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1GeneralDescription
User'sGuide
SCAU020–March2007
10.9MHz–1175MHzLowPhaseNoiseClockEvaluation
Board
Figure1.CDCE421EVMEvaluationBoard
Features:
•Easy-to-useevaluationmodulegenerateslowphasenoiseclocksbetween
10.9MHz—1175MHz
•Simpledeviceprogrammingviahost-poweredUSBport
•FastconfigurationthroughprovidedsoftwareGUI
•TotalboardpowerprovidedeitherthroughUSBportorseparate3.3Vandground
connections
•LVCMOSinputinterfaceorcrystalinput
•Standard6-pinXOpackageconnectionavailable(forCDCE421-enabledXO
devices)
TheCDCE421isahigh-performance,lowphasenoiseclockgenerator.Ithastwofullyintegrated,
low-noise,liquidcrystal(LC)-basedvoltage-controlledoscillators(VCOs)thatoperateinthe
1.75GHz–2.35GHzrange.
TheCDCE421hasanintegratedcrystaloscillatorcircuitrythatoperatesinconjunctionwithanexternal
AT-cutcrystaltoproduceastablefrequencyreferenceforthePLL-basedfrequencysynthesizer.A3.3V
LVCMOSlevelinputcanalsobeusedinsteadofacrystaltoprovideaPLLfrequencyreference.
Theevaluationmodule(EVM)isdesignedtoquicklydemonstratetheelectricalperformanceofthedevice.
Thisfullyassembledandfactory-testedEVMallowscompletevalidationofalldevicefunctionsforavariety
ofapplications.Throughoutthisdocument,theacronymEVMandthephrasesevaluationmoduleand
evaluationboardaresynonymouswiththeCDCE421EVM.Figure1illustratestheCDCE421EVM.
Foroptimumperformance,theboardisequippedwith50ΩSMAconnectorsandwell-controlled50Ω
impedancemicrostriptransmissionlines.
Windows,WindowsXPareregisteredtrademarksofMicrosoftCorporation.
Allothertrademarksarethepropertyoftheirrespectiveowners.
SCAU020–March200710.9MHz–1175MHzLowPhaseNoiseClockEvaluationBoard5
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