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LMX2581

SNAS601G–AUGUST2012–REVISEDSEPTEMBER2014

LMX2581WidebandFrequencySynthesizerwithIntegratedVCO

1Features3Description

TheLMX2581isalownoisewidebandfrequency

1

•OutputFrequencyfrom50to3760MHz

synthesizerthatintegratesadelta-sigmafractionalN

•InputClockFrequencyupto900MHz

PLL,multiplecoreVCO,programmableoutput

•PhaseDetectorFrequencyupto200MHz

divider,andtwodifferentialoutputbuffers.TheVCO

frequencyrangeisfrom1880to3760MHzandcan

•SupportsFractionalandIntegerModes

besentdirectlytotheoutputbuffersordivideddown

•–229dBc/HzNormalizedPLLPhaseNoise

byevenvaluesfrom2to38.Eachbufferiscapable

•–120.8dBc/HzNormalizedPLL1/fNoise

ofoutputpowerfrom-3to+12dBmat2700MHz.

IntegratedlownoiseLDOsareusedforsuperior

•–137dBc/HzVCOPhaseNoise@1MHzoffset

noiseimmunityandconsistentperformance.

fora2.5GHzCarrier

•100fsRMSJitterinIntegerMode

Thissynthesizerisahighlyprogrammabledeviceand

itenablestheusertooptimizeitsperformance.In

•ProgrammableFractionalModulatorOrder

fractionalmode,thedenominatorandthemodulator

•ProgrammableFractionalDenominator

orderareprogrammableandcanbeconfiguredwith

•ProgrammableOutputPowerupto+12dBm

ditheringaswell.Theuseralsohastheabilityto

directlyspecifyaVCOcoreorentirelybypassthe

•Programmable32LevelChargePumpCurrent

internalVCO.Finally,manyconvenientfeaturesare

•ProgrammableOptiontoUseanExternalVCO

includedsuchaspowerdown,Fastlock,automute,

•DigitalLockDetect

andlockdetection.Allregisterscanbeprogrammed

•3-WireSerialInterfaceandReadback

throughasimple3wireinterfaceandareadback

featureisalsoavailable.

•SingleSupplyVoltagefrom3.15Vto3.45V

•SupportsLogicLevelsdownto1.6V

TheLMX2581operatesonasingle3.3Vsupplyand

comesina32pin5.0mm×5.0mmWQFNpackage.

2Applications

DeviceInformation

(1)

•WirelessInfrastructure(UMTS,LTE,WiMax,

PARTNUMBERPACKAGEBODYSIZE(NOM)

Multi-StandardBaseStations)

LMX2581WQFN(32)5.00mm×5.00mm

•BroadbandWireless

(1)Forallavailablepackages,seetheorderableaddendumat

•TestandMeasurement

theendofthedatasheet.

•ClockGeneration

4SimplifiedSchematic

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Produktspecifikationer