Texas Instruments LMX2470 Bruksanvisning
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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.
Produktspecifikationer
| Varumärke: | Texas Instruments |
| Kategori: | ej kategoriserat |
| Modell: | LMX2470 |
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