Texas Instruments LMH6514 Bedienungsanleitung

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GAIN

200

ADC14155

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OUT

3

LATCH

RF

LO

LMH6514

V

CC

R

LOAD

LMH6514

www.ti.com

SNOSB06A–JANUARY2008–REVISEDMARCH2013

LMH6514600MHz,DigitalControlled,VariableGainAmplifier

CheckforSamples:LMH6514

1

FEATURES

DESCRIPTION

TheLMH6514isahighperformance,digitally

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•AdjustableGainwitha42dBRange

controlledvariablegainamplifier(DVGA).Itcombines

•Precise6.02dBGainSteps

precisiongaincontrolwithalownoise,ultra-linear,

•Parallel3BitGainControl

differentialamplifier.Typically,theLMH6514drivesa

highperformanceADCinabroadrangeofmixed

•OnChipRegisterGainSetting

signalanddigitalcommunicationapplicationssuchas

•FullyDifferentialSignalPath

mobileradioandcellularbasestationswhere

•SingleEndedtoDifferentialCapable

automaticgaincontrol(AGC)isrequiredtoincrease

systemdynamicrange.Whenusedinconjunction

•200ΩInputImpedance

withahighspeedADC,systemdynamicrangecan

•SmallFootprint(4mmx4mm)WQFNPackage

beextendedbyupto42dB.

TheLMH6514hasadifferentialinputandoutput

APPLICATIONS

allowinglargesignalswingsonasingle5Vsupply.It

•CellularBaseStations

isdesignedtoacceptsignalsfromRFelementsand

•IFSamplingReceivers

maintainaterminatedimpedanceenvironment.The

inputimpedanceis200Ωresistive.Theoutput

•Instrumentation

impedanceiseither200Ωor400Ωandisuser

•Modems

selectable.Auniqueinternalarchitectureallowsuse

•Imaging

withbothsingleendedanddifferentialinputsignals.

•DifferentialLineReceiver

InputsignalstotheLMH6514arescaledbyahighly

linear,digitallycontrolledattenuatorwithseven

KEYSPECIFICATIONS

accurate6dBsteps.Theattenuatoroutputprovides

theinputsignalforahighgain,ultralineardifferential

•600MHzbandwidthat100Ωload

transconductor.Thetransconductordifferentialoutput

•39dBmOIP3at75MHz,200Ωload

currentcanbeconvertedintoavoltagebyusingthe

•26dBto38dBmaximumgain

on-chip200Ωor400Ωloads.Thetransconductance

gainis0.1Amp/Voltresultinginamaximumvoltage

•Selectableoutputimpedanceof200Ωor400Ω.

gainof+32dBwhendrivinga200Ωload,or38dB

•8.3dBnoisefigure

whendrivingthe400Ωload.

•5nsgainstepswitchingtime

TheLMH6514operatesovertheindustrial

•100mAsupplycurrent

temperaturerangeof−40°Cto+85°C.TheLMH6514

isavailableina16-Pin,thermallyenhanced,WQFN

package.

TypicalApplication

1

Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2008–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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