingwithlessthan250-VCDMispossiblewiththenecessaryprecautions.
6.
2ESDRatingsVALUEUNITV(ESD)ElectrostaticdischargeHuman-bodymodel(HBM),perAECQ100-002(1)±1000VCharged-devicemodel(CDM),perAECQ100-011(1)DBVpackageonly±750Machinemodel(MM)±100(1)ThemaximumpowerdissipationisafunctionofTJ(MAX),θJA.
ThemaximumallowablepowerdissipationatanyambienttemperatureisPD=(TJ(MAX)–TA)/θJA.
AllnumbersapplyforpackagessoldereddirectlyontoaPCB.
6.
3RecommendedOperatingConditionsMINMAXUNITSupplyVoltages(V+-V)2.
75.
5VTemperatureRange(1)–40125°C(1)Formoreinformationabouttraditionalandnewthermalmetrics,seetheSemiconductorandICPackageThermalMetricsapplicationreport.
6.
4ThermalInformationTHERMALMETRIC(1)LMV7239-Q1UNITDGK(SC70)DBV(SOT-23)5PINS5PINSRθJAJunction-to-ambientthermalresistance478265°C/W5LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporated(1)Alllimitsareensuredbytestingorstatisticalanalysis.
(2)Typicalvaluesrepresentthemostlikelyparametricnormasdeterminedatthetimeofcharacterization.
Actualtypicalvaluesmayvaryovertimeandwillalsodependontheapplicationandconfiguration.
Thetypicalvaluesarenottestedandarenotguaranteedonshippedproductionmaterial.
(3)CMRRisnotlinearoverthecommonmoderange.
Limitsareguaranteedovertheworstcasefrom0toVCC/2orVCC/2toVCC.
6.
5ElectricalCharacteristics,2.
7VUnlessotherwisespecified,alllimitsensuredforTA=25°C,VCM=V+/2,V+=2.
7V,V=0V.
PARAMETERTESTCONDITIONSMIN(1)TYP(2)MAX(1)UNITVOSInputOffsetVoltage–6±0.
8+6mVAttempextremes–8+8IBInputBiasCurrent30400nAAttempextremes600IOSInputOffsetCurrent5200nAAttempextremes400CMRRCommon-ModeRejectionRatio0V50dBV0.
10.
2to2.
9V++0.
1VAttempextremesVV+VOOutputSwingLowIL=4mA,VID=500mV230350mVAttempextremes450IL=0.
4mA,VID=500mV15ISSupplyCurrentNoload5285AAttempextremes100tPDPropagationDelayOverdrive=20mVCLOAD=15pF96nsOverdrive=50mVCLOAD=15pF87nsOverdrive=100mVCLOAD=15pF85nstrOutputRiseTimeLMV7239/LMV7239Q10%to90%1.
7nstfOutputFallTime90%to10%1.
7ns6LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporated(1)Alllimitsareensuredbytestingorstatisticalanalysis.
(2)Typicalvaluesrepresentthemostlikelyparametricnormasdeterminedatthetimeofcharacterization.
Actualtypicalvaluesmayvaryovertimeandwillalsodependontheapplicationandconfiguration.
Thetypicalvaluesarenottestedandarenotguaranteedonshippedproductionmaterial.
6.
6ElectricalCharacteristics,5VUnlessotherwisespecified,alllimitsensuredforTA=25°C,VCM=V+/2,V+=5V,V=0V.
PARAMETERTESTCONDITIONSMIN(1)TYP(2)MAX(1)UNITVOSInputOffsetVoltage–6±1+6mVAttempextremes–8+8IBInputBiasCurrent30400nAAttempextremes600IOSInputOffsetCurrent5200nAAttempextremes400CMRRCommon-ModeRejectionRatio0V50dBV0.
10.
2to5.
2V++0.
1VAttempextremesVV+VOOutputSwingLowIL=4mA,VID=500mV230350mVAttempextremes450IL=0.
4mA,VID=500mV10ISSupplyCurrentNoload6595AAttempextremes110tPDPropagationDelayOverdrive=20mVCLOAD=15pF89nsOverdrive=50mVCLOAD=15pF82nsOverdrive=100mVCLOAD=15pF75nstfOutputFallTime90%to10%1.
2ns7LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporated6.
7TypicalCharacteristics(Unlessotherwisespecified,VS=5V,CL=10pF,TA=25°C).
Figure1.
SupplyCurrentvs.
SupplyVoltageFigure2.
SourcingCurrentvs.
OutputVoltageFigure3.
SourcingCurrentvs.
OutputVoltageFigure4.
SinkingCurrentvs.
OutputVoltageFigure5.
SinkingCurrentvs.
OutputVoltageFigure6.
InputBiasCurrentvs.
InputVoltage8LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporatedTypicalCharacteristics(continued)(Unlessotherwisespecified,VS=5V,CL=10pF,TA=25°C).
Figure7.
InputBiasCurrentvs.
InputVoltageFigure8.
PropagationDelayvs.
TemperatureFigure9.
PropagationDelayvs.
TemperatureFigure10.
PropagationDelayvs.
CapacitiveLoadFigure11.
PropagationDelayvs.
CapacitiveLoadFigure12.
PropagationDelayvs.
InputOverdrive9LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporatedTypicalCharacteristics(continued)(Unlessotherwisespecified,VS=5V,CL=10pF,TA=25°C).
Figure13.
PropagationDelayvs.
InputOverdriveFigure14.
PropagationDelayvs.
Common-ModeVoltageFigure15.
PropagationDelayvs.
Common-ModeVoltage10LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporated7DetailedDescription7.
1OverviewTheLMV7239-Q1isanultralowpower,lowvoltage,75-nscomparator.
Theyareensuredtooperateoverthefullsupplyvoltagerangeof2.
7Vto5.
5V.
Thesedevicesachievea75-nspropagationdelaywhileconsumingonly65Aofsupplycurrentat5V.
TheLMV7239-Q1hasagreaterthanrail-to-railcommon-modevoltagerange.
Theinputcommon-modevoltagerangeextends200mVbelowgroundand200mVabovesupply,allowingbothgroundandsupplysensing.
7.
2FunctionalBlockDiagramFigure16.
SimplifiedSchematic7.
3FeatureDescription7.
3.
1InputStageTheLMV7239-Q1isarail-to-railinputandoutput.
Thetypicalinputcommon-modevoltagerangeof0.
2Vbelowthegroundto0.
2Vabovethesupply.
TheLMV7239-Q1usesacomplimentaryPNPandNPNinputstageinwhichthePNPstagesensescommon-modevoltagenearVandtheNPNstagesensescommon-modevoltagenearV+.
Ifeitheroftheinputsignalsfallsbelowthenegativecommonmodelimit,theparasiticPNjunctionformedbythesubstrateandthebaseofthePNPwillturnonresultinginanincreaseofinputbiascurrent.
Ifoneoftheinputsgoesabovethepositivecommonmodelimit,theoutputwillstillmaintainthecorrectlogiclevelaslongastheotherinputstayswithinthecommonmoderange.
However,thepropagationdelaywillincrease.
Whenbothinputsareoutsidethecommon-modevoltagerange,currentsaturationoccursintheinputstage,andtheoutputbecomesunpredictable.
Thepropagationdelaydoesnotincreasesignificantlywithlargedifferentialinputvoltages.
However,largedifferentialvoltagesgreaterthanthesupplyvoltageshouldbeavoidedtopreventdamagetotheinputstage.
7.
3.
2OutputStage:LMV7239-Q1TheLMV7239-Q1hasapush-pulloutput.
Whentheoutputswitches,thereisalowresistancepathbetweenVCCandground,causinghighoutputsinkingorsourcingcurrentduringthetransition.
11LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporatedFeatureDescription(continued)Figure17.
LMV7239-Q1Push-PullOutputStage7.
4DeviceFunctionalModes7.
4.
1CapacitiveandResistiveLoadsThepropagationdelayisnotaffectedbycapacitiveloadsattheoutputoftheLPV7239orLMV7239-Q1.
However,resistiveloadsslightlyeffectthepropagationdelayonthefallingedgedependingontheloadresistancevalue.
7.
4.
2NoiseMostcomparatorshaveratherlowgain.
Thisallowstheoutputtospendtimebetweenhighandlowwhentheinputsignalchangesslowly.
Theresultistheoutputmayoscillatebetweenhighandlowwhenthedifferentialinputisnearzero.
Thehighgainofthiscomparatoreliminatesthisproblem.
Lessthan1μVofchangeontheinputwilldrivetheoutputfromonerailtotheotherrail.
Iftheinputsignalisnoisy,theoutputcannotignorethenoiseunlesssomehysteresisisprovidedbypositivefeedback.
(SeeHysteresis.
)7.
4.
3HysteresisToimprovepropagationdelaywhenlowoverdriveisneededhysteresiscanbeadded.
7.
4.
3.
1InvertingComparatorWithHysteresisTheinvertingcomparatorwithhysteresisrequiresathreeresistornetworkthatisreferencedtothesupplyvoltageV+ofthecomparatorasshowninFigure18.
WhenVINattheinvertinginputislessthanVA,thevoltageatthenoninvertingnodeofthecomparator(VINThethreenetworkresistorscanberepresentedasR1//R3inserieswithR2.
12LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporatedDeviceFunctionalModes(continued)Figure18.
InvertingComparatorWithHysteresisThelowerinputtripvoltageVA1isdefinedas:VA1=VCCR2/[(R1//R3)+R2)](1)WhenVINisgreaterthanVA,theoutputvoltageisloworveryclosetoground.
InthiscasethethreenetworkresistorscanbepresentedasR2//R3inserieswithR1.
TheuppertripvoltageVA2isdefinedas:VA2=VCC(R2//R3)/[(R1)+(R2//R3)](2)ThetotalhysteresisprovidedbythenetworkisdefinedasΔVA=VA1-VA2.
(3)7.
4.
3.
2Non-InvertingComparatorWithHysteresisAnoninvertingcomparatorwithhysteresisrequiresatworesistornetwork,andavoltagereference(VREF)attheinvertinginput.
WhenVINislow,theoutputisalsolow.
Fortheoutputtoswitchfromlowtohigh,VINmustriseuptoVIN1whereVIN1iscalculatedby:(4)AssoonasVOswitchestoVCC,VAstepstoavaluegreaterthanVREFwhichisgivenby:(5)Tomakethecomparatorswitchbacktoitslowstate,VINmustequalVREFbeforeVAwillagainequalVREF.
VIN2canbecalculatedby:13LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporatedDeviceFunctionalModes(continued)(6)ThehysteresisofthiscircuitisthedifferencebetweenVIN1andVIN2.
ΔVIN=VCCR1/R2(7)Figure19.
NoninvertingComparatorWithHysteresisFigure20.
NoninvertingComparatorThresholds7.
4.
4ZeroCrossingDetectorInazerocrossingdetectorcircuit,theinvertinginputisconnectedtogroundandthenoninvertinginputisconnectedtoa100mVPPACsignal.
Asthesignalatthenoninvertinginputcrosses0V,thecomparator'soutputchangesstate.
Figure21.
SimpleZeroCrossingDetector7.
4.
4.
1ZeroCrossingDetectorWithHysteresisToimproveswitchingtimesandcenteringtheinputthresholdtogroundasmallamountofpositivefeedbackisaddedtothecircuit.
VoltagedividerR4andR5establishesareferencevoltage,V1,atthepositiveinput.
Bymakingtheseriesresistance,R1plusR2equaltoR5,theswitchingcondition,V1=V2,willbesatisfiedwhenVIN=0.
Thepositivefeedbackresistor,R6,ismadeverylargewithrespecttoR5||R6=2000R5).
Theresultanthysteresisestablishedbythisnetworkisverysmall(ΔV1<10mV)butitissufficienttoinsurerapidoutputvoltagetransitions.
DiodeD1isusedtoensurethattheinvertinginputterminalofthecomparatornevergoesbelowapproximately100mV.
Astheinputterminalgoesnegative,D1willforwardbias,clampingthenodebetweenR1andR2toapproximately700mV.
ThissetsupavoltagedividerwithR2andR3preventingV2fromgoingbelowground.
ThemaximumnegativeinputoverdriveislimitedbythecurrenthandlingabilityofD1.
14LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporatedDeviceFunctionalModes(continued)Figure22.
ZeroCrossingDetectorWithHysteresis7.
4.
5ThresholdDetectorInsteadoftyingtheinvertinginputto0V,theinvertinginputcanbetiedtoareferencevoltage.
AstheinputonthenoninvertinginputpassestheVREFthreshold,thecomparator'soutputchangesstate.
Itisimportanttouseastablereferencevoltagetoensureaconsistentswitchingpoint.
Figure23.
ThresholdDetector15LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporated8ApplicationandImplementationNOTEInformationinthefollowingapplicationssectionsisnotpartoftheTIcomponentspecification,andTIdoesnotwarrantitsaccuracyorcompleteness.
TI'scustomersareresponsiblefordeterminingsuitabilityofcomponentsfortheirpurposes.
Customersshouldvalidateandtesttheirdesignimplementationtoconfirmsystemfunctionality.
8.
1ApplicationInformationTheLMV7239-Q1isasinglesupplycomparatorwith75nsofpropagationdelayandonly65Aofsupplycurrent.
8.
2TypicalApplications8.
2.
1SquareWaveOscillatorFigure24.
SquareWaveOscillator8.
2.
1.
1DesignRequirementsAtypicalapplicationforacomparatorisasasquarewaveoscillator.
ThecircuitinFigure24generatesasquarewavewhoseperiodissetbytheRCtimeconstantofthecapacitorC1andresistorR4.
8.
2.
1.
2DetailedDesignProcedureThemaximumfrequencyislimitedbythelargesignalpropagationdelayofthecomparatorandbythecapacitiveloadingattheoutput,whichlimitstheoutputslewrate.
Figure25.
SquareWaveOscillatorTimingThresholdsConsidertheoutputofFigure24tobehightoanalyzethecircuit.
Thatimpliesthattheinvertedinput(VC)islowerthanthenoninvertinginput(VA).
ThiscausestheC1tobechargedthroughR4,andthevoltageVCincreasesuntilitisequaltothenoninvertinginput.
ThevalueofVAatthispointis:(8)IfR1=R2=R3,thenVA1=2Vcc/316LMV7239-Q1ZHCSI25–APRIL2018www.
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cnCopyright2018,TexasInstrumentsIncorporatedTypicalApplications(continued)Atthispointthecomparatorswitchespullingdowntheoutputtothenegativerail.
ThevalueofVAatthispointis:(9)IfR1=R2=R3,thenVA2=VCC/3.
ThecapacitorC1nowdischargesthroughR4,andthevoltageVCdecreasesuntilitisequaltoVA2,atwhichpointthecomparatorswitchesagain,bringingitbacktotheinitialstage.
ThetimeperiodisequaltotwicethetimeittakestodischargeC1from2VCC/3toVCC/3,whichisgivenbyR4C1·ln2.
Hencetheformulaforthefrequencyis:F=1/(2·R4·C1·ln2)(10)TheLMV7239shouldbeusedforasymmetricaloutput.
TheLMV7235willrequireapullupresistorontheoutputtofunction,andwillhaveaslightlyasymmetricaloutputduetothereducedsourcingcurrent.
8.
2.
1.
3ApplicationCurvesFigure26showsthesimulatedresultsofanoscillatorusingthefollowingvalues:1.
R1=R2=R3=R4=100kΩ2.
C1=100pF,CL=20pF3.
V+=5V,V–=GND4.
CSTRAY(notshown)fromVatoGND=10pFFigure26.
SquareWaveOscillatorOutputWaveform8.
2.
2CrystalOscillatorAsimplecrystaloscillatorusingtheLMV7239-Q1isshowninFigure27.
ResistorsR1andR2setthebiaspointatthecomparator'snoninvertinginput.
Resistors,R3andR4andcapacitorC1settheinvertinginputnodeatanappropriateDCaveragelevelbasedontheoutput.
Thecrystal'spathprovidesresonantpositivefeedbackandstableoscillationoccurs.
Theoutputdutycycleforthiscircuitisroughly50%,butitisaffectedbyresistortolerancesandtoalesserextentbythecomparator17LMV7239-Q1www.
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cnZHCSI25–APRIL2018Copyright2018,TexasInstrumentsIncorporatedTypicalApplications(continued)Figure27.
CrystalOscillator8.
2.
3Infrared(IR)ReceiverTheLMV7239-Q1canalsobeusedasaninfraredreceiver.
Theinfraredphotodiodecreatesacurrentrelativetotheamountofinfraredlightpresent.
ThecurrentcreatesavoltageacrossRD.
Whenthisvoltagelevelcrossthevoltageappliedbythevoltagedividertotheinvertinginput,theoutputtransitions.
Figure28.
IRReceiver8.
2.
4WindowDetectorFigure29.
WindowDetectorAwindowdetectormonitorstheinputsignaltodetermineifitfallsbetweentwovoltagelevels.
Bothoutputsaretrue(high)whenVREF1ti.
com.
cnCopyright2018,TexasInstrumentsIncorporatedTypicalApplications(continued)Figure30.
WindowDetectorOutputSignalThecomparatoroutputsAandBarehighonlywhenVREF1Othernamesforwindowdetectorsare:thresholddetector,leveldetector,andamplitudetriggerordetector.
9PowerSupplyRecommendationsTominimizesupplynoise,powersuppliesshouldbedecoupledbya0.
01-μFceramiccapacitorinparallelwitha10-μFcapacitor.
Duetothenanosecondedgesontheoutputtransition,peaksupplycurrentswillbedrawnduringthetimetheoutputistransitioning.
Peakcurrentdependsonthecapacitiveloadingontheoutput.
Theoutputtransitioncancausetransientsonpoorlybypassedpowersupplies.
Thesetransientscancauseapoorlybypassedpowersupplyto"ring"duetotraceinductanceandlowself-resonancefrequencyofhighESRbypasscapacitors.
TreattheLMV7239-Q1asahigh-speeddevice.
Keepthegroundpathsshortandplacesmall(lowESRceramic)bypasscapacitorsdirectlybetweentheV+andV–pins.
Outputcapacitiveloadingandoutputtoggleratewillcausetheaveragesupplycurrenttoriseoverthequiescentcurrent.
19LMV7239-Q1www.
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cnZHCSI25–APRIL2018版权2018,TexasInstrumentsIncorporated10Layout10.
1LayoutGuidelinesPropergroundingandtheuseofagroundplanewillhelptoensurethespecifiedperformanceoftheLMV7239-Q1.
Minimizingtracelengths,reducingunwantedparasiticcapacitanceandusingsurface-mountcomponentswillalsohelp.
Comparatorsareverysensitivetoinputnoise.
TheLMV7239-Q1requiresahigh-speedlayout.
Followtheselayoutguidelines:1.
Useprinted-circuitboardwithagood,unbrokenlow-inductancegroundplane.
2.
Placeadecouplingcapacitor(0.
1-F,ceramicsurface-mountcapacitor)ascloseaspossibletoVCCpin.
3.
Ontheinputsandtheoutput,keepleadlengthsasshortaspossibletoavoidunwantedparasiticfeedbackaroundthecomparator.
Keepinputsawayfromoutput.
4.
Solderthedevicedirectlytotheprinted-circuitboardratherthanusingasocket.
5.
Forslowmovinginputsignals,takecaretopreventparasiticfeedback.
Asmallcapacitor(1000pForless)placedbetweentheinputscanhelpeliminateoscillationsinthetransitionregion.
ThiscapacitorcausessomedegradationtotPDwhenthesourceimpedanceislow.
6.
Thetop-sidegroundplanerunsbetweentheoutputandinputs.
7.
Groundtracefromthegroundpinrunsunderthedeviceuptothebypasscapacitor,shieldingtheinputsfromtheoutputs.
10.
2LayoutExampleFigure31.
SOT-23BoardLayoutExample20LMV7239-Q1ZHCSI25–APRIL2018www.
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cn版权2018,TexasInstrumentsIncorporated11器器件件和和文文档档支支持持11.
1器器件件支支持持11.
1.
1开开发发支支持持TINA-TI基于SPICE的模拟仿真程序,http://www.
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cn/tool/cn/tina-tiDIP适配器评估模块,http://www.
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cn/tool/cn/dip-adapter-evmTI通用运行放大器评估模块,http://www.
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cn/tool/cn/opampevm11.
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TIE2E在在线线社社区区TI的的工工程程师师对对工工程程师师(E2E)社社区区.
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5商商标标E2EisatrademarkofTexasInstruments.
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6静静电电放放电电警警告告ESD可能会损坏该集成电路.
德州仪器(TI)建议通过适当的预防措施处理所有集成电路.
如果不遵守正确的处理措施和安装程序,可能会损坏集成电路.
ESD的损坏小至导致微小的性能降级,大至整个器件故障.
精密的集成电路可能更容易受到损坏,这是因为非常细微的参数更改都可能会导致器件与其发布的规格不相符.
11.
7术术语语表表SLYZ022—TI术语表.
这份术语表列出并解释术语、缩写和定义.
12机机械械、、封封装装和和可可订订购购信信息息以下页面包含机械、封装和可订购信息.
这些信息是指定器件的最新可用数据.
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PACKAGEOPTIONADDENDUMwww.
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LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
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Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
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Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
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Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
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(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
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TAPEANDREELINFORMATION*AlldimensionsarenominalDevicePackageTypePackageDrawingPinsSPQReelDiameter(mm)ReelWidthW1(mm)A0(mm)B0(mm)K0(mm)P1(mm)W(mm)Pin1QuadrantLMV7239QDBVRQ1SOT-23DBV53000178.
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SYMMLANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:15XPKG13452SOLDERMASKOPENINGMETALUNDERSOLDERMASKSOLDERMASKDEFINEDEXPOSEDMETALMETALSOLDERMASKOPENINGNONSOLDERMASKDEFINED(PREFERRED)SOLDERMASKDETAILSEXPOSEDMETALwww.
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