Texas Instruments LMX2487 Handleiding

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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

LMX2487

SNAS322C–FEBRUARY2006–REVISEDJANUARY2016

LMX24871-GHzto6-GHzHighPerformanceDelta-SigmaLow-PowerDualPLLatinum™

FrequencySynthesizersWith3-GHzIntegerPLL

1Features3Description

TheLMX2487deviceisalowpower,high

1

•QuadrupleModulusPrescalerforLowerDivides

performancedelta-sigmafractional-NPLLwithan

–RFPLL:16/17/20/21or32/33/36/37

auxiliaryinteger-NPLL.ItisfabricatedusingTI’s

–IFPLL:8/9or16/17

advancedprocess.

•AdvancedDeltaSigmaFractionalCompensation

Withdelta-sigmaarchitecture,fractionalspursat

–12-Bitor22-BitSelectableFractionalModulus

loweroffsetfrequenciesarepushedtohigher

frequenciesoutsidetheloopbandwidth.Theabilityto

–Upto4thOrderProgrammableDelta-Sigma

pushcloseinspurandphasenoiseenergytohigher

Modulator

frequenciesisadirectfunctionofthemodulator

•ImprovedLockTimes

order.Unlikeanalogcompensation,thedigital

–Fastlock/CycleSlipReductionWithSingle-

feedbacktechniqueusedintheLMX2487ishighly

resistanttochangesintemperatureandvariationsin

WordWritetoChangeFrequencies

waferprocessing.TheLMX2487delta-sigma

–IntegratedTime-OutCounter

modulatorisprogrammableuptofourthorder,which

•WideOperatingRange

allowsthedesignertoselecttheoptimummodulator

–LMX2487RFPLL:1.0GHzto6.0GHz

ordertofitthephasenoise,spur,andlocktime

requirementsofthesystem.

•UsefulFeatures

SerialdataforprogrammingtheLMX2487is

–DigitalLockDetectOutput

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

–HardwareandSoftwarePower-DownControl

MICROWIREinterface.TheLMX2487offersfine

–On-ChipInputFrequencyDoubler

frequencyresolution,lowspurs,fastprogramming

–RFPhaseComparisonDetectorUpto50MHz

speed,andasingle-wordwritetochangethe

frequency.Thismakesitidealfordirectdigital

–2.5-Vto3.6-VOperationWithI

CC

=8.5mA

modulationapplications,wheretheN-counteris

directlymodulatedwithinformation.TheLMX2487is

2Applications

availableina24-lead4.0×4.0×0.8mmWQFN

•CellularPhonesandBaseStations

package.

•DirectDigitalModulationApplications

DeviceInformation

(1)

•SatelliteandCableTVTuners

PARTNUMBERPACKAGEBODYSIZE(NOM)

•WLANStandards

LMX2487WQFN(24)4.00mm×4.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

FunctionalBlockDiagram

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties