PRODUCT DESCRIPTION

The AD694 is a monolithic current transmitter that accepts high level signal inputs to drive a standard 4–20 mA current loop for the control of valves, actuators, and other devices commonly used in process control. The input signal is buffered by an input amplifier that can be used to scale the input signal or buffer the output from a current mode DAC. Precalibrated in put spans of 0 V to 2 V and 0 V to 10 V are selected by simple pin strapping; other spans may be programmed with external resistors.

FEATURES

4–20 mA, 0–20 mA Output Ranges

Precalibrated Input Ranges: 0 V to 2 V, 0 V to 10 V

Precision Voltage Reference

  Programmable to 2.000 V or 10.000 V

Single or Dual Supply Operation

Wide Power Supply Range: 4.5 V to 36 V

Wide Output Compliance

Input Buffer Amplifier

Open-Loop Alarm

Optional External Pass Transistor to Reduce Self-Heating Errors

0.002% Typ Nonlinearity