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Fast

lock

Int. charge

pump

5V charge

pump

R-divider

Phase

detector

µWIRE

Prescaler

N-divider

Output

divider

Output

divider

G4

modulator

Transmit / Receive

To receive mixer

FinCPoutExtFLout

XO

SPICEFSK

OP

MUX

TrCtl

VCO

MUX

CP

MUX

Vcc3p3

VccIO

Lock

dect

MUXout

5V CP

supply

100pF

To driver amplifier

0.1µF

3.3V

0.1µF

3.3V/5V

SoC / DSP

100pF

Enable

0.1µF

2.2µF

VrefVCO

VregVCO

LMX2571

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AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

LMX2571

SNAS654A–MARCH2015–REVISEDJULY2016

LMX2571Low-Power,High-PerformancePLLatinum™RFSynthesizer

withFSKModulation

1

1Features

1

•AnyFrequencyfrom10MHzto1344MHz

•LowPhaseNoiseandSpurs

––123dBc/Hzat12.5kHzOffsetat480MHz

––145dBc/Hzat1MHzOffsetat480MHz

–NormalizedPLLNoiseFloorof–231dBc/Hz

–SpuriousBetterThan–75dBc/Hz

•NewFastLocktoReduceLockTime

•ANovelTechniquetoRemoveIntegerBoundary

Spurs

•Integrated5-VChargePumpandOutputDivider

forExternalVCOOperation

•2-,4-and8-LevelorArbitraryLevelDirectDigital

FSKModulation

•OneTX/RXOutputorTwoFanoutOutputs

•Crystal,XOorDifferentialReferenceClockInput

•LowCurrentConsumption

–39-mATypicalSynthesizerMode(Internal

VCO)

–9-mATypicalPLLMode(ExternalVCO)

•24-BitFractional-NDeltaSigmaModulator

2Applications

•DuplexModeDigitalProfessional2-WayRadio

–dPMR,DMR,PDT,P25PhaseI

•LowPowerRadioCommunicationSystems

–SatcomModem

–WirelessMicrophone

–ProprietyWirelessConnectivity

•HandheldTestandMeasurementEquipment

3Description

TheLMX2571isalow-power,high-performance,

widebandPLLatinum™RFsynthesizerthat

integratesadelta-sigmafractionalNPLL,multiple

corevoltage-controlledoscillator(VCO),

programmableoutputdividersandtwooutputbuffers.

TheVCOcoresworkupto5.376GHzresultingin

continuousoutputfrequencyrangeof10MHzto

1344MHz.

Thissynthesizercanalsobeusedwithanexternal

VCO.Tothatend,adedicated5-Vchargepumpand

anoutputdividerareavailableforthisconfiguration.

Auniqueprogrammablemultiplierisalso

incorporatedtohelpimprovespurs,allowingthe

systemtouseeverychannelevenifitfallsonan

integerboundary.

TheoutputhasanintegratedSPDTswitchthatcan

beusedasatransmit/receiveswitchinFDDradio

application.Bothoutputscanalsobeturnedonto

provide2outputsatthesametime.

TheLMX2571supportsdirectdigitalFSKmodulation

throughprogrammingorpins.DiscretelevelFSK,

pulseshapingFSK,andanalogFMmodulationare

supported.

AnewFastLocktechniquecanbeusedallowingthe

usertostepfromonefrequencytothenextinless

than1.5msevenwhenanexternalVCOisusedwith

anarrowbandloopfilter.

DeviceInformation

(1)

PARTNUMBERPACKAGEBODYSIZE(NOM)

LMX2571WQFN(36)6.00mm×6.00mm

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SimplifiedSchematic

Produktspecifikationer