Unity国外bt下载网站

LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013LMH1251YPBPRtoRGBHVConverterand2:1VideoSwitchCheckforSamples:LMH12511FEATURESDESCRIPTIONTheLMH1251isawideband2:1analogvideoswitch23YPBPRtoRGBHVConversionwithanintegratedYPBPRtoRGBHVconverter.
TheYPBPRPath:70MHz,3dB,700mVPPdeviceacceptsonesetofYPBPRinputsandonesetBandwidthofRGB/HSYNC/VSYNCinputs.
BasedontheinputRGBPath:400MHz,3dB,700mVPPselected,theoutputwillbeeitheradecodedTVorbufferedPCvideosignal.
BandwidthSupportsPCVideoDisplayResolutionsuptoTheLMH1251hasaSYNCseparatorandprocessorUXGA(1600x1200@75Hz)thatiscapableofextractingsynctiminginformationfrombothStandardDefinitionTelevision(SDTV)andSupports480i,480p,576i,576p,720p,1080i,HighDefinitionTelevision(HDTV)inputs.
Itprovidesand1080pbi-levelsync,andtri-levelsyncseparation.
SmartVideoFormatDetectionforSDandHDThecolorspaceconversionfromYPBPRtoRGBinPowerSaveModetheLMH1251isrealizedwithaveryhighprecisionfullyanalogdematrixerwhichprovidessuperiorAPPLICATIONSchromaaccuracythatislessthan2.
5%ofamplitudeand1.
5°ofphaseerroronavectorscope.
ItisTFTLCDMonitorequippedwithasmartvideodetectioncircuitwhichCRTMonitorautomaticallysensesSDTVandHDTVvideoformatsSet-TopBoxandappliestheappropriatecolorspaceconversion.
DisplayProjectorTheLMH1251iscapableofhandlingSDTV,HDTV,XGA,SXGA,andUXGAvideoformats,whichmakesitanidealsolutionforenhancingvalueinapplicationsrangingfromLCDmonitors,toset-topboxes,toprojectors.
TheLMH1251ispartoftheLMHhighspeedamplifierfamily,andisofferedina24-pinTSSOPpackage.
1Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
2LMHisatrademarkofTexasInstruments.
3Allothertrademarksarethepropertyoftheirrespectiveowners.
PRODUCTIONDATAinformationiscurrentasofpublicationdate.
Copyright2005–2013,TexasInstrumentsIncorporatedProductsconformtospecificationsperthetermsoftheTexasInstrumentsstandardwarranty.
Productionprocessingdoesnotnecessarilyincludetestingofallparameters.
LMH1251SNLS193J–AUGUST2005–REVISEDMARCH2013www.
ti.
comConnectionDiagramFigure1.
24-PinTSSOP-TopViewSeePWPackageTruthTable-InputSelectPin24OUT0RGBHVinputCh1YPBPRinputChTruthTable-Format/ConversionSelectPin23Pin22SYNCFormatDetectionConversionScheme00Bi-LevelManual480i/480p01Tri-LevelManual720p/1080i1Outputs0(1)Bi-LevelAuto480i/480p1Outputs1(1)Tri-LevelAuto720p/1080i(1)WhenPin23issethigh,theLMH1251isinAutoMode,inwhichitcandetecttheincomingvideoformat(SDorHD)andapplytheappropriatecolorconversionandsyncprocessing.
WithAutoMode,Pin22becomesanoutputpin,andwilleitheroutputalogichighorlowtonotifytheuseroftheformatthatisbeingdetectedbytheLMH1251.
IfPin23issetlow,theLMH1251isinManualMode,inwhichtheusermustspecifytheformatwithPin22.
WithManualMode,Pin22isaninputpin.
SincePin22isabi-directionalpin,caremustbegivennottoapplyanyvoltagestoitwhenitisintheAutoMode,inwhichitfunctionsasanoutputpin.
TheuseoftheAutoModewithPin22leftfloatingistypicallyrecommended.
TruthTable-PowerSavePin21LowPowerMode0Disable1Enabled2SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LMH1251LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013Thesedeviceshavelimitedbuilt-inESDprotection.
TheleadsshouldbeshortedtogetherorthedeviceplacedinconductivefoamduringstorageorhandlingtopreventelectrostaticdamagetotheMOSgates.
AbsoluteMaximumRatings(1)(2)(3)ESDToleranceSusceptibility(4)4.
0kVMachineModel(5)400VSupplyVoltageVCC,Pins7and175.
5VVoltageatanyInputPin(VIN)VCC0.
5≥VIN≥0VVideoInputs(pk-pk)0.
0V≤VIN≤1.
2VThermalResistancetoAmbient(θJA)110°C/WThermalResistancetoCase(θJC)25°C/WJunctionTemperature(TJ)+150°CStorageTemperatureRange65°Cto+150°CLeadTemperature(soldering10sec.
)265°C(1)AbsoluteMaximumRatingsindicatelimitsbeyondwhichdamagetothedevicemayoccur.
OperatingRatingsindicateconditionsforwhichthedeviceisintendedtobefunctional,butspecificperformanceisnotensured.
Forensuredspecifications,seetheElectricalCharacteristicstables.
(2)AllvoltagesaremeasuredwithrespecttoGND,unlessotherwisespecified.
(3)IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheTexasInstrumentsSalesOffice/Distributorsforavailabilityandspecifications.
(4)HumanBodyModel,applicablestd.
MIL-STD-883,Method3015.
7.
MachineModel,applicablestd.
JESD22-A115-A(ESDMMstd.
ofJEDEC)Field-InducedCharge-DeviceModel,applicablestd.
JESD22-C101-C(ESDFICDMstd.
ofJEDEC).
(5)TheMachineModelESDtestiscoveredbyspecificationEIAJIC-121-1981.
A200pFcapischargedtothespecificvoltage,thendischargeddirectlyintotheICwithnoexternalseriesresistor(resistanceofdischargepathmustbeunder50).
OperatingRatings(1)OperatingTemperatureRange(2)20°Cto+80°CSupplyVoltage(VCC)4.
75V≤VCC≤5.
25VRGBVideoInputs(pk-pk)0.
0V≤VIN≤0.
7VYVideoInputs(incl.
Sync)-0.
3V≤VIN≤0.
7VPBPRVideoInputs-0.
35V≤VIN≤0.
35V(1)OperatingRatingsindicateconditionsforwhichthedeviceisfunctional,butdonotensurespecificperformancelimits.
Allvideoinputsmustbeproperlyterminated.
(2)ThemaximumpowerdissipationisafunctionofTJ(MAX),θJA.
ThemaximumallowablepowerdissipationatanyambienttemperatureisPD=(TJ(MAX)–TA)/θJA.
AllnumbersapplyforpackagessoldereddirectlyontoaPCBoard.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback3ProductFolderLinks:LMH1251LMH1251SNLS193J–AUGUST2005–REVISEDMARCH2013www.
ti.
comVideoSignalElectricalCharacteristicsUnlessotherwisenoted:TA=25°C,VCC=+5.
0V,RGBVideoIN=0.
7VPP,YVideoIN=0.
7VPP,PBPRVideoIN=±350mV,CL=8pF,VideoOutputs=0.
7VPP.
SymbolParameterConditionsMin(1)Typ(2)Max(1)UnitsIS,RGBSupplyCurrentNoOutputLoading,80kHz283441mAIS,YPBPRSupplyCurrentNoOutputLoading,480p607080mAsee(3)IS-PSSupplyCurrent,PowerSaveModePowerSaveMode,NoOutput4812mALoading,80kHz,see(3)IOUTOutputCurrent3mAVOBLKTypicalDCActiveVideoBlackLevel1.
82.
12.
4VDCOutputVoltageGainRGBRGBVideoUnityGainRGBVideoIN=0.
7VPP0.
07dBCh-ChMatchRGBRGBChtoChMatchingRGBVideoIN=0.
7VPP0.
02dBLERGBRGBInput:LinearityErrorStaircaseInputSignal0%see(4)VideoTimeDomainResponseRGBtrRGBInput:10%to90%,ACInputSignal(5)1.
55nsVideoRiseTimeRGBOSRRGBInput:ACInputSignal(5)3%RisingEdgeOvershootRGBtfRGBInput:90%to10%,ACInputSignal(5)1.
55nsVideoFallTimeRGBOSFRGBInput:ACInputSignal(5)3%RisingEdgeOvershootSDYPBPRtrSDYPBPRInput:10%to90%,ACInputSignal(5)1.
54nsVideoRiseTimeRGBOSFRGBInput:(5),ACInputSignal3%FallingEdgeOvershootSDYPBPRtrSDYPBPRInput:10%to90%,ACInputSignal(5)15.
4nsVideoRiseTimeSDYPBPROSRSDYPBPRInput:ACInputSignal(5)3%RisingEdgeOvershootSDYPBPRtfSDYPBPR:90%to10%,ACInputSignal(5)15.
4nsVideoFallTimeSDYPBPROSFSDYPBPR:ACInputSignal(5)3%FallingEdgeOvershootHDYPBPRtrHDYPBPRInput:10%to90%,ACInputSignal(5)8.
4nsVideoRiseTimeHDYPBPROSRHDYPBPRInput:ACInputSignal(5)3%RisingEdgeOvershootHDYPBPRtfHDYPBPR:90%to10%,ACInputSignal(5)8.
4nsVideoFallTimeHDYPBPROSFHDYPBPR:ACInputSignal(5)3%FallingEdgeOvershoot(1)Datasheetmin/maxspecificationlimitsarespecifiedbydesign,test,orstatisticalanalysis.
Theensuredspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaychangewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Typicalvaluesrepresentthemostlikelyparametricnormasdeterminedatthetimeofcharacterization.
Actualtypicalvaluesmayvaryovertimeandwillalsodependontheapplicationandconfiguration.
Thetypicalvaluesarenottestedandarenotensuredonshippedproductionmaterial.
(3)ThesupplycurrentspecifiedisthequiescentcurrentforVCCand5VwithRL=∞.
Loadresistorsarenotrequiredandarenotusedinthetestcircuit;therefore,allthesupplycurrentisusedbythedevice.
(4)LinearityErroristhemaximumvariationinstepheightofa16stepstaircaseinputsignalwaveformwitha0.
7VPPlevelattheinput.
All16arestepsequal,witheachatleast100nsinduration.
(5)InputfromRGBsignalgenerator:tr,tf=1.
5ns.
InputfromSDTVYPBPRsignalgenerator:tr,tf=15ns.
InputfromHDTVYPBPRsignalgenerator:tr,tf=8ns.
4SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LMH1251LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013VideoSignalElectricalCharacteristics(continued)Unlessotherwisenoted:TA=25°C,VCC=+5.
0V,RGBVideoIN=0.
7VPP,YVideoIN=0.
7VPP,PBPRVideoIN=±350mV,CL=8pF,VideoOutputs=0.
7VPP.
SymbolParameterConditionsMin(1)Typ(2)Max(1)UnitsVideoFrequencyDomainResponseRGBBWRGBInput:LargeSignalBW400MHzChannelBandwidth(3dB)YPBPRBWYPBPRInput(SD&HD):LargeSignalBW70MHzChannelBandwidth(3dB)VSEPCh-ChVideoAmplifier10MHzIsolation(6)50dB10MHzRGBChanneltoChannelVSEPINPUT-INPUTVideoAmplifier10MHzIsolation(6)55dB10MHzRGBInputtoYPBPRInputSNRSignaltoNoiseRatioACInputSignal,CL=8pF(6)55dB(6)Measureoutputlevelsoftheothertwoundrivenamplifiersrelativetothedrivenamplifiertodeterminechannelseparation.
Terminatetheundrivenamplifierinputstosimulategeneratorloading.
RepeattestatfIN=10MHzforVSEP10MHz.
ColorConversionAccuracyUnlessotherwisenoted:TA=25°C,VCC=+5.
0V,YVideoIN=0.
7VPP,PBPRVideoIN=±350mV,CL=8pF,VideoOutputs=0.
7VPP.
SymbolParameterConditionsMin(1)Typ(2)Max(1)UnitsVCOLORERROR|PBPR|AmplitudeYPBPRVideoInput,±0.
3±2.
5%(CalculatedfromRGBOutputs)100%ColorBar(any3colors),(3)θCOLORERRORPBPRPhaseAngleYPBPRVideoInput,±0.
2±1.
5deg(CalculatedfromRGBOutputs)100%ColorBar(any3colors),(3)(1)Datasheetmin/maxspecificationlimitsarespecifiedbydesign,test,orstatisticalanalysis.
Theensuredspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaychangewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Typicalvaluesrepresentthemostlikelyparametricnormasdeterminedatthetimeofcharacterization.
Actualtypicalvaluesmayvaryovertimeandwillalsodependontheapplicationandconfiguration.
Thetypicalvaluesarenottestedandarenotensuredonshippedproductionmaterial.
(3)Anythreecolorbarsignalscanbeusedastestsignals.
TheRGBoutputsshallbeusedtocalculatetheamplitudesandphasesofthechromaresults.
Theseshouldfallwithinthelimitsspecified.
SyncSignalElectricalCharacteristicsUnlessotherwisenoted:TA=25°C,VCC=+5.
0V,YVideoIN=0.
7VPP,PBPRVideoIN=±350mV,CL=8pF,VideoOutputs=0.
7VPP.
SymbolParameterConditionsMin(1)Typ(2)Max(1)UnitsVSYNCLH&VSYNCLowInputPins1&20.
51.
5VVSYNCHH&VSYNCHighInputPins1&23.
0VCC+0.
5VIO-SYNCHH&VSYNCCurrentSink/Source5kLoad3mACapabilitytR/F-SYNCH&VSYNCRise/FallTime15nstSYNC-WIDTHH&VSYNCWidthErrorRelativetoH&VSYNCInput5%H&VSYNCInputtY-SYNC-WIDTHH&VSYNCWidthErrorRelativetoCompositeSYNConYInput5%CompositeSYNCSonYtSYNC-DELAY50%ofH&VSYNCInputtoOutputH&VSYNCInput40nstY-HSYNC-DELAY50%ofHSYNCInputtoOutputCompositeSYNConYInput(Not70nsDuringVerticalPeriod)(1)Datasheetmin/maxspecificationlimitsarespecifiedbydesign,test,orstatisticalanalysis.
Theensuredspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaychangewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Typicalvaluesrepresentthemostlikelyparametricnormasdeterminedatthetimeofcharacterization.
Actualtypicalvaluesmayvaryovertimeandwillalsodependontheapplicationandconfiguration.
Thetypicalvaluesarenottestedandarenotensuredonshippedproductionmaterial.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback5ProductFolderLinks:LMH1251LMH1251SNLS193J–AUGUST2005–REVISEDMARCH2013www.
ti.
comSystemInterfaceSignalCharacteristicsUnlessotherwisenoted:TA=25°C,VCC=+5.
0V,YVideoIN=0.
7VPP,PBPRVideoIN=±350mV,CL=8pF,VideoOutputs=0.
7VPP.
SymbolParameterConditionsMin(1)Typ(2)Max(1)UnitsVILLogicLowInputVoltage0.
51.
5V(Pins24,23,22,21)VIHLogicHighInputVoltage3.
0VCC+0.
5V(Pins24,23,22,21)ILLogicLowInputCurrentInputVoltage=0.
4V±10A(Pins24,23,22,21)IHLogicHighInputCurrentInputVoltage=0.
4V±10A(Pins24,23,22,21)VOLLogicLowOutputVoltageIO=3mA0.
5V(Pins24,23,22,21)(1)Datasheetmin/maxspecificationlimitsarespecifiedbydesign,test,orstatisticalanalysis.
Theensuredspecificationsapplyonlyforthetestconditionslisted.
Someperformancecharacteristicsmaychangewhenthedeviceisnotoperatedunderthelistedtestconditions.
(2)Typicalvaluesrepresentthemostlikelyparametricnormasdeterminedatthetimeofcharacterization.
Actualtypicalvaluesmayvaryovertimeandwillalsodependontheapplicationandconfiguration.
Thetypicalvaluesarenottestedandarenotensuredonshippedproductionmaterial.
6SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LMH1251LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013TypicalPerformanceCharacteristicsUnlessotherwisenoted:TA=25°C,VCC=+5.
0V,RGBVideoIN=0.
7VPP,YVideoIN=0.
7VPP,PBPRVideoIN=±350mV,CL=8pF,VideoOutputs=0.
7VPP.
LargeSignalFrequencyResponseCrosstalkvs.
FrequencyFigure2.
Figure3.
PulseResponseHarmonicDistortionvs.
FrequencyFigure4.
Figure5.
720pColorBarVectorscopeFigure6.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback7ProductFolderLinks:LMH1251LMH1251SNLS193J–AUGUST2005–REVISEDMARCH2013www.
ti.
comAPPLICATIONINFORMATIONGENERALINFORMATIONTheLMH1251isahighspeedtriple2:1videomultiplexerwithanintegratedsyncprocessorandcolorspaceconverter.
OneinputchannelacceptsstandardRGBHVPCgraphicsvideoandthesecondinputchannelacceptsYPBPRcomponentvideo.
IfthefirstinputoftheMUXisselected,thedevicewilloutputtheRGBHVvideofromtheinputwithunitygain.
IfthesecondinputoftheMUXisselected,syncprocessingandcolorspaceconversionwillbeperformedontheYPBPRcomponentsignalstoprovideanequivalentRGBHVsignalattheoutput.
YPBPRtoRGBHVPROCESSINGTheLMH1251iscapableofprocessing480i,480p,576i,576p,720p,1080i,and1080pYPBPRcomponentvideosignalsonly.
S-Video,compositeNTSC,orcompositePALvideowillnotbeconvertedbytheLMH1251.
ForHighDefinition,720pand1080i/1080pvideo,theLMH1251willconvertthelumaandchromasignalsintoprimaryRGBsignalsaccordingtothelineararithmeticformulaspecifiedintheEIA/CEA-770.
3-CStandardforHighDefinitionAnalogComponentTV.
ForStandardDefinitionvideo,theLMH1251willperformtheconversionaccordingtothelineararithmeticformulaspecifiedintheEIA/CEA-770.
2-CStandardforStandardDefinitionAnalogComponentTV.
Theadvancedanalogarchitecturethatisemployedtoperformthecolorspaceconversionisprecisetowithin2.
5%ofamplitudeand1.
5°ofphaseerroronavectorscopewithacolorbartestsignal.
Thisisillustratedwithavectorscopeplotofaconvertedcolorbarsignalinthe720pformatshownTypicalPerformanceCharacteristics.
Notethatalthough480i/576icomponentvideoissupportedbytheLMH1251,mostPCdisplaymonitorscannothandlesuchlinerates.
Typically,only480p,576p,720p,and1080i/1080parewithinthedisplayablelineraterangeofLCDandCRTmonitors.
Furthermore,thescalerinLCDmonitorsystemsmustincludeade-interlacerforittodisplayinterlacedvideosuchaswith1080i.
ComponentVideoFormatsSupportedByTheLMH1251480i*480p576i*576p720p1080iat25,29.
97,and30Hzframerate1080pat25,29.
97,and30HzframerateNOTE*TheseformatswithMacrovisionarenotsupported.
SeeMACROVISIONCOMPATIBILITYformoreinformation.
AUTO/MANUALFORMATDETECTIONTheLMH1251caneitherautomaticallydetecttheinputformatofthecomponentvideosource,oritcanbeputinamanualmodewheretheMCUhastheflexibilitytospecifywhichYPBPRtoRGBHVprocessingschemeforthedevicetoapplydependingontheinputformat.
IfalogichighisappliedtoPin23,theLMH1251willbeintheAUTOdetectionmode,whichistypicallyrecommended.
Inthismode,thedevicewillappropriatelyusetheproperYPBPRtoRGBprocessingschemebasedonitsinputformatdetection.
IfalogiclowisappliedtoPin23,theLMH1251willbeinthemanualdetectionmode.
Inthismode,theMCUmustapplyalogiclowtoPin22iftheprocessingschemeisforSDTVvideoformats,andalogichighiftheprocessingschemeisforHDTVformats.
NotethatintheAUTOmode,Pin22becomesanoutputpin,andoutputsalogiclowifanSDvideoinputisdetectedandalogichighifanHDvideoinputisdetected,asnotificationtotheMCU.
8SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LMH1251LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013MACROVISIONCOMPATIBILITYTheLMH1251iscompatiblewiththeMacrovisionVideoCopyProtectionSystemcommonlyusedin480p/576pprogressive-scanDVDvideosources.
TheLMH1251doesnotsupport480i/576iformatswithMacrovisionenabled.
Macrovision,whichisenabledbyspecialcircuitryinsidemanyDVDplayers,embedspseudosyncpulsesandpseudovideopulsesintothesourcesignalduringtheverticalblankinginterval.
Thissystemisintendedtoprohibitanddeteranalogvideorecording.
For480p/576pformatswithMacrovisionenabled,theinternalsyncprocessoroftheLMH1251willoutputthetrueHsyncpulsesonlyandeffectivelyignorethepseudosyncpulses;itsvideoprocessorwillapplyproperSDTVcolorspaceconversion,andthepseudovideopulseswillpassthroughtocomplywithMacrovision.
POWERSAVEMODETheLMH1251isequippedwithapowersavingmodewhichiscontrolledbyPin21.
Thispinisalogiclevelinput.
ThedevicewillenteralowpowermodewhenthepowersavepinisappliedwithalogichighbytheMCU.
Undertheseconditions,theICreducesitscurrentconsumptiontoaminimumasspecifiedinVideoSignalElectricalCharacteristics.
However,thesyncprocessorandswitchwillalwaysremainactive.
Duringpowersavemode,theRGBvideooutputsareheldtotheblanklevel,whilethesyncsignalsareallowedtocontinuetobeprocessedand/orpassedthrough.
BasedontheabsenceorpresenceofsyncsignalsattheoutputoftheLMH1251,theMCUcandeterminewhethertobringthesystemtoalowpowerconsumptionstate.
INTERNALVOLTAGEREFERENCEProperoperationoftheLMH1251requiresaveryaccuratereferencevoltage.
ThisvoltageisgeneratedintheVREFblock.
TheoutputoftheVREFstagegoestoanumberofblocksinthevideosectionsandsetstheinternalbias.
Toinsureanaccuratevoltageovertemperature,anexternalresistorisusedtosetthecurrentintheVREFstage.
TheexternalresistorisconnectedtoPin15.
Thisresistorshouldbe1%andhaveatemperaturecoefficientunder100ppm/°C.
HSYNCANDVSYNCCHARACTERISTICSWhentheRGBHVinputisselected,theLMH1251willproduceHandVsyncoutputsignalsofthesamesyncpolaritiesastheHandVsyncinputsignals.
Forexample,VESAstandardtiminginputsignalswithpositive,leadingedgesyncpulseswillproducepositive,leadingedgepulsesintheHandVsyncoutputsignals.
HoweverwhentheYPBPRinputisselected,bothsyncoutputsarealwayspositive,leadingedgesyncs,setbytheinternalsyncprocessor.
DisplaysystemstypicallysynclocktonegativeedgesofHandVsyncsignals,andsomedisplaysmayhavepolaritycorrectiontoaccommodateeitherpositiveornegativeedges.
LogicinverterscanbeusedtoinverttheHandVsyncoutputsignalsoftheLMH1251tosatisfythenegativeedgerequirement.
ItisworthnotingthatwhenYPBPRisselectedwithanSDTVinputformat,someHsyncoutputpulseswillbehalfthewidthofthenormalHsyncpulsesduetothenarrowequalizationpulsesintheverticalblankinginterval.
WhentheHsyncsignalchangesfromfulltohalfwidthpulses,orviceversa,theHsyncperiodorscanratechangeswithrespecttothenegativesyncedges.
ThesebriefchangesintheHsyncperiodmaycauseanegative-edgetriggeredhorizontalPLLtolosesynclockmomentarily,whichcancausetheon-screenpicturetodistortorblankrepeatedly.
Thisconditioncanberectifiedusingalogicinvertertoproducenegative,leadingedgeHsyncpulses.
WhentheinvertedHsyncsignalchangesfromfulltohalfwidthpulses,orviceversa,theHsyncperiodwillremainconstantwithrespecttothenegativeedges,whichiscorrectHsyncoperationfornegative-edgetriggereddisplays.
OUTPUTDRIVECHARACTERISTICSTheLMH1251isdesignedtointerfacewithanADCorpreamplifierthroughanACcouplingcapacitorasshownbelowinFigure7.
TheRGBoutputsoftheLMH1251are700mVPPvideosignalswiththeblacklevelatapproximately2.
1V(typ),whichisthechip'sinternalvoltagereferencelevel.
TheHsyncandVsyncoutputsignalsareCMOSlogicoutputsthatswingrail-to-rail.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback9ProductFolderLinks:LMH1251LMH1251SNLS193J–AUGUST2005–REVISEDMARCH2013www.
ti.
comTheRGBHVoutputscannotbeusedtodrivestandard150videoloadsandrequirehigh-bandwidthbuffersforthiskindofapplication.
Forexample,iftheLMH1251istobedesignedintoastand-aloneconverterboxapplication,theconfigurationinFigure8isrecommended.
TodriveadisplaymonitoroverastandardVGAcable,awideband,lowdistortiontriplevideobuffer,suchastheLMH6739,canbeusedwithagainof+2todrivetheRGBvideosignalsoftheLMH1251,andlogicinverterscanbeusedtodriveitsHandVsyncsignals.
Figure7.
TypicalLMH1251Application10SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LMH1251LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013Figure8.
SimplifiedApplicationDiagramforDrivingaVGACableLAYOUTCONSIDERATIONSThemostimportantpointtonoteregardingthelayoutoftheLMH1251onaPCBisthatthetracelengthbetweentheoutputpinsoftheLMH1251andtheinputACcouplingcapacitorsofthenextstageADCorpreamplifiermustbeasminimalaspossible.
ThetracelengthsoftheHSyncandVSyncoutputsshouldalsobeminimized,asthecapacitiveloadingontheseoutputsmustnotexceed6pF.
ForlongsignalpathsleadinguptotheinputoftheLMH1251,controlledimpedancelinesshouldbeused,alongwithimpedancematchingelements.
Bypasscapacitorsshouldbeplacedascloseaspossibletothesupplypinsofthedevice.
Thelargerelectrolyticbypasscapacitorcanbelocatedfartherfromthedevice.
The10kexternalresistorshouldalsobeplacedascloseaspossibletotheREXTpin.
AllvideosignalsmustbekeptawayfromtheREXTpin(15).
Thispinhasaveryhighinputimpedanceandwillpickupanyhighfrequencysignalsroutednearit.
Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback11ProductFolderLinks:LMH1251LMH1251SNLS193J–AUGUST2005–REVISEDMARCH2013www.
ti.
comTestCircuitFigure9.
TestCircuit12SubmitDocumentationFeedbackCopyright2005–2013,TexasInstrumentsIncorporatedProductFolderLinks:LMH1251LMH1251www.
ti.
comSNLS193J–AUGUST2005–REVISEDMARCH2013REVISIONHISTORYChangesfromRevisionI(March2013)toRevisionJPageChangedlayoutofNationalDataSheettoTIformat12Copyright2005–2013,TexasInstrumentsIncorporatedSubmitDocumentationFeedback13ProductFolderLinks:LMH1251PACKAGEOPTIONADDENDUMwww.
ti.
com10-Dec-2020Addendum-Page1PACKAGINGINFORMATIONOrderableDeviceStatus(1)PackageTypePackageDrawingPinsPackageQtyEcoPlan(2)Leadfinish/Ballmaterial(6)MSLPeakTemp(3)OpTemp(°C)DeviceMarking(4/5)SamplesLMH1251MT/NOPBACTIVETSSOPPW2461RoHS&GreenSNLevel-1-260C-UNLIM0to70LMH1251MT(1)Themarketingstatusvaluesaredefinedasfollows:ACTIVE:Productdevicerecommendedfornewdesigns.
LIFEBUY:TIhasannouncedthatthedevicewillbediscontinued,andalifetime-buyperiodisineffect.
NRND:Notrecommendedfornewdesigns.
Deviceisinproductiontosupportexistingcustomers,butTIdoesnotrecommendusingthispartinanewdesign.
PREVIEW:Devicehasbeenannouncedbutisnotinproduction.
Samplesmayormaynotbeavailable.
OBSOLETE:TIhasdiscontinuedtheproductionofthedevice.
(2)RoHS:TIdefines"RoHS"tomeansemiconductorproductsthatarecompliantwiththecurrentEURoHSrequirementsforall10RoHSsubstances,includingtherequirementthatRoHSsubstancedonotexceed0.
1%byweightinhomogeneousmaterials.
Wheredesignedtobesolderedathightemperatures,"RoHS"productsaresuitableforuseinspecifiedlead-freeprocesses.
TImayreferencethesetypesofproductsas"Pb-Free".
RoHSExempt:TIdefines"RoHSExempt"tomeanproductsthatcontainleadbutarecompliantwithEURoHSpursuanttoaspecificEURoHSexemption.
Green:TIdefines"Green"tomeanthecontentofChlorine(Cl)andBromine(Br)basedflameretardantsmeetJS709Blowhalogenrequirementsof<=1000ppmthreshold.
Antimonytrioxidebasedflameretardantsmustalsomeetthe<=1000ppmthresholdrequirement.
(3)MSL,PeakTemp.
-TheMoistureSensitivityLevelratingaccordingtotheJEDECindustrystandardclassifications,andpeaksoldertemperature.
(4)Theremaybeadditionalmarking,whichrelatestothelogo,thelottracecodeinformation,ortheenvironmentalcategoryonthedevice.
(5)MultipleDeviceMarkingswillbeinsideparentheses.
OnlyoneDeviceMarkingcontainedinparenthesesandseparatedbya"~"willappearonadevice.
IfalineisindentedthenitisacontinuationofthepreviouslineandthetwocombinedrepresenttheentireDeviceMarkingforthatdevice.
(6)Leadfinish/Ballmaterial-OrderableDevicesmayhavemultiplematerialfinishoptions.
Finishoptionsareseparatedbyaverticalruledline.
Leadfinish/Ballmaterialvaluesmaywraptotwolinesifthefinishvalueexceedsthemaximumcolumnwidth.
ImportantInformationandDisclaimer:TheinformationprovidedonthispagerepresentsTI'sknowledgeandbeliefasofthedatethatitisprovided.
TIbasesitsknowledgeandbeliefoninformationprovidedbythirdparties,andmakesnorepresentationorwarrantyastotheaccuracyofsuchinformation.
Effortsareunderwaytobetterintegrateinformationfromthirdparties.
TIhastakenandcontinuestotakereasonablestepstoproviderepresentativeandaccurateinformationbutmaynothaveconducteddestructivetestingorchemicalanalysisonincomingmaterialsandchemicals.
TIandTIsuppliersconsidercertaininformationtobeproprietary,andthusCASnumbersandotherlimitedinformationmaynotbeavailableforrelease.
InnoeventshallTI'sliabilityarisingoutofsuchinformationexceedthetotalpurchasepriceoftheTIpart(s)atissueinthisdocumentsoldbyTItoCustomeronanannualbasis.
www.
ti.
comPACKAGEOUTLINEC22X0.
652X7.
1524X0.
300.
19TYP6.
66.
21.
2MAX0.
150.
050.
25GAGEPLANE-80BNOTE44.
54.
3ANOTE37.
97.
70.
750.
50(0.
15)TYPTSSOP-1.
2mmmaxheightPW0024ASMALLOUTLINEPACKAGE4220208/A02/201711213240.
1CABPIN1INDEXAREASEEDETAILA0.
1CNOTES:1.
Alllineardimensionsareinmillimeters.
Anydimensionsinparenthesisareforreferenceonly.
DimensioningandtolerancingperASMEY14.
5M.
2.
Thisdrawingissubjecttochangewithoutnotice.
3.
Thisdimensiondoesnotincludemoldflash,protrusions,orgateburrs.
Moldflash,protrusions,orgateburrsshallnotexceed0.
15mmperside.
4.
Thisdimensiondoesnotincludeinterleadflash.
Interleadflashshallnotexceed0.
25mmperside.
5.
ReferenceJEDECregistrationMO-153.
SEATINGPLANEA20DETAILATYPICALSCALE2.
000www.
ti.
comEXAMPLEBOARDLAYOUT0.
05MAXALLAROUND0.
05MINALLAROUND24X(1.
5)24X(0.
45)22X(0.
65)(5.
8)(R0.
05)TYPTSSOP-1.
2mmmaxheightPW0024ASMALLOUTLINEPACKAGE4220208/A02/2017NOTES:(continued)6.
PublicationIPC-7351mayhavealternatedesigns.
7.
Soldermasktolerancesbetweenandaroundsignalpadscanvarybasedonboardfabricationsite.
LANDPATTERNEXAMPLEEXPOSEDMETALSHOWNSCALE:10XSYMMSYMM112132415.
000METALSOLDERMASKOPENINGMETALUNDERSOLDERMASKSOLDERMASKOPENINGEXPOSEDMETALEXPOSEDMETALSOLDERMASKDETAILSNON-SOLDERMASKDEFINED(PREFERRED)SOLDERMASKDEFINEDwww.
ti.
comEXAMPLESTENCILDESIGN24X(1.
5)24X(0.
45)22X(0.
65)(5.
8)(R0.
05)TYPTSSOP-1.
2mmmaxheightPW0024ASMALLOUTLINEPACKAGE4220208/A02/2017NOTES:(continued)8.
Lasercuttingapertureswithtrapezoidalwallsandroundedcornersmayofferbetterpasterelease.
IPC-7525mayhavealternatedesignrecommendations.
9.
Boardassemblysitemayhavedifferentrecommendationsforstencildesign.
SOLDERPASTEEXAMPLEBASEDON0.
125mmTHICKSTENCILSCALE:10XSYMMSYMM1121324IMPORTANTNOTICEANDDISCLAIMERTIPROVIDESTECHNICALANDRELIABILITYDATA(INCLUDINGDATASHEETS),DESIGNRESOURCES(INCLUDINGREFERENCEDESIGNS),APPLICATIONOROTHERDESIGNADVICE,WEBTOOLS,SAFETYINFORMATION,ANDOTHERRESOURCES"ASIS"ANDWITHALLFAULTS,ANDDISCLAIMSALLWARRANTIES,EXPRESSANDIMPLIED,INCLUDINGWITHOUTLIMITATIONANYIMPLIEDWARRANTIESOFMERCHANTABILITY,FITNESSFORAPARTICULARPURPOSEORNON-INFRINGEMENTOFTHIRDPARTYINTELLECTUALPROPERTYRIGHTS.
TheseresourcesareintendedforskilleddevelopersdesigningwithTIproducts.
Youaresolelyresponsiblefor(1)selectingtheappropriateTIproductsforyourapplication,(2)designing,validatingandtestingyourapplication,and(3)ensuringyourapplicationmeetsapplicablestandards,andanyothersafety,security,orotherrequirements.
Theseresourcesaresubjecttochangewithoutnotice.
TIgrantsyoupermissiontousetheseresourcesonlyfordevelopmentofanapplicationthatusestheTIproductsdescribedintheresource.
Otherreproductionanddisplayoftheseresourcesisprohibited.
NolicenseisgrantedtoanyotherTIintellectualpropertyrightortoanythirdpartyintellectualpropertyright.
TIdisclaimsresponsibilityfor,andyouwillfullyindemnifyTIanditsrepresentativesagainst,anyclaims,damages,costs,losses,andliabilitiesarisingoutofyouruseoftheseresources.
TI'sproductsareprovidedsubjecttoTI'sTermsofSale(www.
ti.
com/legal/termsofsale.
html)orotherapplicabletermsavailableeitheronti.
comorprovidedinconjunctionwithsuchTIproducts.
TI'sprovisionoftheseresourcesdoesnotexpandorotherwisealterTI'sapplicablewarrantiesorwarrantydisclaimersforTIproducts.
MailingAddress:TexasInstruments,PostOfficeBox655303,Dallas,Texas75265Copyright2020,TexasInstrumentsIncorporated