AD694ARZ-REEL Mono Current Transmitter SOIC-16 4-20mA Amplifier IC Chip Single Circuit
ORDERING GUIDE| Model | Temperature Range | Package Option* |
| AD694JN | 0°C to 70°C | N-16 |
| AD694AQ | –40°C to +85°C | Q-16 |
| AD694AR | –40°C to +85°C | R-16 |
| AD694BQ | –40°C to +85°C | Q-16 |
| AD694BR | –40°C to +85°C | R-16 |
FEATURES
4–20 mA, 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
PRODUCT DESCRIPTION
The AD694 is a mono current transmitter that accepts high level
signal inputs to drive a standard 4–20 mA current loop for the
control of valves, actuators, and other devices commonly 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 compliance extends to
within 2 V of VS and its special design allows the output voltage
to extend below common in dual supply operation.
An alarm warns of an open 4–20 mA loop or noncompliance of the
output stage. Active laser trimming of the AD694’s thin film
resistors results in high levels of accuracy without the need for
additional adjustments and calibration. An external pass transistor
may be used with the AD694 to off-load power dissipation, extending
the temperature range of operation.
The AD694 is the ideal building block for systems requiring noise
immune 4–20 mA signal transmission to operate valves, actuators,
and other control devices, as well as for the transmission of
process parameters such as pressure, temperature, or flow.
It is recommended as a replacement for discrete designs in a
variety of applications in industrial process control, factory
automation, and system monitoring.
The AD694 is available in hermetically sealed, 16-pin CERDIP and
plastic SOIC, specified over the –40°C to +85°C industrial
temperature range, and in a 16-pin plastic DIP, specified over the
0°C to +70°C temperature range.
Applications
Application areas include limit comparators, simple analog to
digital converters; pulse, squarewave and time delay generators;
wide range VCO; MOS clock timers; multivibrators and high voltage
digital logic gates.
• Battery Powered Applications
• Industrial Applications
