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ADS7887SPECIFICATIONS
ADS7887
ADS7888
SLAS468–JUNE2005
+V
DD
=2.35vto5.25v,t
一个
=–40
°
Cto125
°
c,f
样本
=1.25mhz
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
ANALOGINPUT
全部-scaleinputvoltagespan
(1)
0V
DD
V
absoluteinputvoltagerange+in–0.20v
DD
+0.20v
C
i
Inputcapacitance
(2)
21pF
I
Ilkg
InputleakagecurrentT
一个
=125
°
C40nA
SYSTEMPERFORMANCE
Resolution10Bits
Nomissingcodes10Bits
inlintegralnonlinearity–0.75
±
0.350.75lsb
(3)
dnldifferentialnonlinearity–0.5
±
0.350.5lsb
E
O
Offseterror
(4)(5)(6)
–1.5
±
0.51.5lsb
E
G
Gainerror
(5)
–1
±
0.51lsb
SAMPLINGDYNAMICS
conversiontime25-mhzsclk530560ns
Acquisitiontime260ns
maximumthroughputrate25-mhzsclk1.25mhz
Aperturedelay5ns
StepResponse160ns
Overvoltagerecovery160ns
DYNAMICCHARACTERISTICS
THDTotalharmonicdistortion
(7)
100kHz–84–72dB
sinadsignal-至-noiseanddistortion100khz60.561db
SFDRSpuriousfreedynamicrange100kHz7381dB
FullpowerbandwidthAt–3dB15MHz
digitalinput/输出
Logicfamily—CMOS
vdd=2.35vto5.25vv
DD
–5.25
V
IH
高-levelinputvoltagev
0.4
V
DD
=5v0.8
V
IL
低-levelinputvoltagev
V
DD
=3v0.4
V
OH
高-leveloutputvoltageati
源
=200µAV
DD
–0.2
V
V
OL
低-leveloutputvoltageati
下沉
=200µa0.4
POWERSUPPLYREQUIREMENTS
+V
DD
supplyvoltage2.353.35.25v
AtV
DD
=2.35vto5.25v,1.25-mhzthroughput2
supplycurrent(normalmode)毫安
AtV
DD
=2.35vto5.25v,staticstate1.5
SCLKoff1
PowerdownstatesupplycurrentµA
sclkon(25mhz)200
V
DD
=5V810
powerdissipationat1.25mhz
mW
throughput
V
DD
=3v3.86
(1)idealinputspan;doesnotincludegainoroffseterror.
(2)谈及Figure36fordetailsonsamplingcircuit
(3)lsbmeansleastsignificantbit
(4)measuredrelativetoanidealfull-scaleinput
(5)offseterrorandgainerrorensuredbycharacterization.
(6)firsttransitionof000hto001hat0.5×(v
ref
/2
10
)
(7)calculatedonthefirstnineharmonicsoftheinputfrequency
4
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