Texas Instruments LMX2541 Handleiding

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PLL

LMK04000

(Clock Jitter Cleaner)

Clean

Reference

Clock

Ultra-Clean

Local Oscillator

LMX2541

(RF Synthesizer)

PLL

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LMX2541

SNOSB31J–JULY2009–REVISEDDECEMBER2014

LMX2541Ultra-LowNoisePLLatinumFrequencySynthesizerWithIntegratedVCO

1Features3Description

TheLMX2541deviceisanultralow-noisefrequency

1

•MultipleFrequencyOptionsAvailable

synthesizerwhichintegratesahigh-performance

(SeeDeviceComparisonTable)

delta-sigmafractionalNPLL,aVCOwithfully

•FrequenciesFrom31.6MHzto4000MHz

integratedtankcircuit,andanoptionalfrequency

•VeryLowRMSNoiseandSpurs

divider.ThePLLoffersanunprecedentednormalized

noisefloorof–225dBc/Hzandcanbeoperatedwith

•–225dBc/HzNormalizedPLLPhaseNoise

upto104MHzofphase-detectorrate(comparison

•IntegratedRMSNoise(100Hzto20MHz)

frequency)inbothintegerandfractionalmodes.The

–2mRad(100Hzto20MHz)at2.1GHz

PLLcanalsobeconfiguredtoworkwithanexternal

VCO.

–3.5mRad(100Hzto20MHz)at3.5GHz

•UltraLow-NoiseIntegratedVCO

TheLMX2541integratesseverallow-noise,high-

precisionLDOsandoutputdrivermatchingnetworkto

•ExternalVCOOption(InternalVCOBypassed)

providehighersupplynoiseimmunityandmore

•VCOFrequencyDivider1to63(AllValues)

consistentperformance,whilereducingthenumberof

•ProgrammableOutputPower

externalcomponents.Whencombinedwithahigh-

qualityreferenceoscillator,theLMX2541generatesa

•Upto104-MHzPhaseDetectorFrequency

verystable,ultralow-noisesignal.

•IntegratedLow-NoiseLDOs

TheLMX2541isofferedinafamilyof6deviceswith

•ProgrammableChargePumpOutput

varyingVCOfrequencyrangefrom1990MHzupto4

•PartiallyIntegratedLoopFilter

GHz.Usingaflexibledivider,theLMX2541can

•DigitalFrequencyShiftKeying(FSK)Modulation

generatefrequenciesaslowas31.6MHz.

Pin

TheLMX2541isamonolithicintegratedcircuit,

•IntegratedReferenceCrystalOscillatorCircuit

fabricatedinaproprietaryBiCMOSprocess.Device

•HardwareandSoftwarePowerDown

programmingisfacilitatedusingathree-wire

MICROWIREinterfacethatcanoperatedownto1.6

•FastLockModeandVCO-BasedCycleSlip

volts.Supplyvoltagerangesfrom3.15Vto3.45V.

Reduction

TheLMX2541isavailableina36-pin6-mm×6-mm

•AnalogandDigitalLockDetect

×0.8-mmWQFNpackage.

•1.6-VLogicCompatibility

DeviceInformation

(1)

2Applications

VCOFREQUENCY

PARTNUMBERPACKAGE

(MHz)

•WirelessInfrastructure(UMTS,LTE,WiMax)

LMX2541SQ2060EWQFN(36)1990-2240

•BroadbandWireless

LMX2541SQ2380EWQFN(36)2200-2530

•WirelessMeterReading

LMX2541SQ2690EWQFN(36)2490-2865

•TestandMeasurement

LMX2541SQ3030EWQFN(36)2810-3230

•FMMobileRadio

LMX2541SQ3320EWQFN(36)3130-3600

space

LMX2541SQ3740EWQFN(36)3480-4000

(1)Forallavailablepackages,seetheorderableaddendumat

theendofthedatasheet.

SystemBlockDiagram

1

AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,

intellectualpropertymattersandotherimportantdisclaimers.PRODUCTIONDATA.

Product specificaties