Texas Instruments CDC421A125 Bedienungsanleitung

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FEATURESAPPLICATIONS

DESCRIPTION

Crystal

Oscillator

Input

Feedback

Divider

PFD/ChargePump

LoopFilter

VCO

Prescaler

OutputDivider

LVPECL

External

Crystal

CLK

NCLK

CDC421AXXX

www.ti.com

.......................................................................................................................................................................................................SCAS875–MAY2009

Fully-Integrated,Fixed-Frequency,Low-Jitter

CrystalOscillatorClockGenerator

•Low-Cost,Low-JitterFrequencyMultiplier

2

•Single3.3-VSupply

•High-PerformanceClockGenerator,

IncorporatingCrystalOscillatorCircuitrywith

IntegratedFrequencySynthesizer

TheCDC421Axxxisahigh-performance,

low-phase-noiseclockgenerator.Ithasanintegrated

•LowOutputJitter:Aslowas380fs(RMS

low-noise,LC-basedvoltage-controlledoscillator

integratedbetween10kHzto20MHz)

(VCO)thatoperateswithinthe1.75GHzto2.35GHz

•LowPhaseNoiseat312.5MHz:

frequencyrange.Ithasanintegratedcrystaloscillator

–Lessthan–120dBc/Hzat10kHzand

thatoperatesinconjunctionwithanexternalAT-cut

–147dBc/Hzat10-MHzoffsetfromcarrier

crystaltoproduceastablefrequencyreferencefora

phase-lockedloop(PLL)-basedfrequency

•SupportsCrystalorLVCMOSInput

synthesizer.Theoutputfrequency(f

OUT

)is

Frequenciesat31.25MHz,33.33MHz,and

proportionaltothefrequencyoftheinputcrystal

35.42MHz

(f

XTAL

).

•OutputFrequencies:100MHz,106.25MHz,

Thedeviceoperatesin3.3-Vsupplyenvironmentand

125MHz,156.25MHz,212.5MHz,250MHz,and

ischaracterizedforoperationfrom–40°Cto+85°C.

312.5MHz

TheCDC421AxxxisavailableinaQFN-244-mm×

•DifferentialLow-VoltagePositiveEmitter

4-mmpackage.

CoupledLogic(LVPECL)Outputs

TheCDC421AxxxdiffersfromtheCDC421xxxin

•Fully-IntegratedVoltage-ControlledOscillator

thefollowingways:

(VCO):Runsfrom1.75GHzto2.35GHz

•DeviceStartup

•TypicalPowerConsumption:300mW

TheCDC421Axxxhasanimprovedstartupcircuit

•ChipEnableControlPin

toenablecorrectoperationforallpower-supply

ramptimes.

•Availablein4-mm×4-mmQFN-24Package

•ESDProtectionExceeds2kV(HBM)

•IndustrialTemperatureRange:–40°Cto+85°C

CDC421Axxx

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsofTexas

Instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

2Alltrademarksarethepropertyoftheirrespectiveowners.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2009,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

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