CLC409
VeryWideband,LowDistortionMonolithicOpAmp
GeneralDescription
TheCLC409isaverywideband,DCcoupledmonolithicoperationalamplifierdesignedspecificallyforwidedynamicrangesystemsrequiringexceptionalsignalfidelity.Benefit-ingfromNational’scurrentfeedbackarchitecture,theCLC409offersagainrangeof±1to±10whileprovidingstable,oscillationfreeoperationwithoutexternalcompensa-tion,evenatunitygain.
Withits350MHzsmallsignalbandwidth(VOUT=2VPP),10-bitdistortionlevelsthrough20MHz(RL=100Ω),8-bit
inputreferreddistortionlevelsthrough60MHz,2.2nV/
noiseand13.5mAsupplycurrent,theCLC409istheidealdriverorbufferforhighspeedflashA/DandD/Aconverters.Widedynamicrangesystemssuchasradarandcommuni-cationreceiversrequiringawidebandamplifierofferingex-ceptionalsignalpuritywillfindtheCLC409’slowinputre-ferrednoiseandlowharmonicandintermodulationdistortionmakeitanattractivehighspeedsolution.
Constructedusinganadvanced,complimentarybipolarpro-cessandNational’sprovencurrentfeedbackarchitecture,theCLC409isavailableinseveralversionstomeetavarietyofrequirements.
EnhancedSolutions(Military/Aerospace)SMDNumber:5962-92034
Spacelevelversionsalsoavailable.
Formoreinformation,visithttp://www.national.com/mil
Features
nnnnnnn
350MHzsmallsignalbandwidth
-65/−72dBc2nd/3rdharmonics(20MHz)Lownoise
8nssettlingto0.1%1200V/µsslewrate
13.5mAsupplycurrent(±5V)60mAoutputcurrent
Applications
nnnnnnn
FlashA/Ddriver
D/AtransimpedancebufferWidedynamicrangeIFampRadar/communicationreceiversDDSpost-amps
WidebandinvertingsummerLinedriver
HarmonicDistortionvs.LoadandFrequency
01274804
ConnectionDiagrams
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CLC409AbsoluteMaximumRatings
(Note1)OperatingTemperatureRangeStorageTemperatureRangeLeadSolderDuration(+300˚C)ESDrating(humanbodymodel)
−40˚Cto+85˚C−65˚Cto+150˚C
10sec1000V
IfMilitary/Aerospacespecifieddevicesarerequired,pleasecontacttheNationalSemiconductorSalesOffice/Distributorsforavailabilityandspecifications.SupplyVoltage(VCC)
IOUTOutputisshortcircuitprotectedtoground,butmaximumreliabilitywillbemaintainedifIOUTdoesnotexceed...
CommonModeInputVoltageDifferentialInputVoltageJunctionTemperature
±7V
OperatingRatings
ThermalResistancePackage
60mA
MDIPSOICSOT23-5
(θJC)95˚C/W75˚C/W115˚C/W
(θJA)115˚C/W160˚C/W185˚C/W
±VCC10V+150˚C
ElectricalCharacteristics
AV=+2,VCC=±5V,RL=100Ω,Rf=250Ω;unlessspecifiedSymbol
AmbientTemperature
FrequencyDomainPerformanceSSBWLSBW
GainFlatness
GFPLGFPHGFR1GFR2LPDDG1DG2DP1DP2
TimeDomainResponseTRSTRLTSOSSRHD2LHD2HD2HHD3LHD3HD3H
EquivalentInputNoise
VNICNNCNSNFINV
Non-InvertingVoltageInvertingCurrentNon-InvertingCurrentTotalNoiseFloorTotalIntegratedNoise3rdHarmonicDistortionSettlingTimeto±0.1%OvershootSlewRate
2ndHarmonicDistortion
2VPP,5MHz2VPP,20MHz2VPP,60MHz2VPP,5MHz2VPP,20MHz2VPP,60MHz
RiseandFallTime
2VStep5VStep2VStep2VStep
1.33.5851200−86−65−49−84−72−592.214.33.2−15738
DifferentialPhasePeakingPeakingRolloffRolloff
LinearPhaseDeviationDifferentialGain-3dBBandwidth
VOUT<2VPPVOUT<5VPPVOUT<0.5VPPDCto75MHz
000.21.00.30.030.030.010.01350110
Parameter
ConditionsCLC409AJ
Typ+25˚C
−40˚C
Max/Min(Note2)+25˚C
+85˚C
Units
>250>90<0.4<0.8<1.0<2.0<0.8<0.07<0.07<0.02<0.02<1.6<4.2<12<15>1000<−78<−56<−41<−76<−65<−52<2.8<18<4.0<−155<47
>250>90<0.4<0.8<1.0<2.2<0.8<0.06<0.06<0.02<0.02<1.6<4.2<12<18>1000<−81<−56<−44<−76<−65<−52<2.8<18<4.0<−155<47
>200>80<0.4<0.8<1.0<3.0<1.0<0.06<0.06<0.02<0.02<1.6<4.6<12<18>1000<−81<−56<−44<−76<−65<−52<3.1<20<4.5<−154<52
MHzMHzdBdBdBdBdeg%%degdegnsnsns%V/µsdBcdBcdBcdBcdBcdBcnV/pA/pA/dBm1HzµV
>75MHz
DCto125MHz
@200MHz
DCto100MHzRL=150Ω,3.58MHzRL=150Ω,4.43MHzRL=150Ω,3.58MHzRL=150Ω,4.43MHz
DistortionAndNoiseResponse
>1MHz>1MHz>1MHz>1MHz
1MHzto150MHz
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CLC409ElectricalCharacteristics
AV=+2,VCCSymbol
Parameter
(Continued)
=±5V,RL=100Ω,Rf=250Ω;unlessspecified
Conditions
Typ
Max/Min(Note2)
Units
Static,DCPerformanceVIODVIOIBNDIBNIBIDIBIPSRRCMRRICCRINCINROVOCMIRIO
InputOffsetVoltage(Note3)AverageTemperatureCoefficientInputBiasCurrent(Note3)AverageTemperatureCoefficientInputBiasCurrent(Note3)AverageTemperatureCoefficientPowerSupplyRejectionRatioCommonModeRejectionRatioSupplyCurrent(Note3)Non-InvertingInputResistanceNon-InvertingInputCapacitanceOutputImpedanceOutputVoltageRangeCommonModeInputRangeOutputCurrent
DCRL=100ΩNoLoadInvertingNonInverting
0.5251010010100505013.5100010.1
<8.5<50<44<275<36<200>45>45<14.2>250<2<0.3>±3.0
±1.5
36
<4.5
-
<22
-
<20
-
>45>45<14.2>500<2<0.2>±3.2
±2.0
50
<9.5<50<22<125<30<100>45>45<14.2>1000<2<0.2>±3.2
±2.0
50
mVµV/˚CµAnA/˚CµAnA/˚CdBdBmAkΩpFΩVVmA
MiscellaneousPerformance
±3.5±2.2
60
Note1:“AbsoluteMaximumRatings”arethosevaluesbeyondwhichthesafetyofthedevicecannotbeguaranteed.Theyarenotmeanttoimplythatthedevicesshouldbeoperatedattheselimits.Thetableof“ElectricalCharacteristics”specifiesconditionsofdeviceoperation.
Note2:Max/minratingsarebasedonproductcharacterizationandsimulation.Individualparametersaretestedasnoted.Outgoingqualitylevelsaredeterminedfromtestedparameters.
Note3:AJ-level:spec.is100%testedat+25˚C.
OrderingInformation
Package8-pinplasticDIP8-pinplasticSOIC
5-pinSOT
TemperatureRange
Industrial−40˚Cto+85˚C−40˚Cto+85˚C−40˚Cto+85˚C
PartNumberCLC409AJPCLC409AJECLC409AJM5
PackageMarkingCLC409AJPCLC409AJE
A18
NSCDrawingN08EM08AMA05A
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TypicalPerformanceCharacteristics
UnlessSpecified).
Non-InvertingFrequencyResponse
(TA=25˚C,AV=+6,VCC=±5V,RL=100Ω,Rf=500Ω;
InvertingFrequencyResponse
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TypicalPerformanceCharacteristics(TA=25˚C,AV=+6,VCC=±5V,RL=100Ω,Rf=500Ω;
UnlessSpecified).(Continued)
HarmonicDistortionvs.LoadandFrequency
2-Tone,3rdOrderSpuriousLevels
01274807
3rdHarmonicDistortionvs.POUTTypicalD.C.Errorsvs.Temperature
01274808
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TypicalPerformanceCharacteristics(TA=25˚C,AV=+6,VCC=±5V,RL=100Ω,Rf=500Ω;
UnlessSpecified).(Continued)
EquivalentInputNoise
PSRR,CMRR,andClosedLoopROwww.national.com6
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CLC409ApplicationDivision
01274812
FIGURE1.RecommendedNon-InvertingGainCircuit
01274813
FIGURE2.RecommendedInvertingGainCircuit
FeedbackResistor
TheCLC409achievesitsexcellentpulseanddistortionper-formancebyusingthecurrentfeedbacktopologypioneeredbyComlinearCorporation.Theloopgainforacurrentfeed-backopamp,andhencethefrequencyresponse,ispre-dominantlysetbythefeedbackresistorvalue.TheCLC409isoptimizedforusewitha250Ωfeedbackresistor.Usinglowervaluescanleadtoexcessiveringinginthepulseresponsewhileahighervaluewilllimitthebandwidth.Appli-cationNoteOA-13discussesthisindetailalongwiththeoccasionswhereadifferentRfmightbeadvantageous.
HarmonicDistortion
TheCLC409hasbeenoptimizedforexceptionallylowhar-monicdistortionwhiledrivingverydemandingresistiveorcapacitiveloads.Generally,whenusedastheinputamplifiertoveryhighspeedflashADCs,thedistortionsintroducedbytheconverterwilldominateoverthelowCLC409distortionsshownontheplotsonthepreviouspage.The0.01µFca-pacitor(Css)shownacrossthesuppliesinFigure1andFigure2iscriticaltoachievingthelowest2ndharmonicdistortion.
The2-tone,3rdorderspuriousplotshowsarelativelycon-stantdifferencebetweenthetestpowerlevelandthespuri-ouslevelwiththatdifferencedependingonfrequency.The
7
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CLC409ApplicationDivision
(Continued)
CLC409doesnotshowanintercepttypeperformance.(wheretherelativespuriouslevelschangeata2Xratevs.thetesttonepowers),duetoaninternalfullpowerbandwidthenhancementcircuitthatbooststheperformanceastheoutputswingincreaseswhiledissipatingnegligiblequiescentpowerunderlowoutputpowerconditions.Thisfeatureen-hancesthedistortionperformanceandfullpowerbandwidthtomatchthatofmuchhigherquiescentsupplycurrentparts.
throughfromtheconvertsignal.Also,Cinisoftentimesavoltagedependentcapacitance.Thisinputimpedancenon-linearitywillinducedistortiontermsthatwillincreaseasRsisincreased.OnlyslightadjustmentsupordownfromtherecommendedRsvalueshouldthereforebeattemptedinoptimizingsystemperformance.
DCAccuracyandNoise
TheCLC409offersanimprovedoffsetvoltageoverthepincompatibleCLC400lowgainamplifier.TheoffsetadjustmentavailableontheCLC400wasthereforenotincludedinthispart.TheOutputOffsetequationbelowshowstheoutputoffsetcomputationequationforthenon-invertingconfigura-tionwithanexampleusingthetypicalbiascurrentandoffsetspecificationsforAV=+2.OutputOffset
VO=(±IbnRin±Vio)(1+Rf/Rg)±IbiRfExampleComputationforAV=+2,Rf=250Ω,Rin=25Ω:VO=(±10µA(25Ω)±0.5mV)2±10µA(250Ω)=±3.25mVThislowoutputoffsetvoltageisamarkedimprovementoverearlierveryhighspeedamplifiers.Furtherimprovementintheoutputoffsetvoltageanddriftispossibleusingthecom-positeamplifiersdescribedinApplicationNoteOA-7.
Thetwoinputbiascurrentsarephysicallyunrelatedinbothmagnitudeandpolarityforthecurrentfeedbacktopology.Itisnotpossible,therefore,tocanceltheireffectsbymatchingthesourceimpedanceforthetwoinputs(asiscommonlydoneformatchedinputbiascurrentdevices).
Thetotaloutputnoiseiscomputedinasimilarfashiontooutputoffsetvoltage.Usingtheinputnoisevoltageandtwoinputnoisecurrents,theoutputnoiseisdevelopedthroughthesamegainequationsforeachtermbutcombinedasthesquarerootofthesumofsquaredcontributingelements.SeeApplicationNoteOA-12forafulldiscussionofnoisecalculationsforcurrentfeedbackamplifiers.PrintedCircuitLayout
Aswithanyhighspeedcomponent,acarefulattentiontotheboardlayoutisnecessaryforoptimumperformance.Evalu-ationPCboards(CLC730013-DIP,CLC730027-SOIC,andCLC730068-SOT)fortheCLC409areavailable.Thisaddi-tionalsupplybypassingcapacitor,Css,caneasilybeaddedtotheboardifdesired.FurtherlayoutsuggestionscanbefoundinApplicationNoteOA-15.
01274820
FIGURE3.InputAmplifiertoADC
Figure3showsatypicalapplicationusingtheCLC409todriveanADC.Theseriesresistor,Rs,betweentheamplifieroutputandtheADCinputiscriticaltoachievingbestsystemperformance.Thisloadcapacitance,ifapplieddirectlytotheoutputpin,canquicklyleadtounacceptablelevelsofringinginthepulseresponse.TheplotofRsandsettlingtimevs.CLonthepreviouspageisanexcellentstartingpointforsettingRs.Thevaluederivedinthatplotminimizesthestepsettlingtimeintoafixeddiscretecapacitiveload.Severaladditionalconstraintsshouldbeconsidered,however,indrivingthecapacitiveinputoranADC.
ThereisanoptiontoincreaseRs,bandlimitingattheADCinputforeithernoiseorNyquistbandlimitingpurposes.In-creasingRstoomuch,however,caninduceanunacceptablylargeinputglitchduetoswitchingtransientscoupling
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CLC409PhysicalDimensions
unlessotherwisenoted
inches(millimeters)
8-PinMDIP
NSPackageNumberN08E
8-PinSOIC
NSPackageNumberM08A
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CLC409VeryWideband,LowDistortionMonolithicOpAmpPhysicalDimensions
inches(millimeters)unlessotherwisenoted(Continued)
5-PinSOT23
NSPackageNumberMA05A
LIFESUPPORTPOLICY
NATIONAL’SPRODUCTSARENOTAUTHORIZEDFORUSEASCRITICALCOMPONENTSINLIFESUPPORTDEVICESORSYSTEMSWITHOUTTHEEXPRESSWRITTENAPPROVALOFTHEPRESIDENTANDGENERALCOUNSELOFNATIONALSEMICONDUCTORCORPORATION.Asusedherein:1.Lifesupportdevicesorsystemsaredevicesorsystemswhich,(a)areintendedforsurgicalimplantintothebody,or(b)supportorsustainlife,andwhosefailuretoperformwhenproperlyusedinaccordancewithinstructionsforuseprovidedinthelabeling,canbereasonablyexpectedtoresultinasignificantinjurytotheuser.
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