Single Circuit Amplifier IC Chip / Mono Current Transmitter 4-20mA AD694ARZ-REEL
instrumentation amplifier chip
,operational amplifier chi
AD694ARZ-REEL Mono Current Transmitter SOIC-16 4-20mA Amplifier IC Chip Single Circuit
| 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 |
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
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