FEATURESAPPLICATIONS
描述
ADS7887
ADS7888
SLAS468–JUNE2005
10-/8-位,1.25-msps,微观的-电源,小型的
saranalog-至-digitalconverters
•
basebandconvertersinradiocommuni-
•
1.25-mhzsamplerateserialdevice
cation
•
10-bitresolution–ads7887
•
motorcurrent/busvoltagesensorsindigital
•
8-bitresolution–ads7888
驱动
•
ZeroLatency
•
opticalnetworking(dwdm,memsbased
•
25-mhzserialinterface
切换)
•
supplyrange:2.35vto5.25v
•
OpticalSensors
•
BatteryPoweredSystems
•
typicalpowerdissipationat1.25msps:
•
MedicalInstrumentations
–3.8mwat3-vv
DD
•
高-speeddataacquisitionsystems
–8mwat5-vv
DD
•
高-speedclosed-loopsystems
•±
0.35lsbinl,dnl–ads7887
•±
0.15lsbinl,
±
0.1lsbdnl–ads7888
•
61dbsinad,-84dbthd–adsa7887
•
49.5dbsinad,-67.5dbthd–ads7888
•
unipolarinputrange:0vtov
DD
•
powerdowncurrent:1µa
•
wideinputbandwidth:15mhzat3db
•
6-pinsot23andsc70packages
theads7887isa10-位,1.25-mspsanalog-至-digitalconverter(模数转换器),andtheads7888isa8-位,1.25-msps
模数转换器.thedevicesincludeacapacitorbasedsara/dconverterwithinherentsampleandhold.theserial
interfaceineachdeviceiscontrolledbytheCSandSCLKsignalsforgluelessconnectionswithmicroprocessors
anddsps.theinputsignalissampledwiththefallingedgeofcs,andsclkisusedforconversionandserial
dataoutput.
thedevicesoperatefromawidesupplyrangefrom2.35vto5.25v.thelowpowerconsumptionofthedevices
makethemsuitableforbattery-poweredapplications.thedevicesalsoincludeapowersavingpowerdown
featureforwhenthedevicesareoperatedatlowerconversionspeeds.
ThehighlevelofthedigitalinputtothedeviceisnotlimitedtodeviceV
DD
.thismeansthedigitalinputcangoas
highas5.25vwhendevicesupplyis2.35v.thisfeatureisusefulwhendigitalsignalsarecomingfromother
circuitwithdifferentsupplylevels.alsothisrelaxesrestrictiononpowerupsequencing.
theads7887andads7888areavailablein6-pinsot23andsc70packagesandarespecifiedforoperation
从-40°cto125°c.
微观的-powerminiaturesarconverterfamily
位<300ksps300ksps–1.25msps
12-bitads7866(1.2v
DD
to3.6v
DD
)ads7886(2.35v
DD
to5.25v
DD
)
10-bitads7867(1.2v
DD
to3.6v
DD
)ads7887(2.35v
DD
to5.25v
DD
)
8-bitads7868(1.2v
DD
to3.6v
DD
)ads7888(2.35v
DD
to5.25v
DD
)
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
productiondatainformationiscurrentasofpublicationdate.
copyright©2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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