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AD694* PDF预览

AD694*

更新时间: 2024-10-27 23:27:23
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描述
4?0 mA Transmitter

AD694* 数据手册

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a
4–20 mA Transmitter  
AD694*  
FUNCTIONAL BLOCK DIAGRAM  
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  
PRODUCT HIGHLIGHTS  
The AD694 is a monolithic 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 com-  
monly 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 in-  
put 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  
resistor.  
1. The AD694 is a complete voltage in to 4–20 mA out current  
transmitter.  
2. Pin programmable input ranges are pre-calibrated at 0 V to  
2 V and 0 V to 10 V.  
3. The input amplifier may be configured to buffer and scale the  
input voltage, or to serve as an output amplifier for current  
output DACs.  
4. The output voltage compliance extends to within 2 V of the  
positive supply and below common. When operated with a  
5 V supply, the output voltage compliance extends 30 V be-  
low common.  
The output stage compliance extends to within 2 V of VS and its  
special design allows the output voltage to extend below com-  
mon in dual supply operation. An alarm warns of an open 4-to-  
20 mA loop or noncompliance of the output stage.  
5. The AD694 interfaces directly to 8-, 10-, and 12-bit single  
supply CMOS and bipolar DACs.  
Active laser trimming of the AD694’s thin film resistors results  
in high levels of accuracy without the need for additional adjust-  
ments and calibration. An external pass transistor may be used  
with the AD694 to off-load power dissipation, extending the  
temperature range of operation.  
6. The 4 mA zero current may be switched on and off with a  
TTL control pin, allowing 0–20 mA operation.  
7. An open collector alarm warns of loop failure due to open  
wires or noncompliance of the output stage.  
8. A monitored output is provided to drive an external pass  
transistor. The feature off-loads power dissipation to extend  
the temperature range of operation and minimize self-heating  
error.  
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 transmis-  
sion 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.  
*Protected by U.S. Patents: 30,586; 4,250,445; 4,857,862.  
REV. A  
Information furnished by Analog Devices is believed to be accurate and  
reliable. However, no responsibility is assumed by Analog Devices for its  
use, nor for any infringements of patents or other rights of third parties  
which may result from its use. No license is granted by implication or  
otherwise under any patent or patent rights of Analog Devices.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 617/329-4700  
Fax: 617/326-8703  

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