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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

MUX AMUX B

Pre-R

Divider

Post-R

Divider

Enable

Phase

Sync

û

Modulator

N-Divider

SYSREF

LDOs

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LMX2572

SNAS740B–OCTOBER2017–REVISEDJANUARY2019

LMX25726.4-GHzLowpowerwidebandRFsynthesizerwithphasesynchronizationand

JESD204Bsupport

1

1Features

1

•Outputfrequency:12.5MHzto6.4GHz

•Lowpowerconsumption:75mAat3.3-Vsupply

•–106-dBc/HzPhasenoiseat100-kHzoffsetwith

6.4-GHzcarrier

•PLLfigureofmerit:–232dBc/Hz

•PLLnormalized1/fnoise:–123.5dBc/Hz

•32-BitFractional-Ndivider

•Removeintegerboundaryspurswith

programmableinputmultiplier

•Synchronizationofoutputphaseacrossmultiple

devices

•SupportforJESD204BSYSREFwith

programmabledelay

•Supportforrampandchirpfunctions

•SupportforFSKdirectdigitalmodulation

•Twoprogrammableoutputpowerleveldifferential

outputs

•FastVCOcalibrationspeed:<20µs

•Single3-Vto3.5-Vpowersupply

2Applications

•Testandmeasurementequipment

•Digital2-wayradios

•Lowpowerradiocommunicationsystems

•Satellitecommunication

•Wirelessmicrophones

•Proprietywirelessconnectivity

•MIMO

•RADAR

•High-speeddataconverterclocking

3Description

TheLMX2572isalow-power,high-performance

widebandsynthesizerthatcangenerateany

frequencyfrom12.5MHzto6.4GHzwithoutusingan

internaldoubler.ThePLLdeliversexcellent

performancewhileconsumingjust75mAfroma

single3.3-Vsupply.

Forapplicationslikedigitalmobileradio(DMR)and

wirelessmicrophones,theLMX2572supportsFSK

modulation.DiscretelevelFSKandpulse-shaping

FSKaresupported.DirectdigitalFSKmodulationis

achievablethroughprogrammingorpins.

TheLMX2572allowsuserstosynchronizetheoutput

ofmultipledevicesandalsoenablesapplicationsthat

needdeterministicdelaybetweeninputandoutput.

TheLMX2572providesanoptiontoadjustthephase

withfinegranularitytoaccountfordelaymismatchon

theboardorwithindevices.Afrequencyramp

generatorcansynthesizeuptotwosegmentsoframp

inanautomaticrampgenerationoptionoramanual

optionformaximumflexibility.Thefastcalibration

algorithmallowstheusertochangefrequencies

fasterthan20µs.TheLMX2572alsosupports

generatingorrepeatingSYSREF(compliantto

JESD204Bstandard)makingitanideallow-power,

low-noiseclocksourceforclockinghigh-speeddata

converters.Finedelayadjustmentisprovidedinthis

configurationtoaccountfordelaydifferencesofboard

traces.

TheLMX2572integratesLDOsfromasingle3.3-V

supply,thuseliminatingtheneedforonboardlow-

noiseLDOs.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LMX2572VQFN(40)6.00mm×6.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

FunctionalBlockDiagram

Produktspecifikationer