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AD694 4 20mA Monolithic Current Transmitter IC
The AD694 is a high-performance, monolithic 4–20mA current transmitter IC designed by Analog Devices for precision industrial signal transmission. It converts a standard voltage input (0–5V or 0–10V) into a two-wire 4–20mA current output, providing an easy and accurate interface between sensors, transducers, and control systems.
This single-chip solution integrates a precision voltage reference, voltage-to-current converter, amplifier, and output stage, ensuring excellent accuracy, stability, and low drift over a wide temperature and supply range. The AD694 greatly simplifies design complexity in industrial process control and instrumentation systems.
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Features:-
- • 4–20 mA, 0–20 mA Output Ranges
- • Pre-calibrated 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
Specification:-
| Parameter | Specification |
| Supply Voltage | 36 V |
| VS to IOUT | 36 V |
| Input Voltage | –0.3 V to +36 V |
| Reference Short Circuit to Common | Indefinite |
| 4 mA On/Off | 0 V to 36 V |
| Lead Temperature | 300°C |
| Storage Temperature Range | ?65°C to +150°C |
Applications:
- Industrial process control transmitters
- Sensor and transducer signal conditioning
- 4–20mA current loop systems
- Factory automation and instrumentation
- PLC and DCS analog input modules
- Data acquisition and telemetry systems
- Remote sensing for pressure, temperature, or flow signals
*Product image for illustration purposes only, actual product may vary.
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