FEATURES

• Wide Supply Voltage Range: 6...35V

• Wide Operating Temperature Range:

–40°C...+85°C

• Adjustable Voltage Reference:

4.5 to 10V

• Operational Amplifier Input:

0.5...4.5V, 0...5V, other

• Adjustable Offset Current

• Available as Three– (0/4...20mA) or

Two–Wire Version (4...20mA)

• Adjustable Output Current Range

• Protection Against Reverse Polarity

• Protected Current Output

APPLICATIONS

• Sensor Interface

• Industrial Process Control

• Programmable Current Source

• Current Source Reference

GENERAL DESCRIPTION

The AM422 is a low cost monolithic voltage–

to–current converter specially designed for

analog signal transmission. The AM422 is

available in a 3– or 2–wire version, which allows

applications with flexible input voltage

ranges to be used for a standard output current.

Output current range and current offset level

are freely adjustable by external resistors. The

IC consists of three basic sections: an operational

amplifier input stage for single ended

input signals (0.5–4.5V, 0–10V, or other), a

programmable 4.5 to 10V reference for transducer

excitation, and a current output, freely

adjustable in a wide current range (4–20mA,

0–20mA, other). With the broad spectrum of

possible input signals the AM422 is a flexible

and multipurpose voltage–to–current converter

for single ended transducers or voltage transmission.