What is a 2-wire 4-20mA current transmitter? How do I use one?
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2-wire transmitters are loop powered devices most commonly used to monitor a remote process with no access to a local supply. Two analog signal wires carry both the analog output signal, and power for the sensor/monitoring circuitry and transmitter. The attached blog series will provide an overview and explain the design considerations of 2-wire systems.
Analog input, analog output: XTR101, XTR105, XTR106, XTR108, XTR112, XTR115, XTR116, XTR117
Digital input, analog output: DAC161S997, DAC161P997
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.