Monolithic IC for Process-Control Transmitters

AD693 Excites and Conditions Sensor, Interfaces to 20-mA Current Loop; Uses Loop Power; Includes Auxiliary Amplifier, Scaling, and References

Although the digital transmission of data is a widely discussed technique in modern data-acquisition systems, many applications convey remote information effectively and economically using analog signals. In process control, controlled currents with spans of 4 to 20 mA or 0 to 20 mA carry analog data for long distances over two wires (0-to-20 mA loops need a third lead for power), representing such sensor variables as temperature, pressure, speed, or flow, with accuracy, reliability, and low-cost. Read full article



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Paul Brokaw

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James Doscher