AD7685CRMZ中文资料

16-Bit,250kSPSPulSARADCinMSOP/QFNAD7685Rev.BInformationfurnishedbyAnalogDevicesisbelievedtobeaccurateandreliable.However,noresponsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorotherrightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.NolicenseisgrantedbyimplicationorotherwiseunderanypatentorpatentrightsofAnalogDevices.Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.OneTechnologyWay,P.O.Box9106,Norwood,MA02062-9106,U.S.A.Tel:[phone]©2004–2007AnalogDevices,Inc.Allrightsreserved.FEATURES16-bitresolutionwithnomissingcodesThroughput:250kSPSINL:±0.6LSBtypical,±2LSBmaximum(±0.003%ofFSR)SINAD:93.5dB@20kHzTHD:−110dB@20kHzPseudodifferentialanaloginputrange0VtoVREFwithVREFuptoVDDNopipelinedelaySingle-supplyoperation2.3Vto5.5Vwith1.8Vto5VlogicinterfaceSerialinterfaceSPI®-/QSPI™-/MICROWIRE™-/DSP-compatibleDaisy-chainmultipleADCs,BUSYindicatorPowerdissipation1.4μW@2.5V/100SPS1.35mW@2.5V/100kSPS,4mW@5V/100kSPSStandbycurrent:1nA10-leadpackage:MSOP(MSOP-8size)and3mm×3mmQFN(LFCSP)(SOT-23size)Pin-for-pin-compatiblewith10-leadMSOP/QFNPulSAR®ADCsAPPLICATIONSBattery-poweredequipmentMedicalinstrumentsMobilecommunicationsPersonaldigitalassistants(PDAs)DataacquisitionInstrumentationProcesscontrols02968-005CODE655360163843276849152INL(LSB)2.01.51.00.50–0.5–1.0–1.5–2.0POSITIVEINL=+0.33LSBNEGATIVEINL=–0.50LSBFigure1.IntegralNonlinearityvs.Code.APPLICATIONDIAGRAMAD7685REFGNDVDDIN+IN–VIOSDISCKSDOCNV1.8VTOVDD3-OR4-WIREINTERFACE(SPI,DAISYCHAIN,CS)0.5VTOVDD2.5VTO5V0TOVREF02968-001Figure2.Table1.MSOP,QFN(LFCSP)/SOT-2314-/16-/18-BitPulSARADCType100kSPS250kSPS400kSPSto500kSPS1000kSPSADCDriver18-BitTrueAD7691AD7690AD7982ADA4941DifferentialAD7982ADA484116-BitTrueAD7684AD7687AD7688ADA4941DifferentialAD7693ADA484116-BitPseudoAD7680AD7685AD7686AD7980ADA4841DifferentialAD7683AD769414-BitPseudoAD7940AD7942AD7946ADA4841DifferentialGENERALDESCRIPTIONTheAD7685isa16-bit,chargeredistributionsuccessiveapproximation,analog-to-digitalconverter(ADC)thatoperatesfromasinglepowersupply,VDD,between2.3Vto5.5V.Itcontainsalowpower,highspeed,16-bitsamplingADCwithnomissingcodes,aninternalconversionclock,andaversatileserialinterfaceport.Thepartalsocontainsalownoise,widebandwidth,shortaperturedelay,track-and-holdcircuit.OntheCNVrisingedge,itsamplesananaloginputIN+between0VtoREFwithrespecttoagroundsenseIN−.Thereferencevoltage,REF,isappliedexternallyandcanbesetuptothesupplyvoltage.Powerdissipationscaleslinearlywiththroughput.TheSPI-compatibleserialinterfacealsofeaturestheability,usingtheSDIinput,todaisychainseveralADCsonasingle3-wirebusorprovidesanoptionalBUSYindicator.Itiscompatiblewith1.8V,2.5V,3V,or5VlogicusingtheseparatesupplyVIO.TheAD7685ishousedina10-leadMSOPora10-leadQFN(LFCSP)withoperationspecifiedfrom−40°Cto+85°C.AD7685Rev.B|Page2of28TABLEOFCONTENTSFeatures..............................................................................................1Applications.......................................................................................1ApplicationDiagram........................................................................1GeneralDescription.........................................................................1RevisionHistory...............................................................................2Specifications.....................................................................................3TimingSpecifications.......................................................................5AbsoluteMaximumRatings............................................................7ESDCaution..................................................................................7PinConfigurationandFunctionDescriptions.............................8Terminology......................................................................................9TypicalPerformanceCharacteristics...........................................10TheoryofOperation......................................................................13CircuitInformation....................................................................13ConverterOperation..................................................................13TypicalConnectionDiagram...................................................14AnalogInputs..............................................................................15DriverAmplifierChoice...........................................................16VoltageReferenceInput............................................................16PowerSupply...............................................................................16SupplyingtheADCfromtheReference..................................17DigitalInterface..........................................................................17CSMode3-Wire,NoBUSYIndicator.....................................18CSMode3-WirewithBUSYIndicator...................................19CSMode4-Wire,NoBUSYIndicator..................................