Analog Devices AN-21 4-20mA Digital to Process Current Transmitter Application Note

About this manual

The document details the construction of a 4-20mA process current transmitter using three integrated circuits: PMI REF-01CJ, DAC-08CQ, and OP-221. The design operates from dual power supplies (-5V/+1V and +23V/+7V) and features TTL logic input compatibility with 8-bit binary coding.

What's inside

• Theory of Operation
• Schematic Diagram
• Calibration Procedure
• Output Voltage Compliance
• Scale Modification
• Conclusion
• Parts List

Frequently asked questions

What power supplies are required to operate the converter?

The device operates from a -5V to +1V negative supply and a +23V to +7V positive supply.

What is the maximum output voltage compliance?

The converter has an output voltage compliance of 24V.

How long does it take for the output to settle at full scale into a 5000 load?

It takes 5 microseconds for the output to reach full scale settling time.