ads8688

PRODUCTPREVIEW-0.05-0.03-0.010.010.030.05±40±7265992125Gain(%FS)Free-AirTemperature(oC)C026-----±2.5VREF-----±1.25VREF-----±0.625VREF------+2.5VREF------+1.25VREFMultiplexerOscillatorCSSCLKSDISDODAISYREFSELRST/PDREFCAPREFIOPGA1M:OVP1M:2nd-OrderLPFADCDriverVB0AIN_0PAIN_0GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB1AIN_1PAIN_1GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB2AIN_2PAIN_2GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB3AIN_3PAIN_3GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB4AIN_4PAIN_4GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB5AIN_5PAIN_5GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB6AIN_6PAIN_6GNDOVPPGA1M:OVP1M:2nd-OrderLPFADCDriverVB7AIN_7PAIN_7GNDOVPAUX_INAUX_GND16-bitSARADCDigitalLogic&Interface4.096VReferenceREFGNDDGNDAGNDDVDDAVDDAdditionalChannelsinADS8688ADS8688ADS8684ProductFolderSample&BuyTechnicalDocumentsTools&SoftwareSupport&CommunityADS8684,ADS8688SBAS582A–JULY2014–REVISEDJULY2014ADS868x16-Bit,500-kSPS,4-and8-Channel,Single-Supply,SARADCswithBipolarInputRanges1Features2Applications1•16-BitADCwithIntegratedAnalogFront-End•PowerAutomation•4-,8-ChannelMUXwithAutoandManualScan•ProtectionRelays•Channel-IndependentProgrammableInput•PLCAnalogInputModulesRanges:3Description–Bipolar:±10.24V,±5.12V,and±2.56VTheADS8684andADS8688are4-and8-channel,–Unipolar:0Vto10.24Vand0Vto5.12Vintegrateddataacquisitionsystemsbasedona16-bit•5-VAnalogSupply:1.65-Vto5-VI/OSupplysuccessiveapproximation(SAR)analog-to-digital•ConstantResistiveInputImpedance:1MΩconverter(ADC),operatingatathroughputof500kSPS.Thedevicesfeatureintegratedanalog•InputOvervoltageProtection:Upto±20Vfront-endcircuitryforeachinputchannelwith•On-Chip,4.096-VReferencewithLowDriftovervoltageprotectionupto±20V,a4-or8-channel•ExcellentPerformance:multiplexerwithautomaticandmanualscanningmodes,andanon-chip,4.096-Vreferencewithlow–500-kSPSAggregateThroughputtemperaturedrift.Operatingonasingle5-Vanalog–DNL:±0.5LSB;INL:±0.75LSBsupply,eachinputchannelonthedevicescan–LowDriftforGainErrorandOffsetsupporttruebipolarinputrangesof±10.24V,±5.12V,and±2.56V,aswellasunipolarinput–SNR:92dB;THD:–102dBrangesof0Vto10.24Vand0Vto5.12V.Thegain–LowPower:65mWoftheanalogfront-endforallinputrangesis•AUXInput→DirectConnectiontoADCInputsaccuratelytrimmedtoensureahighdcprecision.The•SPI™-CompatibleInterfacewithDaisy-Chaininputrangeselectionissoftware-programmableandindependentforeachchannel.Thedevicesoffera•–40°Cto125°CIndustrialTemperatureRange1-MΩconstantresistiveinputimpedanceirrespective•TSSOP-38Package(9.7mm×4.4mm)oftheselectedinputrange.TheADS8684andADS8688offerasimpleSPI-compatibleserialinterfacetothedigitalhostandalsosupportdaisy-chainingofmultipledevices.Thedigitalsupplyoperatesfrom1.65Vto5.25V,enablingdirectinterfacetoawiderangeofhostcontrollers.DeviceInformation(1)PARTNUMBERPACKAGEBODYSIZE(NOM)ADS868xTSSOP(38)9.70mm×4.40mm(1)Forallavailablepackages,seetheorderableaddendumattheendofthedatasheet.GainErrorversusTemperature1AnIMPORTANTNOTICEattheendofthisdatasheetaddressesavailability,warranty,changes,useinsafety-criticalapplications,intellectualpropertymattersandotherimportantdisclaimers.PRODUCTPREVIEWInformation.Productindesignphaseofdevelopment.Subjecttochangeordiscontinuancewithoutnotice.PRODUCTPREVIEWADS8684,ADS8688SBAS582A–JULY2014–REVISEDJULY2014:Pagenumbersforpreviousrevisionsmaydifferfrompagenumbersinthecurrentversion.ChangesfromOriginal(July2014)toRevisionAPage•Madechangestoproductpreviewdatasheet........................................................................................................................12SubmitDocumentationFeedbackCopyright©2014,TexasInstrumentsIncorporatedProductFolderLinks:ADS8684ADS8688PRODUCTPREVIEWADS8684,ADS8688–JULY2014–REVISEDJULY20145DeviceandDocumentationSupport5.1DocumentationSupport5.1.1RelatedDocumentationForrelateddocumentationseethefollowing:•OPA320DataSheet,SBOS5135.2RelatedLinksThetablebelowlistsquickaccesslinks.Categoriesincludetechnicaldocuments,supportandcommunityresources,toolsandsoftware,andquickaccesstosampleorbuy.Table1.RelatedLinksTECHNICALTOOLS&SUPPORT&PARTSPRODUCTFOLDERSAMPLE&BUYDOCUMENTSSOFTWARECOMMUNITYADS8684ClickhereClickhereClickhereClickhereClickhereADS8688Cli