ADS1286A中文资料

ADS1286DESCRIPTIONTheADS1286isa12-bit,20kHzanalog-to-digitalconverterwithadifferentialinputandsampleandholdamplifierandconsumesonly250μAofsupplycur-rent.TheADS1286offersanSPIandSSIcompatibleserialinterfaceforcommunicationsoveratwoorthreewireinterface.ThecombinationofaserialtwowireinterfaceandmicropowerconsumptionmakestheADS1286idealforremoteapplicationsandforthoserequiringisolation.TheADS1286isavailableina8-pinplasticminiDIPanda8-leadSOIC.12-BitMicroPowerSamplingANALOG-TO-DIGITALCONVERTER®FEATURESlSERIALINTERFACElGUARANTEEDNOMISSINGCODESl20kHzSAMPLINGRATElLOWSUPPLYCURRENT:250μASARControlSerialInterfaceDOUTComparatorS/HAmpCS/SHDNDCLOCK+InVREF–InCDACADS1286ADS1286APPLICATIONSlREMOTEDATAACQUISITIONlISOLATEDDATAACQUISITIONlTRANSDUCERINTERFACElBATTERYOPERATEDSYSTEMS©1996Burr-BrownCorporationPDS-1335BPrintedinU.S.A.October,1998InternationalAirportIndustrialPark•MailingAddress:POBox11400,Tucson,AZ85734•StreetAddress:6730S.TucsonBlvd.,Tucson,AZ85706•Tel:[phone]Twx:910-952-1111•Internet:•Cable:BBRCORP•Telex:066-6491•FAX:[phone]•ImmediateProductInfo:(800)548-61322®ADS1286SPECIFICATIONSAtTA=TMINtoTMAX,+VCC=+5V,VREF=+5V,fSAMPLE=12.5kHz,,fCLK=16•fSAMPLE,unlessotherwisespecified.TIMINGCHARACTERISTICSfCLK=200kHz,TA=TMINtoTMAX.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITStSMPLAnalogInputSampleTimeSeeOperatingSequence1.52.0ClkCyclestSMPL(MAX)MaximumSamplingFrequencyADS128620kHztCONVConversionTimeSeeOperatingSequence12ClkCyclestdDODelayTIme,DCLOCK↓toDOUTDataValidSeeTestCircuits85150nstdisDelayTIme,CS↑toDOUTHi-ZSeeTestCircuits2550nstenDelayTIme,DCLOCK↓toDOUTEnableSeeTestCircuits50100nsthDOOutputDataRemainsValidAfterDCLOCK↓CLOAD=100pF1530nstfDOUTFallTimeSeeTestCircuits70100nstrDOUTRiseTimeSeeTestCircuits60100nstCSDDelayTime,CS↓toDCLOCK↓SeeOperatingSequence0nstSUCSDelayTime,CS↓toDCLOCK↑SeeOperatingSequence30nsADS1286,ADS1286AADS1286K,ADS1286BADS1286C,ADS1286LPARAMETERCONDITIONSMINTYPMAXMINTYPMAXMINTYPMAXUNITSANALOGINPUTFull-ScaleInputRange+In–(–In)0VREF[[[[VAbsoluteInputVoltage+In–0.2VCC+0.2[[[[V–In–0.2+0.2[[[[VCapacitance25[[pFLeakageCurrent±1[[μASYSTEMPERFORMANCEResolution12[[BitsNoMissingCodes12[[BitsIntegralLinearity±1±2[[±0.5±1LSBDifferentialLinearity±0.5±1.0[±0.75±0.25±0.75LSBOffsetError0.75±3[[[[LSBGainError±2±8[[[[LSBNoise50[[μVrmsPowerSupplyRejection82[[dBSAMPLINGDYNAMICSConversionTime12[[ClkCyclesAcquisitionTime1.5[[ClkCyclesSmallSignalBandwidth500[[kHzDYNAMICCHARACTERISTICSTotalHarmonicDistortionVIN=5.0Vp-pat1kHz–85[[dBVIN=5.0Vp-pat5kHz–83[[dBSINADVIN=5.0Vp-pat1kHz72[[dBSpuriousFreeDynamicRangeVIN=5.0Vp-pat1kHz90[[dBREFERENCEINPUTREFInputRange1.252.5VCC+0.05V[[[[[[VInputResistanceCS=VCC5000[[MΩCS=GND,fCLK=0Hz5000[[MΩCurrentDrainCS=VCC0.012.5[[[[μAtCYC≥640μs,fCLK≤25kHz2.420[[[[μAtCYC=80μs,fCLK=200kHz2.420[[[[μADIGITALINPUT/OUTPUTLogicFamilyCMOS[[LogicLevels:VIHIIH=+5μA3+VCC[[[[VVILIIL=+5μA0.00.8[[[[VVOHIOH=250μA3+VCC[[[[VVOLIOL=250μA0.00.4[[[[VDataFormatStraightBinary[[POWERSUPPLYREQUIREMENTSPowerSupplyVoltageVCC+4.5055.25[[[[[[VQuiescentCurrent,VANAtCYC≥640μS,fCLK≤25kHz200400[[[[μAtCYC=90μS,fCLK=200kHz250500[[[[μAPowerDownCS=VCC3[[μATEMPERATURERANGESpecifiedPerformanceADS1286,K,L0+70[[[[°CADS1286A,B,C–40+85[[[[°C[Specificationssameasgradetotheleft.3®ADS1286ELECTROSTATICDISCHARGESENSITIVITYElectrostaticdischargecancausedamagerangingfromper-formancedegradationtocompletedevicefailure.Burr-BrownCorporationrecommendsthatallintegratedcircuitsbehandledandstoredusingappropriateESDprotectionmethods.ESDdamagecanrangefromsubtleperformancedegrada-tiontocompletedevicefailure.Precisionintegratedcircuitsmaybemoresusceptibletodamagebecauseverysmallparametricchangescouldcausethedevicenottomeetpublishedspecifications.ABSOLUTEMAXIMUMRATINGS(1)+VCC.....................................................................................................+6VAnalogInput.......................................................–0.3Vto(+VCC+300mV)LogicInput.........................................................–0.3Vto(+VCC+300mV)CaseTemperature.........................................................................+100°CJunctionTemperature....................................................................+150°CStorageTemperature.....................................................................+125°CExternalReferenceVoltage..............................................................+5.5VNOTE:(1)Stressesabovetheseratingsmaypermanentlydamagethedevice.PINCONFIGURATION12348765+VCCDCLOCKDOUTCS/SHDNVREF+In–InGNDADS12868-PinMiniPDIP8-LeadSOICPINASSIGNMENTSPINNAMEDESCRIPTION1VREFReferenceInput.2+InNonInvertingInput.3–InInvertingInput.Connecttogroundorremotegroundsensepoint.4GNDGround.5CS/SHDNChipSelectwhenlow,ShutdownModewhenhigh.6DOUTTheserialoutputdatawordiscomprisedof12bitsofdata.InoperationthedataisvalidonthefallingedgeofDCLOCK.ThesecondclockpulseafterthefallingedgeofCSenablestheserialoutput.Afteronenullbitthedataisvalidforthenext12edges.7DCLOCKDataClocksynchronizestheserialdatatransferanddeterminesconversionspeed.