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1、BurrĆBrownProductsfromTexasInstrumentsADS7884ADS7885SLAS567–MARCH200810-/8-BIT,3-MSPS,MICRO-POWER,MINIATURESARANALOG-TO-DIGITALCONVERTERS1FEATURESAPPLICATIONS·3-MHzSampleRateSerialDevice·BaseBandConvertersinRadioCommunication·10-BitResolution–ADS7884·MotorCurrent/BusVoltageSensors
2、inDigital·8-BitResolution–ADS7885Drives·ZeroLatency·OpticalNetworking(DWDM,MEMSBased·48-MHzSerialInterfaceSwitching)·SupplyRange:2.7Vto5.5V·OpticalSensors·LowPowerDissipation:·BatteryPoweredSystems–6.8mWat3-VVDD,2.5MSPS·MedicalInstrumentations–15mwat5-VVDD,3MSPS·High-SpeedDataAcqu
3、isitionSystems·High-SpeedClosed-LoopSystems·±0.3LSBINL,±0.3LSBDNL–ADS7884·±0.15LSBINL,±0.1LSBDNL–ADS7885·61.7dBSINAD,–81dBTHD–ADS7884·49.8dBSINAD,–68dBTHD–ADS7885·UnipolarInputRange:0VtoVDD·PowerdownCurrent:1µA·WideInputBandwidth:30MHzat3dB·6-PinSOT23PackageDESCRIPTIONTheADS7884is
4、a10-bit,3-MSPSanalog-to-digitalconverter(ADC),andtheADS7885isa8-bit,3-MSPSADC.ThedevicesincludeacapacitorbasedSARA/Dconverterwithinherentsampleandhold.TheserialinterfaceineachdeviceiscontrolledbytheCSandSCLKsignalsforgluelessconnectionswithmicroprocessorsandDSPs.Theinputsignalissa
5、mpledwiththefallingedgeofCS,andSCLKisusedforconversionandserialdataoutput.Thedevicesoperatefromawidesupplyrangefrom2.7Vto5.5V.Thelowpowerconsumptionofthedevicesmakethemsuitableforbattery-poweredapplications.Thedevicesalsoincludeapowersavingpowerdownfeatureforwhenthedevicesareopera
6、tedatlowerconversionspeeds.ThehighlevelofthedigitalinputtothedeviceisnotlimitedtodeviceVDD.Thismeansthedigitalinputcangoashighas5.5Vwhendevicesupplyis2.7V.Thisfeatureisusefulwhendigitalsignalsarecomingfromothercircuitwithdifferentsupplylevels.Alsothisrelaxesrestrictiononpowerupseq
7、uencing.TheADS7884andADS7885areavailableina6-pinSOT23packageandarespecifiedforoperationfrom–40°Cto125°C.Micro-PowerMiniatureSARConverterFamilyBIT<300KSPS300KSPS–1.25MSPS3MSPS12-BitADS7866(1.2VDDto3.6VDD)ADS7886(2.35VDDto5.25VDD)—10-BitADS7867(1.2VDDto3.6VDD)ADS7887(2.35VDDto5.25VD
8、D)ADS7884(2.7VDDto5.5VDD)8-BitADS
