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1、ADIAD7685高性能过程控制模拟前端解决方案关键字：工业控制,过程控制,ADC,数据采集ADI公司的AD7685是16位电荷重新分布逐次逼近模数转换器(ADC),单电源2.3V-5.5V工作,包括有不丢失码的低功耗高速16位取样ADC,内部转换时钟,以及多功能串口.吞吐量250kSPS,INL典型为±0.6LSB,最大为±2LSB((±0.003%ofFSR)),20kHz的SINAD为93.5dB,THD为-110dB,假性差分模拟输入,主要用在手持设备,医疗仪器,移动通信,PDA,数据采集和仪器仪表
2、于过程控制.本文介绍了AD7685主要特性,多个电源应用电源框图,真正16位隔离同时取样采集系统框图,EVAL-AD76XXCB8/10-Pin评估板主要特性,电路图以及完整的过程控制用高速高CMRR精密模拟前端简化框图,EVAL-A-INPUT-1AZ评估板电路图和材料清单.TheAD7685isa16-bit,chargeredistributionsuccessiveapproximation,analog-to-digitalconverter(ADC)thatoperatesfromasingle
3、powersupply,VDD,between2.3Vto5.5V.Itcontainsalowpower,highspeed,16-bitsamplingADCwithnomissingcodes,aninternalconversionclock,andaversatileserialinterfaceport.Thepartalsocontainsalownoise,widebandwidth,shortaperturedelay,track-and-holdcircuit.OntheCNVrisin
4、gedge,itsamplesananaloginputIN+between0VtoREFwithrespecttoagroundsenseIN−.Thereferencevoltage,REF,isappliedexternallyandcanbesetuptothesupplyvoltage.Powerdissipationscaleslinearlywiththroughput. TheSPI-compatibleserialinterfacealsofeaturestheability,usingt
5、heSDIinput,todaisychainseveralADCsonasingle3-wirebusorprovidesanoptionalBUSYindicator.Itiscompatiblewith1.8V,2.5V,3V,or5VlogicusingtheseparatesupplyVIO. TheAD7685ishousedina10-leadMSOPora10-leadQFN(LFCSP)withoperationspecifiedfrom−40°Cto+85°C.AD7685主要特性: 1
6、6-bitresolutionwithnomissingcodes Throughput:250kSPS INL:±0.6LSBtypical,±2LSBmaximum(±0.003%ofFSR) SINAD:93.5dB@20kHz THD:−110dB@20kHz Pseudodifferentialanaloginputrange 0VtoVREFwithVREFuptoVDD Nopipelinedelay Single-supplyoperation2.3Vto5.5Vwith 1.8Vto5Vl
7、ogicinterface SerialinterfaceSPI®-/QSPI™-/MICROWIRE™-/DSP-compatible Daisy-chainmultipleADCs,BUSYindicator Powerdissipation 1.4μW@2.5V/100SPS 1.35mW@2.5V/100kSPS,4mW@5V/100kSPS Standbycurrent:1nA 10-leadpackage:MSOP(MSOP-8size)and 3mm×3mmQFN(LFCSP)(SOT-23s
8、ize) Pin-for-pin-compatiblewith10-leadMSOP/QFNPulSAR®ADCs AD7685应用:Battery-poweredequipment Medicalinstruments Mobilecommunications Personaldigitalassistants(PDAs) Dataacquisition Instrumentation Processcontr
