LMV7219_04资料

LMV72197nsec,2.7Vto5VComparatorwithRail-to-RailOutputNovember2004

LMV7219

7nsec,2.7Vto5VComparatorwithRail-to-RailOutput

GeneralDescription

TheLMV7219isalow-power,high-speedcomparatorwithinternalhysteresis.TheLMV7219operatingvoltagerangesfrom2.7Vto5Vwithpush/pullrail-to-railoutput.Thisdeviceachievesa7nspropagationdelaywhileconsumingonly1.1mAofsupplycurrentat5V.

TheLMV7219inputshaveacommonmodevoltagerangethatextends200mVbelowground,allowinggroundsensing.Theinternalhysteresisensurescleanoutputtransitionsevenwithslow-movinginputssignals.

TheLMV7219isavailableintheSC70-5andSOT23-5packages,whichareidealforsystemswheresmallsizeandlowpowerarecritical.

Features

(VS=5V,TA=25˚C,Typicalvaluesunlessspecified)nPropagationdelay7nsnLowsupplycurrent1.1mAnInputcommonmodevoltagerangeextends200mvbelowground

nIdealfor2.7Vand5VsinglesupplyapplicationsnInternalhysteresisensurescleanswitchingnFastriseandfalltime1.3nsnAvailableinspace-savingpackages:5-pinSC70-5andSOT23-5

Applications

nnnnnnn

Portableandbattery-poweredsystemsScanners

Settopboxes

HighspeeddifferentiallinereceiverWindowcomparatorsZero-crossingdetectors

High-speedsamplingcircuits

TypicalApplication

10105401

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LMV7219ConnectionDiagram

SC70-5/SOT23-5

10105402

TopView

OrderingInformation

Package

5-pinSC70-55-pinSOT23-5

PartNumberLMV7219M7LMV7219M7XLMV7219M5LMV7219M5X

MarkingC15C15C14AC14A

Suppliedas1kUnitsTapeandReel3kUnitsTapeandReel1kUnitsTapeandReel3kUnitsTapeandReel

NSCDrawingMAA05AMF05A

SimplifiedSchematic

10105403

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LMV7219AbsoluteMaximumRatings(Note1)

IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.ESDTolerance(Note2)

MachineBodyHumanModelBodyDifferentialInputVoltageOutputShortCircuitDurationSupplyVoltage(V+-V−)SolderingInformationInfraredorConvection(20sec)

WaveSoldering(10sec)

235˚C

260˚C(leadtemp)

150V2000V

VoltageatInput/OutputpinsCurrentatInputPin(Note9)

(V+)+0.4V(V−)−0.4V

±10mA

OperatingRatings

Supplyvoltages(V+-V−)OperatingTemperatureRange(Note4)

StorageTemperatureRangePackageThermalResistanceSC70-5SOT23-5

478˚C/W265˚C/W2.7Vto5V−40˚Cto+85˚C−65˚Cto+150˚C

±SupplyVoltage

(Note3)

5.5V

2.7VElectricalCharacteristics

Unlessotherwisespecified,alllimitsguaranteedforTJ=25˚C,VCM=V+/2,V+=2.7V,V−=0V,CL=10pFandRL>1MΩtoV−.Boldfacelimitsapplyatthetemperatureextremes.SymbolVOSIBIOSCMRRPSRRVCMParameter

InputOffsetVoltageInputBiasCurrentInputOffsetCurrent

CommonModeRejectionRatioPowerSupplyRejectionRatioInputCommon-VoltageRange

0V50dB

Conditions

Typ(Note5)

1450508585VCC−1−0.2

VOOutputSwingHigh

IL=4mA,VID=500mVIL=0.4mA,VID=500mV

OutputSwingLow

IL=−4mA,VID=−500mVIL=−0.4mA,VID=−500mV

ISCOutputShortCircuitCurrent

Sourcing,

VO=0V(Note3)Sinking,

VO=2.7V(Note3)

ISVHYSTVTRIP+VTRIP−

SupplyCurrent

InputHysteresisVoltageInputReferredPositiveTripPointInputReferredNegativeTripPoint

NoLoad(Note10)(seeFigure1)(seeFigure1)

VCC−0.22VCC−0.021301520200.973−4

8−81.62.2

mA

Limit(Note6)

68950200020040062556555VCC−1.2VCC−1.3−0.10VCC−0.3VCC−0.4VCC−0.05VCC−0.1520030050150

UnitsmVmaxnAmaxnAmaxdBmindBminVminVmaxVmin

mVmax

mAmaxmVmVmaxmVmin

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LMV72192.7VElectricalCharacteristics

SymboltPDParameter

PropagationDelay

(Continued)

Unlessotherwisespecified,alllimitsguaranteedforTJ=25˚C,VCM=V+/2,V+=2.7V,V−=0V,CL=10pFandRL>1MΩtoV−.Boldfacelimitsapplyatthetemperatureextremes.

Conditions

Overdrive=5mVVCM=0V(Note7)Overdrive=15mVVCM=0V(Note7)Overdrive=50mVVCM=0V(Note7)

Typ(Note5)12111012.52

20

nsnsnsnsmax

Limit(Note6)

Units

tSKEWtrtfPropagationDelaySkewOutputRiseTimeOutputFallTime

(Note8)10%to90%90%to10%

5VElectricalCharacteristics

Unlessotherwisespecified,alllimitsguaranteedforTJ=25˚C,VCM=V+/2,V+=5V,V−=0V,CL=10pFandRL>1MΩtoV−.Boldfacelimitsapplyatthetemperatureextremes.SymbolVOSIBIOSCMRRPSRRVCMParameter

InputOffsetVoltageInputBiasCurrentInputOffsetCurrent

CommonModeRejectionRatioPowerSupplyRejectionRatioInputCommon-ModeVoltageRange

0V50dB

Conditions

Typ(Note5)

1500508585VCC−1−0.2

VOOutputSwingHigh

IL=4mA,VID=500mVIL=0.4mA,VID=500mV

OutputSwingLow

IL=−4mA,VID=−500mVIL=−0.4mA,VID=−500mV

ISCOutputShortCircuitCurrent

Sourcing,VO=0V(Note3)Sinking,VO=5V(Note3)

ISVHYSTVTrip+VTrip−

SupplyCurrent

InputHysteresisVoltageInputReferredPositiveTripPointInputReferredNegativeTripPoint

NoLoad(Note10)(Seefigure1)(Seefigure1)

VCC−0.13VCC−0.02

801068651.17.53.5−4

8−8Limit(Note6)

68950200020040065556555VCC−1.2VCC−1.3−0.10VCC−0.2VCC−0.3VCC−0.05VCC−0.1518028050150302030201.82.4

UnitsmVmaxnAmaxnAmaxdBmindBminVminVmaxVmin

mVmax

mAminmAmaxmVmVmaxmVmin

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LMV72195VElectricalCharacteristics

SymboltPDParameter

PropagationDelay

(Continued)

Unlessotherwisespecified,alllimitsguaranteedforTJ=25˚C,VCM=V+/2,V+=5V,V−=0V,CL=10pFandRL>1MΩtoV−.Boldfacelimitsapplyatthetemperatureextremes.

Conditions

Overdrive=5mVVCM=0V(Note7)Overdrive=15mVVCM=0V(Note7)Overdrive=50mVVCM=0V(Note7)

Typ(Note5)

9870.41.31.25

2019

nsnsnsnsmax

Limit(Note6)

Units

tSKEWtrtfPropagationDelaySkewOutputRiseTimeOutputFallTime

(Note8)10%to90%90%to10%

Note1:AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.OperatingRatingsindicateconditionsforwhichthedeviceisintendedtobefunctional,butspecificperformanceisnotguaranteed.Forguaranteedspecificationsandthetestconditions,seetheElectricalcharacteristics.Note2:Humanbodymodel,1.5kΩinserieswith100pF.Machinemodel,200Ωinserieswith100pF.

Note3:Appliestobothsingle-supplyandsplit-supplyoperation.Continuousshortcircuitoperationatelevatedambienttemperaturecanresultinexceedingthemaximumallowedjunctiontemperatureof150˚C.Outputcurrentsinexcessof±30mAoverlongtermmayadverselyaffectreliability.

Note4:ThemaximumpowerdissipationisafunctionofTJ(MAX),θJA,andTA.ThemaximumallowablepowerdissipationatanyambienttemperatureisPD=(TJ(MAX)-TA)/θJA.AllnumbersapplyforpackagessoldereddirectlyintoaPCboard.Note5:TypicalValuesrepresentthemostlikelyparametricnorm.Note6:Alllimitsareguaranteedbytestingorstatisticalanalysis.

Note7:Propagationdelaymeasurementsmadewith100mVsteps.OverdriveismeasurerelativetoVTrip.Note8:PropagationDelaySkewisdefinedasabsolutevalueofthedifferencebetweentPDLHandtPDHL.

Note9:Limitinginputpincurrentisonlynecessaryforinputvoltagesthatexceedabsolutemaximuminputvoltageratings.

Note10:TheLMV7219comparatorhasinternalhysteresis.Thetrippointsaretheinputvoltageneededtochangetheoutputstateineachdirection.TheoffsetvoltageisdefinedastheaverageofVtrip+andVtrip−,whilethehysteresisvoltageisthedifferenceofthesetwo.

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LMV7219TypicalPerformanceCharacteristics

SupplyCurrentvs.SupplyVoltage

Unlessotherwisespecified,VS=5V,CL=10pF,TA=25˚C

VOSvs.SupplyVoltage

10105404

10105405

InputOffsetandTripVoltagevs.SupplyVoltageSourcingCurrentvs.OutputVoltage

1010540610105408

SourcingCurrentvs.OutputVoltageSinkingCurrentvs.OutputVoltage

1010540910105410

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LMV7219TypicalPerformanceCharacteristicsUnlessotherwisespecified,VS=5V,CL=10pF,TA=

25˚C(Continued)

PropagationDelayvs.Temperature

(VS=2.7V,VOD=15mV)

SinkingCurrentvs.OutputVoltage

1010541110105412

PropagationDelayvs.Temperature

(VS=5V,VOD=15mV)PropagationDelayvs.CapacitiveLoad

(VS=5V,VOD=15mV)

1010541310105414

PropagationDelayvs.InputOverdrive

PropagationDelay(tPD−)

10105416

10105415

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LMV7219TypicalPerformanceCharacteristicsUnlessotherwisespecified,VS=5V,CL=10pF,TA=

25˚C(Continued)

PropagationDelay(tPD+)

10105417

ApplicationSection

LMV7219isasinglesupplycomparatorwithinternalhyster-esis,7nsofpropagationdelayandonly1.1mAofsupplycurrent.

TheLMV7219hasatypicalinputcommonmodevoltagerangeof−0.2Vbelowthegroundto1VbelowVcc.ThedifferentialinputstageisapairofPNPtransistors,therefore,theinputbiascurrentflowsoutofthedevice.Ifeitheroftheinputsignalsfallsbelowthenegativecommonmodelimit,theparasiticPNjunctionformedbythesubstrateandthebaseofthePNPwillturnon,resultinginanincreaseofinputbiascurrent.

Ifoneoftheinputsgoesabovethepositivecommonmodelimit,theoutputwillstillmaintainthecorrectlogiclevelaslongastheotherinputstayswithinthecommonmoderange.However,thepropagationdelaywillincrease.Whenbothinputsareoutsidethecommonmodevoltagerange,currentsaturationoccursintheinputstage,andtheoutputbecomesunpredictable.

Thepropagationdelaydoesnotincreasesignificantlywithlargedifferentialinputvoltages.However,largedifferentialvoltagesgreaterthanthesupplyvoltageshouldbeavoidedtopreventdamagestotheinputstage.

TheLMV7219hasapushpulloutput.Whentheoutputswitches,thereisadirectpathbetweenVCCandground,causinghighoutputsinkingorsourcingcurrentduringthetransition.Afterthetransition,theoutputcurrentdecreasesandthesupplycurrentsettlesbacktoabout1.1mAat5V,thusconservingpowerconsumption.

Mosthigh-speedcomparatorsoscillatewhenthevoltageofoneoftheinputsisclosetoorequaltothevoltageontheotherinputduetonoiseorundesirablefeedback.TheLMV7219have7mVofinternalhysteresistocounterpara-siticeffectsandnoise.Thehysteresisdoesnotchangesignificantlywiththesupplyvoltagesandthecommonmodeinputvoltagesasreflectedinthespecificationtable.Theinternalhysteresiscreatestwotrippoints,onefortherisinginputvoltageandoneforthefallinginputvoltage.Thedifferencebetweenthetrippointsisthehysteresis.Withinternalhysteresis,whenthecomparator’sinputvoltagesareequal,thehysteresiseffectivelycausesonecomparator-inputvoltagetomovequicklypasttheother,thustakingtheinputoutoftheregionwhereoscillationoccurs.Standardcomparatorsrequirehysteresistobeaddedwithexternalresistors.Thefixedinternalhysteresiseliminatestheseresistors.

10105418

FIGURE1.InputandOutputWaveforms,Non-InvertingInputVaried

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LMV7219AdditionalHysteresis

Ifadditionalhysteresisisdesired,thiscanbedonewiththeadditionofthreeresistorsusingpositivefeedback,asshowninFigure2.Thepositivefeedbackmethodslowsthecom-paratorresponsetime.Calculatetheresistorvaluesasfol-lows:

1)SelectR3.ThecurrentthroughR3shouldbegreaterthantheinputbiascurrenttominimizeerrors.ThecurrentthroughR3(IF)atthetrippointis(VREF-VOUT)/R3.ConsiderthetwopossibleoutputstateswhensolvingforR3,andusethesmallerofthetworesultingresistorvalues.Thetwoformulasare:

(whenVOUT=0)R3=VREF/IF(VOUT=VCC)R3=VCC-VREF/IF2)Chooseahysteresisbandrequired(VHB).3)CalculateR1,whereR1=R3X(VHB/VCC)

4)ChoosethetrippointforVINrising.Thisisthethresholdvoltage(VTHR)atwhichthecomparatorswitchesfromlowtohighasVINrisesaboutthetrippoint.5)CalculateR2asfollows:

0.1µFceramicshouldbeplacedascloseaspossibletoV+pin.Anadditional2.2µFtantalumcapacitormayberequiredforextranoisereduction.

2.Keepallleadsshorttoreducestraycapacitanceandleadinductance.Itwillalsominimizeunwantedparasiticfeedbackaroundthecomparator.

3.ThedeviceshouldbesoldereddirectlytothePCboardinsteadofusingasocket.

4.UseaPCboardwithagood,unbrokenlowinductancegroundplane.Makesuregroundpathsarelow-impedance,especiallywereheaviercurrentsareflowing.

5.Inputtracesshouldbekeptawayfromoutputtraces.Thiscanbeachievedbyrunningatopsidegroundplanebetweentheoutputandinputs.

6.Runthegroundtraceunderthedeviceuptothebypasscapacitortoshieldtheinputsfromtheoutputs.

7.Topreventparasiticfeedbackwheninputsignalsareslow-moving,asmallcapacitorof1000pForlesscanbeplacedbetweentheinputs.Itcanalsohelpeliminateoscil-lationsinthetransitionregion.However,thiscapacitorcancausesomedegradationtotpdwhenthesourceimpedanceislow.

Zero-CrossingDetector

6)Verifythetripvoltageandhysteresisasfollows:

Theinvertinginputisconnectedtogroundandthenon-invertinginputisconnectedto100mVp-psignal.Asthesignalatthenon-invertinginputcrosses0V,thecompara-tor’soutputChangesState.

10105422

Thismethodisrecommendedforadditionalhysteresisofuptoafewhundredmillivolts.Beyondthat,theimpedanceofR3islowenoughtoaffectthebiasstringandadjustmentofR1maybealsorequired.

FIGURE3.Zero-CrossingDetector

ThresholdDetector

Insteadoftyingtheinvertinginputto0V,theinvertinginputcanbetiedtoareferencevoltage.Thenon-invertinginputisconnectedtotheinput.AstheinputpassestheVREFthresh-old,thecomparator’soutputchangesstate.

10105421

FIGURE2.AdditionalHysteresis

CircuitLayoutandBypassing

TheLMV7219requireshigh-speedlayout.Followtheselay-outguidelines:

1.Powersupplybypassingiscritical,andwillimprovesta-bilityandtransientresponse.Adecouplingcapacitorsuchas

10105423

FIGURE4.ThresholdDetector

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LMV7219CrystalOscillator

AsimplecrystaloscillatorusingtheLMV7219isshownbelow.ResistorsR1andR2setthebiaspointatthecom-parator’snon-invertinginput.ResistorsR3,R4andC1setstheinvertinginputnodeatanappropriateDCaveragelevelbasedontheoutput.Thecrystal’spathprovidesresonantpositivefeedbackandstableoscillationoccurs.Theoutputdutycycleforthiscircuitisroughly50%,butitisaffectedbyresistortolerancesandtoalesserextentbythecomparatoroffset.

IRReceiver

TheLMV7219isanidealcandidatetobeusedasaninfraredreceiver.Theinfraredphotodiodecreatesacurrentrelativetotheamountofinfraredlightpresent.ThecurrentcreatesavoltageacrossRD.Whenthisvoltagelevelcrossthevoltageappliedbythevoltagedividertotheinvertinginput,theoutputtransitions.

10105425

10105424

FIGURE6.IRReceiver

FIGURE5.CrystalOscillator

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LMV7219PhysicalDimensions

inches(millimeters)unlessotherwisenoted

5-PinSC70-5

NSPackageNumberMAA05A

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LMV72197nsec,2.7Vto5VComparatorwithRail-to-RailOutputPhysicalDimensions

inches(millimeters)unlessotherwisenoted(Continued)

5-PinSOT23-5

NSPackageNumberMF05A

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