www.德州仪器.com
CDCM7005
SCAS793A–JUNE2005–REVISEDJUNE2005
table1.pinassingment
终端
i/odescription
NAMEBGAQFN
d7,e3,2,5,6,
e4,e5,9,10,
e6,e7,13,15,
3.3-vsupply.thereisnointernalconnectionbetweenv
CC
andAV
CC
.itis
vcce8,f7,18,19,电源
recommendedthatAV
CC
useitsownsupplyfilter.
g2,g3,20,21,
g4,g5,41,44,
g6,g745;48
b2,b3,
b4,b5,
b6,b7,
b8,c2,
热的
d2,d3,
GNDpadandGroundGround
d4,d5,
pin24
d6,e2,
f2,f3,
f4,f5,
F6
c3,c4,27,30,
analog3.3-vanalogpowersupply.thereisnointernalconnectionbetweenav
CC
和
avccc5,c6,32,38,
PowerV
CC
.itisrecommendedthatav
CC
useitsownsupplyfilter.
C739
Thisisthechargepumppowersupplypinusedtohavethesamesupplyasthe
vcc_cpa333power
externalvco.itcanbesetfrom2.3vto3.6v.
lvcmosinput,controllatchenableforserialprogrammableinterface(spi),和
ctrl_lea529i
hysteresis
ctrl_clka628ilvcmosinput,serialcontrolclockinputforspi,withhysteresis
ctrl_dataa726ilvcmosinput,serialcontroldatainputforspi,withhysteresis
lvcmosinput,asynchronouspowerdown(pd)信号.thispinislowactiveand
canbeactivatedexternalorbythecorrespondingbitinthespiregister(incaseof
logichigh,thespisettingisvalid).switchesthedeviceintopower-downmode.
pdh11iresetsm-andn-分隔物,3-stateschargepump,状态_ref,或者
pri_秒_clkpin,状态_vcxoori_ref_cppin,pll_lockpin,vbbpin
andallyxoutputs.setsthespiregistertodefaultvalue;hasinternal150-k
Ω
pullupresistor.
thislvcmosinputcanbeprogrammed(spi)toactasholdorreset.重置
isthedefaultfunction.thispinislowactiveandcanbeactivatedexternalorvia
thecorrespondingbitinthespiregister.incaseofreset,thechargepump(cp)
isswitchedto3-stateandallcounters(n,m,p)areresettozero(theinitialdivider
settingsaremaintainedinspiregisters).thelvpecloutputsarestaticlowand
highrespectivelyandthelvcmosoutputsareallloworhighifinverted.重置
RESETor
isnotedgetriggeredandshouldhaveapulsedurationofatleast5ns.
H814I
支撑
incaseofhold,thecpisswitchedinto3-statemodeonly.afterholdis
releasedandwiththenextvalidreferenceclockcyclethechargepumpis
switchedbackintonormaloperation(cpstaysin3-stateaslongasnoreference
clockisvalid).duringhold,thepdividerandalloutputsyxareatnormal
运作.thismodeallowsanexternalcontrolofthefrequencyhold-overmode.
theinputhasaninternal150-k
Ω
pullupresistor.
vcxo_ine143ivcxolvpeclinput
vcxo_ind142icomplementaryvcxolvpeclinput
lvcmosinputfortheprimaryreferenceclock,withaninternal150-k
Ω
pullup
pri_refa136i
resistorandinputhysteresis.
lvcmosinputforthesecondaryreferenceclock,withaninternal150-k
Ω
pullup
秒_refb137i
resistorandinputhysteresis.
lvcmosreferenceclockselectioninput.inthemanualmodetheref_sel
signalselectsoneofthetwoinputclocks:
ref_sela235iref_sel[1]:pri_refisselected;
ref_sel[0]:秒_refisselected;
theinputhasaninternal150-k
Ω
pullupresistor.
cp_outa431ochargepumpoutput
4
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