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1、TIADS8688八路数据采集系统开发方案TI公司的ADS8688是基于16位逐次逼近(SAR)模数转换器(ADC)的八路数据采集系统,工作在500kSPs的吞吐量.双极工作电源±10.24V,±5.12V和±2.56V,单极工作电源0V到10.24V和0V到5.12V,输出保护电压高达成±20V,低功耗65mW,具有极好的性能:SNR:92dB;THD:–102dB.主要用于工业控制,PLC和数据采集系统.本文介绍了ADS8688主要特性,框图,以及在电源自动化和PLC的数据采集系统框图,ADS8688EVM-PDK评估模块主要特性和GUI主要特性,电
2、路图,材料清单和六层PCB设计图.TheADS8684andADS8688are4-and8-channel,integrateddataacquisitionsystemsbasedona16-bitsuccessiveapproximation(SAR)analog-to-digitalconverter(ADC),operatingatathroughputof500kSPS.Thedevicesfeatureintegratedanalogfront-endcircuitryforeachinputchannelwithovervoltagepr
3、otectionupto±20V,a4-or8-channelmultiplexerwithautomaticandmanualscanningmodes,andanon-chip,4.096-Vreferencewithlowtemperaturedrift.Operatingonasingle5-Vanalogsupply,eachinputchannelonthedevicescansupporttruebipolarinputrangesof±10.24V,±5.12V,and±2.56V,aswellasunipolarinputrangeso
4、f0Vto10.24Vand0Vto5.12V.Thegainoftheanalogfront-endforallinputrangesisaccuratelytrimmedtoensureahighdcprecision.Theinputrangeselectionissoftware-programmableandindependentforeachchannel.Thedevicesoffera1-MΩconstantresistiveinputimpedanceirrespectiveoftheselectedinputrange.TheADS8
5、684andADS8688offerasimpleSPI-compatibleserialinterfacetothedigitalhostandalsosupportdaisy-chainingofmultipledevices.Thedigitalsupplyoperatesfrom1.65Vto5.25V,enablingdirectinterfacetoawiderangeofhostcontrollers.ADS8688主要特性:16-BitADCwithIntegratedAnalogFront-End4-,8-ChannelMUXwithA
6、utoandManualScanChannel-IndependentProgrammableInputRanges:Bipolar:±10.24V,±5.12V,and±2.56VUnipolar:0Vto10.24Vand0Vto5.12V5-VAnalogSupply:1.65-Vto5-VI/OSupplyConstantResistiveInputImpedance:1MΩInputOvervoltageProtection:Upto±20VOn-Chip,4.096-VReferencewithLowDriftExcellentPerform
7、ance:500-kSPSAggregateThroughputDNL:±0.5LSB;INL:±0.75LSBLowDriftforGainErrorandOffsetSNR:92dB;THD:–102dBLowPower:65mWAUXInput→DirectConnectiontoADCInputsSPI™-CompatibleInterfacewithDaisy-Chain–40℃to125℃IndustrialTemperatureRangeTSSOP-38Package(9.7mm×4.4mm)图1.ADS8688功能框图图2.用于电源自动化
8、的ADS8688八路复用数据采集系统框图图3.用于PLC的ADS868816位八
