AD694
FEATURES
- 4- 20 m A, 0- 20 m A 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 pliance
- Input buffer amplifier
- Open-loop alarm
- Optional external pass transistor to reduce self-heating errors
- 0.002% typ nonlinearity
GENERAL DESCRIPTION
The AD694 is a monolithic current transmitter that accepts high level signal inputs to drive a standard 4- 20 m A current loop for the control of valves, actuators, and other devices monly 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 input 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.
The output stage pliance extends to within 2 V of VS and its special design...
