www.德州仪器.com
描述
CDCM7005
SCAS793A–JUNE2005–REVISEDJUNE2005
thecdcm7005isahigh-效能,lowphasenoiseandlowskewclocksynchronizerthatsynchronizesa
vcxo(voltagecontrolledcrystaloscillator)orvco(voltagecontrolledoscillator)frequencytooneofthetwo
referenceclocks.theprogrammablepre-dividermandthefeedback-dividersnandpgiveahighflexibilitytothe
frequencyratioofthereferenceclocktovc(x)o:
•
vc(x)o_在/pri_ref=(nxp)/mor
•
vc(x)o_在/秒_ref=(nxp)/m
vc(x)o_inclockoperatesupto2.2ghz.throughtheselectionofexternalvc(x)oandloopfiltercomponents,
thepllloopbandwidthanddampingfactorcanbeadjusttomeetdifferentsystemrequirements.
thecdcm7005canlocktooneoftworeferenceclockinputs(pri_refandsec_ref),supportsfrequency
支撑-overmodeandfast-频率-lockingforfail-safeandincreasedsystemredundancy.theoutputsofthe
CDCM7005areuserdefinableandcanbeanycombinationofuptofiveLVPECLoutputsorupto10LVCMOS
输出.thelvcmosoutputsarearrangedinpairs(y0a:y0b,y1a:y1b,
…
),sothateachpairhasthesame
频率.buteachoutputcanbeseparatelyinvertedanddisabled.thebuiltinsynchronizationlatchesensure
thatalloutputsaresynchronizedforlowoutputskew.
alldevicesettings,likeoutputssignaling,dividervalue,inputselection,andmanymore,areprogrammableby
spi(3-wireserialperipheralinterface).spiallowsindividuallycontrolofthedevicesettings.
thedeviceoperatesin3.3-venvironmentandischaracterizedforoperationfrom–40
°
Cto85
°
c.
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