Description

The AD694AQ is a monolithic current transmitter designed for use in process control applications. It accepts high level signal inputs and converts them to a standard 4-20 mA current loop, which can be used to control valves, actuator, and other devices. The input signal is buffered by an input amplifier, allowing for scaling or buffering of the output from a current mode DAC. The AD694AQ offers precalibrated input spans of 0 V to 2 V and 0 V to 10 V, with the option to program other spans using external resistors.

Specifications and Features

• 4-20 mA and 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

Application Scenarios

The AD694AQ is commonly used in process control applications where high level signal inputs need to be converted to a 4-20 mA current loop. It is well-suited for controlling valves, actuators, and other devices used in industrial settings. The wide power supply range and wide output compliance make it adaptable to various operating conditions.

Comparison

• Wide power supply range allows for flexibility in different applications
• Precalibrated input ranges simplify the setup process
• Optional external pass transistor helps reduce self-heating errors
• High precision and low nonlinearity for accurate signal conversion

• No specific disadvantages reported