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VddRF5

Phase

Comp

FinIF

Charge

Pump

CPoutIF

Ftest/LD

MUX

Ftest/LD

IF

LD

Phase

Comp

8/9

or

16/17

Prescaler

B Counter

IF N Divider

A Counter

FLoutRF

VddIF2

VddIF1

RFN Divider

GND

GND

GND

FinRF

FinRF*

16/17/20/21

or

32/33/36/37

Prescaler

C Counter

6'

Compensation

A Counter

B Counter

RF N Divider

ENOSC

OSCout

OSCin

VddRF4

VddRF3

VddRF2

VddRF1

IF R

Divider

RF R

Divider

1X / 2X

RF LD

Charge

Pump

CPoutRF

RF Fastlock

MICROWIRE

Interface

CLK

LE

DATA

CE

Product

Folder

Sample &

Buy

Technical

Documents

Tools &

Software

Support &

Community

LMX2486

SNAS324B–JANUARY2006–REVISEDJANUARY2016

LMX24861-GHzto4.5-GHzHigh-PerformanceDelta-SigmaLow-PowerDualPLLatinum™

FrequencySynthesizersWith3-GHzIntegerPLL

1

1Features

•QuadrupleModulusPrescalerforLowerDivids3Description

TheLMX2486deviceisalow-power,high

–RFPLL:16/17/20/21or32/33/36/37

performancedelta-sigmafractional-NPLLwithan

–IFPLL:8/9or16/17

auxiliaryinteger-NPLL.Thedeviceisfabricated

•AdvancedDeltaSigmaFractionalCompensation

usingTI’sadvancedprocess.

–12-Bitor22-BitSelectableFractionalModulus

Withdelta-sigmaarchitecture,fractionalspursat

–Upto4thOrderProgrammableDelta-Sigma

loweroffsetfrequenciesarepushedtohigher

Modulator

frequenciesoutsidetheloopbandwidth.Theabilityto

pushcloseinspurandphasenoiseenergytohigher

•ImprovedLockTimesandProgramming

frequenciesisadirectfunctionofthemodulator

–Fastlock/CycleSlipReductionWhich

order.Unlikeanalogcompensation,thedigital

RequiresOnlyaSingle-WordWrite

feedbacktechniqueusedintheLMX2486ishighly

–IntegratedTime-OutCounter

resistanttochangesintemperatureandvariationsin

waferprocessing.TheLMX2486delta-sigma

•WideOperatingRange

modulatorisprogrammableuptofourthorder,which

–LMX2486RFPLL:1.0GHzto4.5GHz

allowsthedesignertoselecttheoptimummodulator

•UsefulFeatures

ordertofitthephasenoise,spur,andlocktime

requirementsofthesystem.

–DigitalLockDetectOutput

–HardwareandSoftwarePower-DownControl

SerialdataforprogrammingtheLMX2486is

transferredthroughathree-line,high-speed(20-MHz)

–On-ChipCrystalReferenceFrequencyDoubler

MICROWIREinterface.TheLMX2486offersfine

–RFPhaseDetectorFrequencyUpto50MHz

frequencyresolution,lowspurs,fastprogramming

–2.5-Vto3.6-VOperationWithI

CC

=8.5mA

speed,andasingle-wordwritetochangethe

frequency.Thismakesitidealfordirectdigital

2Applications

modulationapplications,wheretheN-counteris

directlymodulatedwithinformation.TheLMX2486is

•CellularPhonesandBaseStations

availableina24-lead4.0×4.0×0.8mmWQFN

•DirectDigitalModulationApplications

package.

•SatelliteandCableTVTuners

DeviceInformation

(1)

•WLANStandards

PARTNUMBERPACKAGEBODYSIZE(NOM)

LMX2486WQFN(24)4.00mm×4.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

FunctionalBlockDiagram

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Produktspecifikationer