[FAQ] What is a 3-wire 4-20mA current transmitter?

Katlynne Jones

Other Parts Discussed in Thread: XTR110, XTR111, XTR305, XTR300, DAC8760, DAC8775, DAC8750, DAC7750, DAC8771, DAC7760

What is a 3-wire 4-20mA current transmitter? How do I use one?

over 3 years ago

0 Katlynne Jones over 3 years ago

TI__Mastermind 21848 points

A 3-wire transmitter can be used with a local supply to transmit control data to remote devices. One wire is connected to the local supply of the transmitter. A second wire connects the shared ground of the transmitter and receiver. The third wire carries the analog output signal. The attached blog series will provide an overview and explain the design considerations of 3-wire systems.

Industrial DACs: An overview of analog output and architectures

Industrial DACs: An evolution of 3-wire analog outputs

Industrial DACs: Protecting 3-wire analog outputs

Industrial DACs: How to design universal 3-wire analog outputs

Input Isolation for 3-wire analog outputs

TI devices:

Analog input, analog output: XTR110, XTR111, XTR300, XTR305

Digital input, analog output: DAC8771, DAC8775, DAC8760, DAC8750, DAC7760, DAC7750

You can check out the post titled: Are there reference designs that can help me build a 4-20mA transmitter? For help finding reference designs using some of the above devices.