www.德州仪器.com
CDCM7005
SCAS793A–JUNE2005–REVISEDJUNE2005
devicecharacteristics(持续)
overrecommendedoperatingfree-airtemperaturerange(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYP
(1)
MAXUNIT
lvcmosinputcurrentforpd,重置,
I
IH
支撑,ref_sel,pri_ref,v
I
=V
CC
,v
CC
=3.6v5µa
秒_ref,(看
(4)
)
lvcmosinputcurrentforpd,重置,
I
IL
支撑,ref_sel,pri_ref,v
I
=0v,v
CC
=3.6v–15–35µa
秒_ref,(看
(4)
)
V
CC
=mintomax,
V
CC
–0.1
I
OH
=–100
µ
一个
高-leveloutputvoltageforlvcmos
V
OH
V
outputsV
CC
=3v,i
OH
=–6ma2.4
V
CC
=3v,i
OH
=–12mA2
V
CC
=mintomax,
0.1
I
OL
=100
µ
一个
低-leveloutputvoltageforlvcmos
V
OL
V
outputsV
CC
=3v,i
OL
=6ma0.5
V
CC
=3v,i
OL
=12ma0.8
I
OH
高-leveloutputcurrentv
CC
=3.3v,v
O
=1.65v–30ma
I
OL
低-leveloutputcurrentv
CC
=3.3v,v
O
=1.65v33ma
vref_在=v
CC
/2,y=v
CC
/2,
tphophaseoffset(ref_intoyoutput)
(5)
1.8ns
看Figure11,加载=10pf
t
sk(p)
lvcmospulseskew,看Figure10CrosspointtoV
CC
/2load,看Figure12150ps
t
pd(lh)
CrosspointtoV
CC
/2,
propagationdelayfromvcxo_在
加载=10pf,看Figure12(pll22.53ns
yx,看Figure10
t
pd(hl)
bypassmode)
Alloutputshavethesamedividerratio55
lvcmossingle-endedoutputskew,
t
sk(o)
ps
看
(6)
和Figure10
Outputshavedifferentdividerratios70
DutycycleLVCMOSV
CC
/2tov
CC
/249%51%
20%to80%ofswing(加载
t
回转-比率
outputrise/fallslewrate2.43.5v/ns
看Figure12)
LVPECL
f
clk
outputfrequency,看
(7)
和Figure5加载,看Figure1301500MHz
I
I
LVPECLinputcurrentV
I
=0VorV
CC
±
20µA
V
OH
lvpeclhigh-leveloutputvoltageload,看Figure13V
CC
–1.18v
CC
–0.81v
V
OL
lvpecllow-leveloutputvoltageload,看Figure13V
CC
–2V
CC
–1.55v
|V
OD
|DifferentialoutputvoltageSeeFigure9andload,看Figure13500mV
vref_在=v
CC
/2tocrosspointofy,
t
pho
phaseoffset(ref_intoyoutput)
(6)
–200100ps
看Figure11
t
pd(lh)
propagationdelaytime,vcxo_intocrosspoint-至-crosspoint,加载
340490640ps
yx,看Figure10看Figure13
t
pd(hl)
crosspoint-至-crosspoint,加载
t
sk(p)
lvpeclpulseskew,看Figure1010ps
看Figure13
LoadseeFigure13,alloutputshavethe
20
samedividerratio
t
sk(o)
LVPECLoutputskew
(6)
ps
LoadseeFigure13,outputshave
50
differentdividerratios
t
r
/t
f
Riseandfalltime20%to80%ofV
OUTPP
,看Figure9120170220ps
inputcapacitanceatvcxo_在,
C
I
1.5pf
vcxo_在
lvcmos-至-lvpecl
OutputskewbetweenLVCMOSandCrosspointtoV
CC
/2;加载,
t
sk(p_c)
1.722.4ns
lvpecloutputs,看
(8)
和Figure10看Figure12和Figure13
(4)theseinputshaveaninternal150-k
Ω
pullupresistor.
(5)thisisvalidonlyforthesamefrequencyofref_inclockandyoutputclock.itcanbeadjustedbythespicontroller(referencedelaym
andvcxodelayn).
(6)thet
sk(o)
specificationisonlyvalidforequalloadingofalloutputs.
(7)operatingthelvcmosorlvpecloutputabovethemaximumfrequencywillnotcauseamalfunctiontothedevice,buttheoutput
signalswingmaynolongermeettheoutputspecification.
(8)thephaseoflvcmosislagginginreferencetothephaseoflvpecl.
8
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