ADI AD74413R四通道软件可配置解决方案.docx
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ADI AD74413R四通道软件可配置解决方案.docx
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ADIAD74413R四通道软件可配置解决方案
ADIAD74413R四通道软件可配置输入/输出解决方案
ADI公司的AD74413R是用于建筑物和过程控制应用的四通道可软件配置输入/输出解决方案.AD74413R包含了模拟输出,模拟输入,数字输入,电阻温度检测器(RTD)和热电偶测量以及串行外设接口(SPI).器件具有16位Σ-Δ模数转换器(ADC)和四个可配置13位数模转换器(DAC),提供四个可配置输入/输出通路和一套诊断功能.器件的模式包括低矮压输出,电流输出,电压输入,外部供电电流输入,回路供电电流输入,外部RTD测量,数字输入逻辑以及回路供电数字输入.AD74413R还包括高精度2.5V内部基准电压用来驱动DAC和ADC.工作温度−40℃至+105℃,64引脚LFCSP封装.主要用在工业控制,过程控制,工厂自动化,马达驱动,建筑物控制系统.本文介绍了AD74413R主要特性,功能框图和详细功能框图,电阻测量配置图,数字输入逻辑模式配置图以及评估板EV-AD74413RSDZ主要特性,电路图,材料清单和PCB设计图.
TheAD74413Risaquad-channelsoftwareconfigurableinput/outputsolutionforbuildingandprocesscontrolapplications.TheAD74413Rcontainsfunctionalityforanalogoutput,analoginput,digitalinput,resistancetemperaturedetector(RTD),andthermocouplemeasurementsintegratedintoasinglechipsolutionwithaserialperipheralinterface(SPI).Thedevicefeaturesa16-bit,Σ-Δanalog-to-digitalconverter(ADC)andfourconfigurable,13-bitdigital-to-analogconverters(DACs)toprovidefourconfigurableinput/outputchannelsandasuiteofdiagnosticfunctions.ThereareseveralmodesrelatedtotheAD74413R.Thesemodesarevoltageoutput,currentoutput,voltageinput,externallypoweredcurrentinput,looppoweredcurrentinput,externalRTDmeasurement,digitalinputlogic,andlooppowereddigitalinput.TheAD74413Rcontainsahighaccuracy2.5VinternalreferencetodrivetheDACsandtheADC.
AD74413R主要特性:
Quad-channelsoftwareconfigurableinput/outputcircuit
Screwterminalstolerantto±40Vdc
Lineprotectorstoblockpowerfromthescrewterminalstosupplies
Userconfigurablemodes
Voltageinput
Currentinput
Voltageoutput
Currentoutput
Digitalinput
RTDmeasurement
Internal16-bit,Σ-ΔADCwithoptional50Hzand60Hzrejection
13-bitmonotonicDACs
Chargepumpfortruezerovoltageoutput
HART-compatible
Internaltemperaturesensor,±5℃accuracy
On-chipdiagnosticsincludingopencircuitandshort-circuitdetection
SPI-compatible
Temperaturerange:
−40℃to+105℃
64-leadLFCSP
AD74413R应用:
Processcontrol
Factoryautomation
Motordrives
Buildingcontrolsystems
图1.AD74413R功能框图
图2.AD74413R详细功能框图
图3.AD74413R电阻测量配置图
图4.AD74413R数字输入逻辑模式配置图
评估板EV-AD74413RSDZ
EvaluatingtheAD74413RQuad-Channel,SoftwareConfigurableInputandOutputTheEV-AD74413RSDZ(seeFigure5)isafullyfeaturedevaluationboardthatcanbeusedtoevaluatethefeaturesoftheAD74413R.
TheAD74413Risaquad-channel,softwareconfigurable,inputandoutputdevice.Thedevicehasfunctionalityforanalogoutput,analoginput,digitalinput,andresistancetemperaturedetector(RTD)measurementsintegratedintoasinglechipsolutionwithaserialperipheralinterface(SPI).
TheEV-AD74413RSDZcanbecontrolledviaasystemdemonstrationplatform(SDP).TheSDP-ScontrolstheEVAD74413RSDZviatheUSBportofaPCusingtheAD74413Revaluationsoftware.
TheEV-AD74413RSDZrequiresanAVDDoperatingsupplyof14Vto28.8V.WhentheEV-AD74413RSDZisconnectedtothePC,thePCpowerstheSDP-S.
SeetheAD74413RdatasheetformoreinformationabouttheAD74413R,andusersmustconsultthedatasheetinconjunctionwiththisuserguidewhenusingtheEV-AD74413RSDZ.
评估板EV-AD74413RSDZ主要特性:
FullyfeaturedevaluationboardfortheAD74413R
On-board2.5VADR4525reference
SPI-compatible
PC-basedsoftwareforcontrol
EVALUATIONKITCONTENTS
EV-AD74413RSDZevaluationboard
图5.评估板EV-AD74413RSDZ外形图
图6.评估板EV-AD74413RSDZ电路图
(1)
图7.评估板EV-AD74413RSDZ电路图
(2)
图8.评估板EV-AD74413RSDZ电路图(3)
图9.评估板EV-AD74413RSDZ电路图(4)
评估板EV-AD74413RSDZ材料清单:
图10.评估板EV-AD74413RSDZPCB设计图
(1)
图11.评估板EV-AD74413RSDZPCB设计图
(2)
图12.评估板EV-AD74413RSDZPCB设计图(3)
图13.评估板EV-AD74413RSDZPCB设计图(4)
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