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timingrequirements(看Figure1和Figure2)
ADS7886
SLAS492–SEPTEMBER2005
AllspecificationstypicalatT
一个
=–40
°
Cto125
°
c,v
DD
=2.35vto5.25v(unlessotherwisespecified).
PARAMETERTESTCONDITIONS
(1)
MINTYPMAXUNIT
V
DD
=3V16
×
t
SCLK
t
conv
ConversiontimeADS7866ns
V
DD
=5V16
×
t
SCLK
V
DD
=3V40
minimumquiettimeneededfrombus3-statetostart
t
q
ns
ofnextconversion
V
DD
=5V40
V
DD
=3V1525
t
d1
delaytime,cslowtofirstdata(0)outns
V
DD
=5V1325
V
DD
=3V10
t
su1
setuptime,cslowtosclklowns
V
DD
=5V10
V
DD
=3V1525
t
d2
delaytime,sclkfallingtosdons
V
DD
=5V1325
V
DD
<3v7
t
h1
holdtime,sclkfallingtodatavalid
(2)
ns
V
DD
>5v5.5
V
DD
=3V1025
t
d3
delaytime,16thsclkfallingedgetosdo3-statens
V
DD
=5V820
V
DD
=3V2540
t
w1
pulseduration,csns
V
DD
=5V2540
V
DD
=3V1730
t
d4
delaytime,cshightosdo3-statens
V
DD
=5V1525
V
DD
=3v0.4
×
t
SCLK
t
wH
pulseduration,sclkhighns
V
DD
=5v0.4
×
t
SCLK
V
DD
=3v0.4
×
t
SCLK
t
wL
pulseduration,sclklowns
V
DD
=5v0.4
×
t
SCLK
V
DD
=3V20
频率,sclkmhz
V
DD
=5V20
delaytime,secondfallingedgeofclockandcstov
DD
=3v-25
t
d5
enterinpowerdown(useminspecnottoaccidentlyns
V
DD
=5v-25
enterinpowerdown)Figure2
delaytime,csand10thfallingedgeofclocktov
DD
=3v2-5
t
d6
enterinpowerdown(usemaxspecnottoaccidentlyns
V
DD
=5v2-5
enterinpowerdown)Figure2
(1)3-vspecificationsapplyfrom2.35vto3.6v,and5-vspecificationsapplyfrom4.75vto5.25v.
(2)with50-pfload.
5