www.德州仪器.com
ADS8504
SLAS434–JUNE2005
electricalcharacteristics(持续)
T
一个
=-40°cto85°c,f
s
=250khz,v
DIG
=V
ANA
=5v,usinginternalreference(unlessotherwisenoted)
PARAMETERTESTCONDITIONSMINTYPMAXUNIT
全部-scaleerror
(3)(4)
ext.2.5-vref.-0.250.25%fsr
全部-scaleerrordriftext.2.5-vref.±2ppm/°c
Bipolarzeroerror
(3)
-11lsb
bipolarzeroerrordrift±0.4ppm/°c
powersupplysensitivity-0.50.5
+4.75v<v
D
<+5.25vlsb
(v
DIG
=V
ANA
=V
D
)
ACACCURACY
sfdrspurious-freedynamicrangef
I
=45kHz8694dB
(5)
THDTotalharmonicdistortionf
I
=45khz-95-86db
f
I
=45kHz7273dB
sinadsignal-至-(noise+distortion)
–60-dbinput32db
snrsignal-至-noiseratiof
I
=45kHz7273dB
全部-powerbandwidth
(6)
500kHz
SAMPLINGDYNAMICS
Aperturedelay5ns
TransientresponseFSStep2µs
Overvoltagerecovery
(7)
150ns
涉及
internalreferencevoltage2.482.52.52v
internalreferencesourcecurrent(mustuse
1µA
externalbuffer)
internalreferencedrift8ppm/°c
Externalreferencevoltagerangeforspecified
2.32.52.7v
线性
externalreferencecurrentdrainext.2.5-vref.100µa
DIGITALINPUTS
Logiclevels
V
IL
低-levelinputvoltage-0.30.8v
V
IH
高-levelinputvoltage2.0v
DIG
+0.3vv
I
IL
低-levelinputcurrent±10µa
I
IH
高-levelinputcurrent±10µa
DIGITALOUTPUTS
dataformat(parallel12-位)
datacoding(binary2'scomplement)
V
OL
低-leveloutputvoltagei
下沉
=1.6ma0.4v
V
OH
高-leveloutputvoltagei
源
=500µA4V
leakagecurrenthi-zstate,v
输出
=0VtoV
DIG
±5µA
outputcapacitancehi-zstate15pf
DIGITALTIMING
Busaccesstiming83ns
Busrelinquishtiming83ns
(5)allspecificationsindbarereferredtoafull-scale±10-vinput.
(6)全部-powerbandwidthisdefinedasthefull-scaleinputfrequencyatwhichsignal-至-(noise+distortion)degradesto60db,or10bitsof
精度.
(7)recoverstospecifiedperformanceafter2xfsinputovervoltage.
3
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