Texas Instruments LMX2581E Handleiding

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LD

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Divider

Fractional

N Divider

2X

MUX

Serial Interface

Control

RFin

R

Divider

RFoutA

MUX

RFoutB

Multiple

Core VCO

MUX

MUX

MUXout

Vcc

Vcc

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LMX2581E

SNAS665–MAY2015

LMX2581EWidebandFrequencySynthesizerwithIntegratedVCO

1Features3Description

TheLMX2581Eisalow-noisewidebandfrequency

1

•OutputFrequencyfrom50to3800MHz

synthesizerthatintegratesadelta-sigmafractionalN

•InputClockFrequencyupto900MHz

PLL,multiplecoreVCO,programmableoutput

•PhaseDetectorFrequencyupto200MHz

divider,andtwodifferentialoutputbuffers.TheVCO

frequencyrangeisfrom1880to3800MHzandcan

•SupportsFractionalandIntegerModes

besentdirectlytotheoutputbuffersordivideddown

•–229dBc/HzNormalizedPLLPhaseNoise

byevenvaluesfrom2to38.Eachbufferiscapable

•–120.8dBc/HzNormalizedPLL1/fNoise

ofoutputpowerfrom–3to+12dBmat2700MHz.

Integratedlow-noiseLDOsareusedforsuperior

•–137dBc/HzVCOPhaseNoiseat1MHzoffset

noiseimmunityandconsistentperformance.

fora2.5GHzCarrier

•100fsRMSJitterinIntegerMode

Thissynthesizerisahighlyprogrammabledeviceand

itenablestheusertooptimizeitsperformance.In

•ProgrammableFractionalModulatorOrder

fractionalmode,thedenominatorandthemodulator

•ProgrammableFractionalDenominator

orderareprogrammableandcanbeconfiguredwith

•ProgrammableOutputPowerupto12dBm

ditheringaswell.Theuseralsohastheabilityto

directlyspecifyaVCOcoreorentirelybypassthe

•Programmable32LevelChargePumpCurrent

internalVCO.Finally,manyconvenientfeaturesare

•ProgrammableOptiontoUseanExternalVCO

includedsuchaspowerdown,Fastlock,automute,

•DigitalLockDetect

andlockdetection.Allregisterscanbeprogrammed

•3-WireSerialInterfaceandReadback

throughasimple3-wireinterfaceandareadback

featureisalsoavailable.

•SingleSupplyVoltagefrom3.15Vto3.45V

•SupportsLogicLevelsdownto1.6V

TheLMX2581Eoperatesonasingle3.3Vsupply

andcomesina32pin5.0mm×5.0mmWQFN

package.

2Applications

•WirelessInfrastructure(UMTS,LTE,WiMax,

DeviceInformation

(1)

Multi-StandardBaseStations)

PARTNUMBERPACKAGEBODYSIZE(NOM)

•BroadbandWireless

LMX2581EWQFN(32)DAP5.00mm×5.00mm

•TestandMeasurement

(1)Forallavailablepackages,seetheorderableaddendumat

•ClockGeneration

theendofthedatasheet.

4SimplifiedSchematic

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties