4-20mA电流环、电压电流转换芯片方案比较

发布时间：2020-05-31 15:48:25 来源：文档文库

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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 RANGE	13.5V to 40V	7V to 44V
NONLINEARITY	0.005%	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	IO = 10 [(Vref In/16) + (VIN1/4) + (VIN2/2)] /RSPAN	IO = 10 × Vvin/Rset
PROBABLE PRICE	90元	10元

Fig.1 XTR110 应用电路

XTR111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 RANGE	7.5V to 36V
PRECISION CURRENT SOURCES	0.8mA	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 Ω
Input Offset Voltage	VCM = 2V
PROBABLE PRICE	25元	50元	60元

Fig.3 XTR105/XTR112/XTR114原理图

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
RESOLUTION	16	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 PRICE	60元	50元	60元	50元