4-20mA电流环、电压电流转换芯片方案比较

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，最常用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

IO = VIN • (40/RG) + 4mA, VIN in Volts, RG in Output Current Equation

Ω

Input 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 ERROR 0.05%

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

Fig.7 XTR101--Precision, Low Drift 4-20mA TWO-WIRE TRANSMITTER

Fig.8 XTR106-- 4-20mA CURRENT TRANSMITTER with Bridge Excitation and Linearization

Fig.9 XTR108-- 4-20mA, TWO-WIRE TRANSMITTER “Smart” Programmable with Signal

Conditioning

Fig.10 XTR300-- Industrial Analog Current/Voltage OUTPUT DRIVER

（2）AD公司4-20mA电流输出芯片比较

DAC and Current Transmitter

NAME AD420 AD5412 AD5422 AD694 FUNCTION DAC 4–20 mA Transmitter RESOLUTION16 12 16 - SUPPLY RANGE 12-32V AVDD:10.8-40V AVSS:-26.4-0V 4.5 V to 36 V

INPUT 16BIT DIGITAL

Serial Input 12BIT DIGITAL

Serial Input

16BIT DIGITAL

Serial Input

Precalibrated Input

Ranges:

0 V to 2 V, 0 V to 10 V

OUTPUT 4 mA to 20 mA,

0 mA to 20 mA,

0 mA to 24 Ma

0 V to 5 V, 0 V

to 10 V, ±5 V,

±10 V 4 mA to 20 mA,

0 mA to 20 mA,

0 mA to 24 mA

0 V to 5 V, 0 V

to 10 V, ±5 V,

±10 V

4 mA to 20 mA,

0 mA to 20 mA,

0 mA to 24 mA

0 V to 5 V, 0 V

to 10 V, ±5 V,

±10 V

4–20 mA, 0–20 mA

PROBABLE PRICE60元50元60元50元

Fig.11 AD420—standard configuration