4-20mA電流環(huán)、電壓電流轉換芯片方案計劃比較

20mA電流輸出芯片比較（1）TI公司4-20mA電流輸出芯片比較PrecisionVoltage-to-CurrentConverter/TransmitterNAMEXTR110XTR111SUPPLYRANGEto40V7Vto44VNONLINEARITY%%INPUT0Vto+5V,0Vto+10V0to12VOUTPUT0mAto20mA,5mAto25mAOutputs

OtherRanges0mA–20mA,4mA–20mA,5mA–25mAANDVOLTAGEOUTPUTSOutputCurrentEquationIO=10[(VrefIn/16)+(VIN1/4)+(VIN2/2)]/RSPANIO=10×Vvin/RsetPROBABLEPRICE90元10元XTR110應用電路XTR111內部沒有提供將0V輸入轉換成4mA輸出的電路，最常用的方法是采用兩個電阻網(wǎng)絡連接參考電壓和輸入信號進行分壓輸入XTR111應用電路4-20mACURRENTTRANSMITTER

withSensorExcitationandLinearizationNAMEXTR105XTR112XTR114SUPPLYRANGEto36VPRECISIONCURRENTSOURCESINPUTEXCITATION2-OR3-WIRERTDOPERATIONOutputCurrentEquationIO=VIN?(40/RG)+4mA,VINinVolts,RGin?InputOffsetVoltageVCM=2VPROBABLEPRICE25元50元60元XTR105/XTR112/XTR114原理圖4-20mACurrent-LoopTransmitterNAMEXTR115XTR116XTR117SUPPLYRANGEto36Vto40VVFORSENSOREXCITATIONNCLOWQUIESCENTCURRENT200μA130ALOWSPANERROR%LOWNONLINEARITYERROR%PROBABLEPRICE20元15元XTR115/XTR116/XTR117原理圖RCV42——4-20mA電流轉0-5V電壓基本連接RCV42——4-20mA電流轉0-5V電壓實例XTR101--Precision,LowDrift4-20mATWO-WIRETRANSMITTERXTR106--4-20mACURRENTTRANSMITTERwithBridgeExcitationandLinearizationXTR108--4-20mA,TWO-WIRETRANSMITTER“Smart”ProgrammablewithSignalConditioningXTR300--IndustrialAnalogCurrent/VoltageOUTPUTDRIVER（2）AD公司4-20mA電流輸出芯片比較DACandCurrentTransmitterNAMEAD420AD5412AD5422AD694FUNCTIONDAC4–20mATransmitterRESOLUTION161216-SUPPLYRANGE12-32VAVDD:AVSS:Vto36VINPUT16BITDIGITALSerialInput12BITDIGITALSerialInput16BITDIGITALSerialInputPrecalibratedInputRanges:0Vto2V,0Vto10VOUTPUT4mAto20mA,0mAto20mA,

0mAto24Ma0Vto5V,0Vto10V,±5V,±10V4mAto20mA,0mAto20mA,

0mAto24mA0Vto5V,0Vto10V,±5V,±10V4mAto20mA,0mAto20mA,

0mAto24mA0Vto5V,0Vto10V,±5V,±10V4–20mA,0–20mAPROBABLEPRICE60元50元60元50元AD420—standardconfigurationAD5412/5422—inHARTconfigurationAD694—standardconfiguration（3）AMG公司4-20mA電流輸出芯片比較NAMEDESCRIPTIONPROBABLEPRICEAM40050元AM46040元AM46240元