How to Use High-Voltage and High-Current-Drive Op Amps in ±20mA or 4–20mA Current-Loop Systems

By: Maurizio Gavardoni

Abstract: This application note shows how to use a high-voltage, high-current-drive operational amplifier to convert a voltage signal into a ±20mA or 4–20mA current signal for use in process-control industrial applications. The MAX9943 op amp serves as the example device. Experiments are described and test results presented.