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Charge

Pump

Serial Interface

CPoutVtune

CSB

SCK

SDI

Lock Detect or

Register Readback

x2

Ramp Generator

FSK Generator

OSCinP

OSCinM

RFoutBP

RFoutBM

RFoutAP

RFoutAM

MUXout

SYNCSysRefReq

MULT

,

÷2/4/8«/256

RampClkRampDir

CE

Pre-R

Divider

Post-R

Divider

Enable

Phase

Sync

û

Modulator

N-Divider

LDOs

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LMX2572LP

SNAS764–MAY2018

LMX2572LP2-GHzLowPowerWidebandRFSynthesizerWithFSKModulation

1

1Features

1

•OutputFrequency:12.5MHzto2GHz

•LowPowerConsumption:70mAat3.3-VSupply

•–124-dBc/HzPhaseNoiseat100-kHzOffsetWith

800-MHzCarrier

•PLLFigureofMerit:–232dBc/Hz

•PLLNormalized1/fNoise:–123.5dBc/Hz

•32-BitFractional-NDivider

•RemoveIntegerBoundarySpursWith

ProgrammableInputMultiplier

•SynchronizationofOutputPhaseAcrossMultiple

Devices

•SupportforRampandChirpFunctions

•SupportforFSKDirectDigitalModulation

•TwoProgrammableOutputPowerLevel

DifferentialOutputs

•FastVCOCalibrationSpeed:<20µs

•Single3-Vto3.5-VPowerSupply

2Applications

•TestandMeasurementEquipment

•Digital2-WayRadios

•LowPowerRadioCommunicationSystems

•SatelliteCommunication

•WirelessMicrophones

•ProprietyWirelessConnectivity

•MIMO

•High-SpeedDataConverterClocking

3Description

TheLMX2572LPisalow-power,high-performance

widebandsynthesizerthatcangenerateone

frequencyfrom12.5MHzto2GHzwithouttheuseof

aninternaldoubler.ThePLLdeliversexcellent

performancewhileconsumingjust70mAfroma

single3.3-Vsupply.

Forapplicationslikedigitalmobileradio(DMR)and

wirelessmicrophones,theLMX2572LPsupportsFSK

modulation.DiscretelevelFSKandpulse-shaping

FSKaresupported.DirectdigitalFSKmodulationis

achievablethroughprogrammingorpins.

TheLMX2572LPallowsuserstosynchronizethe

outputofmultipledevicesandalsoenables

applicationsthatneeddeterministicdelaybetween

inputandoutput.TheLMX2572LPprovidesanoption

toadjustthephasewithfinegranularitytoaccountfor

delaymismatchontheboardorwithindevices.A

frequencyrampgeneratorcansynthesizeuptotwo

segmentsoframpinanautomaticrampgeneration

optionoramanualoptionformaximumflexibility.The

fastcalibrationalgorithmallowstheusertochange

frequenciesfasterthan20µs.

TheLMX2572LPintegratesLDOsfromasingle3.3-V

supply,thuseliminatingtheneedforonboardlow-

noiseLDOs.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LMX2572LPVQFN(40)6.00mm×6.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

FunctionalBlockDiagram

Produktspecifikationer