Texas Instruments LMX2470 Handleiding

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LMX2470

www.ti.com

SNAS195B–MARCH2003–REVISEDMARCH2013

LMX24702.6GHzDelta-SigmaFractional-NPLLwith800MHzInteger-NPLL

CheckforSamples:LMX2470

1

FEATURES

DESCRIPTION

TheLMX2470isalowpower,highperformance

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•LowIn-BandPhaseNoiseandLowFractional

delta-sigmafractional-NPLLwithanauxiliaryinteger-

Spurs

NPLL.ThedeviceisfabricatedusingTI’sadvanced

•12Bitor22BitSelectableFractionalModulus

BiCMOSprocess.

•Upto4thOrderProgrammableDelta-Sigma

Withdelta-sigmaarchitecture,fractionalspur

Modulator

compensationisachievedwithnoiseshaping

•EnhancedAnti-CycleSlipFastlockCircuitry

capabilityofthedelta-sigmamodulatorandthe

inherentlowpassfilteringofthePLLloopfilter.

–Fastlock

Fractionalspursatlowerfrequenciesarepushedto

–CycleSlipReduction

higherfrequenciesoutsidetheloopbandwidth.Unlike

–IntegratedTimeoutCounters

analogcompensation,thedigitalfeedbacktechniques

usedintheLMX2470arehighlyresistanttochanges

•DigitalLockDetectOutput

intemperatureandvariationsinwaferprocessing.

•PrescalersAllowWideRangeofNValues

Withdelta-sigmaarchitecture,theabilitytopush

–RFPLL:16/17/20/21

closeinspurandphasenoiseenergytohigher

–IFPLL:8/9or16/17

frequenciesisadirectfunctionofthemodulator

order.Thehighertheorder,themorethisenergycan

•CrystalReferenceFrequencyupto110MHz

bespreadtohigherfrequencies.TheLMX2470hasa

•On-chipCrystalReferenceFrequencyDoubler.

programmablemodulatoruptoorderfour,which

•PhaseComparisonFrequencyupto30MHz

allowsthedesignertoselecttheoptimummodulator

ordertofitthephasenoise,spur,andlocktime

•HardwareandSoftwarePower-downControl

requirementsofthesystem.

•UltraLowConsumption:I

CC

=4.1mA(Typical)

Programmingisfastandsimple.Serialdatais

transferredintotheLMX2470viaathreeline

APPLICATIONS

MICROWIREinterface(Data,Clock,LoadEnable).

•CellularPhonesandBaseStations

Nominalsupplyvoltageis2.5V.TheLMX2470

–CDMA,WCDMA,GSM/GPRS,TDMA,EDGE,

featuresatypicalcurrentconsumptionof4.1mAat

2.5V.TheLMX2470isavailableina24lead3.5X

PDC

4.5X0.6mmpackage.

•ApplicationsRequiringFineFrequency

Resolution

•SatelliteandCableTVTuners

•WLANStandards

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2003–2013,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties