Texas Instruments ADS7885 Handleiding

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FEATURESAPPLICATIONS

DESCRIPTION

ADS7884

ADS7885

SLAS567–MARCH2008

10-/8-BIT,3-MSPS,MICRO-POWER,MINIATURE

SARANALOG-TO-DIGITALCONVERTERS

•BaseBandConvertersinRadio

•3-MHzSampleRateSerialDevice

Communication

•10-BitResolution–ADS7884

•MotorCurrent/BusVoltageSensorsinDigital

•8-BitResolution–ADS7885

Drives

•ZeroLatency

•OpticalNetworking(DWDM,MEMSBased

•48-MHzSerialInterface

Switching)

•SupplyRange:2.7Vto5.5V

•OpticalSensors

•BatteryPoweredSystems

•LowPowerDissipation:

•MedicalInstrumentations

–6.8mWat3-VV

DD

,2.5MSPS

•High-SpeedDataAcquisitionSystems

–15mwat5-VV

DD

,3MSPS

•High-SpeedClosed-LoopSystems

•±0.3LSBINL,±0.3LSBDNL–ADS7884

•±0.15LSBINL,±0.1LSBDNL–ADS7885

•61.7dBSINAD,–81dBTHD–ADS7884

•49.8dBSINAD,–68dBTHD–ADS7885

•UnipolarInputRange:0VtoV

DD

•PowerdownCurrent:1µA

•WideInputBandwidth:30MHzat3dB

•6-PinSOT23Package

TheADS7884isa10-bit,3-MSPSanalog-to-digitalconverter(ADC),andtheADS7885isa8-bit,3-MSPSADC.

ThedevicesincludeacapacitorbasedSARA/Dconverterwithinherentsampleandhold.Theserialinterfacein

eachdeviceiscontrolledbytheCSandSCLKsignalsforgluelessconnectionswithmicroprocessorsandDSPs.

TheinputsignalissampledwiththefallingedgeofCS,andSCLKisusedforconversionandserialdataoutput.

Thedevicesoperatefromawidesupplyrangefrom2.7Vto5.5V.Thelowpowerconsumptionofthedevices

makethemsuitableforbattery-poweredapplications.Thedevicesalsoincludeapowersavingpowerdown

featureforwhenthedevicesareoperatedatlowerconversionspeeds.

ThehighlevelofthedigitalinputtothedeviceisnotlimitedtodeviceV

DD

.Thismeansthedigitalinputcangoas

highas5.5Vwhendevicesupplyis2.7V.Thisfeatureisusefulwhendigitalsignalsarecomingfromother

circuitwithdifferentsupplylevels.Alsothisrelaxesrestrictiononpowerupsequencing.

TheADS7884andADS7885areavailableina6-pinSOT23packageandarespecifiedforoperationfrom–40°C

to125°C.

Micro-PowerMiniatureSARConverterFamily

BIT<300KSPS300KSPS–1.25MSPS3MSPS

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

)ADS7884(2.7V

DD

to5.5V

DD

)

8-BitADS7868(1.2V

DD

to3.6V

DD

)ADS7888(2.35V

DD

to5.25V

DD

)ADS7885(2.7V

DD

to5.5V

DD

)

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Pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsof

TexasInstrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.

PRODUCTIONDATAinformationiscurrentasofpublicationdate.

Copyright©2008,TexasInstrumentsIncorporated

ProductsconformtospecificationsperthetermsoftheTexas

Instrumentsstandardwarranty.Productionprocessingdoesnot

necessarilyincludetestingofallparameters.

Product specificaties