电流环电压电流转换芯片方案比较样本

4-20mA电流输出芯片比较

( 1) TI公司4-20mA电流输出芯片比较

Precision Voltage-to-Current Converter/Transmitter NAME XTR110 XTR111 SUPPLY RANGE13.5V to 40V7V to 44V NONLINEARITY0.005%0.002% INPUT 0V to +5V, 0V to +10V 0 to 12V

OUTPUT 0mA to 20mA, 5mA to 25mA Outputs

Other Ranges

0mA–20mA, 4mA–20mA, 5mA–25mA

AND VOLTAGE OUTPUTS

Output Current Equation I O = 10 [(Vref In/16) + (VIN1/4) +

(VIN2/2)] /RSPAN

I O = 10 × Vvin/Rset

PROBABLE PRICE 90元10元

Fig.1 XTR110应用电路

XTR111内部没有提供将0V输入转换成4mA输出的电路, 最常见的方法是采用两个电阻网络连接参考电压和输入信号进行分压输

入

Fig.2 XTR111 应用电路

4-20mA CURRENT TRANSMITTER

with Sensor Excitation and Linearization NAME XTR105 XTR112 XTR114 SUPPLY RANGE7.5V to 36V

PRECISION CURRENT SOURCES0.8mA 0.25mA 0.1mA INPUT EXCITATION 2- OR 3-WIRE RTD OPERATION

Output Current Equation IO = VIN • (40/RG) + 4mA, VIN in Volts, RG in ΩInput Offset Voltage VCM = 2V

PROBABLE PRICE 25元50元60元

Fig.3XTR105/XTR112/XTR114原理图

4-20mA Current-Loop Transmitter

NAME XTR115 XTR116 XTR117 SUPPLY RANGE7.5V to 36V7.5V to 40V V REF FOR SENSOR EXCITATION 2.5V 4.096V NC LOW QUIESCENT CURRENT 200µA 130 A LOW SPAN ERROR0.05%

LOW NONLINEARITY ERROR 0.003%

PROBABLE PRICE 20元15元

Fig.4 XTR115/XTR116/XTR117原理图

Fig.5 RCV42——4-20mA电流转0-5V电压基本连接

Fig.6 RCV42——4-20mA电流转0-5V电压实例