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Vcc (x5)

GND (x3)

Fin

Fin*

OSCin

R Divider

(16 bit)

Charge

Pump

CPout

MICROWIRE

Interface

CLK

LE

DATA

CE

GND/OSCin*

2X

Vcp

MUX

MUXout

MOD

TRIG1

TRIG2

Modulation

Generator

N Divider

(18 bit)

û

Compensation

(24 bit)

18 Ÿ

68 Ÿ

R2_LF

C2_LF

C1_LF

51 Ÿ

51 Ÿ

36 Ÿ

Phase

Comp

51 Ÿ

18 Ÿ

18 Ÿ

To Circuit

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LMX2491

SNAS711A–OCTOBER2016–REVISEDJANUARY2017

LMX24916.4-GHzLowNoiseRFPLLWithRamp/ChirpGeneration

1

1Features

1

•–227-dBc/HzNormalizedPLLNoise

•500-MHzto6.4-GHzWidebandPLL

•3.15-Vto5.25-VChargePumpPLLSupply

•VersatileRamp/ChirpGeneration

•200-MHzMaximumPhaseDetectorFrequency

•FSK/PSKModulationPin

•DigitalLockDetect

•Single3.3-VSupplyCapability

2Applications

•FMCWRadars

•MilitaryRadars

•MicrowaveBackhaul

•TestandMeasurement

•SatelliteCommunications

•WirelessInfrastructure

•SamplingClockforHigh-SpeedADC/DAC

3Description

TheLMX2491deviceisalow-noise,6.4-GHz

widebanddelta-sigmafractionalNPLLwithrampand

chirpgeneration.Itconsistsofaphasefrequency

detector,programmablechargepump,andhigh

frequencyinputfortheexternalVCO.TheLMX2491

supportsabroadandflexibleclassoframping

capabilities,includingFSK,PSK,andconfigurable

piecewiselinearFMmodulationprofilesofupto8

segments.ItsupportsfinePLLresolutionandfast

rampwithuptoa200-MHzphasedetectorrate.The

LMX2491allowsanyofitsregisterstobereadback.

TheLMX2491canoperatewithasingle3.3-Vsupply.

Moreover,supportingupto5.25-Vchargepumpcan

eliminatetheneedofexternalamplifier,leadingtoa

simplersolutionwithimprovedphasenoise

performance.

DeviceInformation

PARTNUMBERPACKAGEBODYSIZE(NOM)

LMX2491WQFN(24)4.00mm×4.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

Produktspecifikationer