标签: 0-20ma

Abstract:Thisarticleshowsanexampleofimplementinga4-20mAor0-20mAcurrent-loopoutputusingavoltageoutputdigital-to-analogconverter(DAC)andaVtoIconverter.Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSAMPLIFIERANDCOMPARATORCIRCUITSSWITCHESANDMULTIPLEXERSKeywords:4-20mA,0-20mA,currentloop,currentlooptransmission,DAC,V/I,VtoI,converter,digitaltoMay31,2002analogconverterAPPLICATIONNOTE1085Selectable-RangeCurrentLoopAbstract:Thisarticleshowsanexampleofimplementinga4-20mAor0-20mAcurrent-loopoutputusingavoltageoutputdigital-to-analogconverter(DAC)andaVtoIconverter.Current-loopsignals,asopposedtovoltagesignals,arecommonlyusedinindustrialsystemsbecausetheyaremuchlesssubjecttonoiseandrelativelyindifferenttolinelength(becausethecurrentisunaffectedbylineresistance).ThecircuitofFigure1allowsdigitalselectionbetweenthetwostanda……

Abstract:Thefragilecurrent-shuntresistorintheanalogfrontendofanisolated0–20mAprecisioncurrentloopcanbeprotectedbyafastfuseoranautomaticcurrent-limitingswitch.Thecircuitshown,however,isfasterthanafuse,requiresnoreplacement,and(unliketheswitch)providesmicroprocessorcontrolwithanoptiontologthefaultevents.Thecircuitincludesacomparator(MAX9910),amicroprocessorsupervisorwithwatchdogtimer(MAX6706),aD-typeflip-flop,anNORgate,anORgate,andasolid-staterelay.Maxim>Designsupport>Appnotes>AmplifierandComparatorCircuits>APP4850Maxim>Designsupport>Appnotes>MicroprocessorSupervisorCircuits>APP4850Maxim>Designsupport>Appnotes>ProtectionandIsolation>APP4850Keywords:0-20mAcurrentloop,analogfrontend,AFE,current-shuntresistor,shuntprotectionFeb15,2011APPLICATIONNOTE4850MicrocontrollerControlsCurrent-LoopAFEProtectionBy:AnatolyAndrusevichAbstract:Thefragilecurrent-shuntresistorintheanalogfrontendofanisolated0……

0-20mA的电流回路输出电压输出数字-模拟转换器（DAC）和一个I转换至五例如。Maxim>AppNotes>A/DandD/ACONVERSION/SAMPLINGCIRCUITSAMPLIFIERANDCOMPARATORCIRCUITSSWITCHESANDMULTIPLEXERSKeywords:4-20mA,0-20mA,currentloop,currentlooptransmission,DAC,V/I,VtoI,converter,digitaltoMay31,2002analogconverterAPPLICATIONNOTE1085Selectable-RangeCurrentLoopAbstract:Thisarticleshowsanexampleofimplementinga4-20mAor0-20mAcurrent-loopoutputusingavoltageoutputdigital-to-analogconverter(DAC)andaVtoIconverter.Current-loopsignals,asopposedtovoltagesignals,arecommonlyusedinindustrialsystemsbecausetheyaremuchlesssubjecttonoiseandrelativelyindifferenttolinelength(becausethecurrentisunaffectedbylineresistance).ThecircuitofFigure1allowsdigitalselectionbetweenthetwostanda……