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.