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Analog Devices Semiconductor Electronic Components Datasheet

AD694 Datasheet

4.20 mA Transmitter

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AD694 pdf
a
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
4–20 mA Transmitter
AD694
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
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
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 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.
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.
PRODUCT HIGHLIGHTS
1. The AD694 is a complete voltage in to 4–20 mA out current
transmitter.
2. Pin programmable input ranges are precalibrated 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.
5. The AD694 interfaces directly to 8-, 10-, and 12-bit single
supply CMOS and bipolar DACs.
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.
REV. B
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 that
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: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002


Analog Devices Semiconductor Electronic Components Datasheet

AD694 Datasheet

4.20 mA Transmitter

No Preview Available !

AD694 pdf
AD694–SPECIFICATIONS (@ +25؇C, RL = 250 , and VS = +24 V, unless otherwise noted.)
Model
AD694JN/AQ/AR
Min Typ
Max
AD694BQ/BR
Min Typ
Max
Unit
INPUT CHARACTERISTICS
Input Voltage Range
Input Bias Current
Either Input, TMIN to TMAX
Offset Current, TMIN to TMAX
Offset Current Drift
Input Impedance
–0.2
VS –2.0 V VS –2.5 V –0.2
VS –2.0 V VS –2.5 V V
1.5 5
1.5 5
nA
± 0.1 ؎1
± 0.1 ؎1
nA
± 1.0 ± 5.0
± 1.0 ± 5.0 pA/°C
5 5 M
OUTPUT CHARACTERISTICS
Operating Current Range
Specified Performance
Output Voltage Compliance
Output Impedance, 4–20 mA
Current Limit (@ 2 × FS Overdrive
Slew Rate
SPAN AND ZERO ACCURACY1
4 mA Offset Error @ 0 V Input2
Error from 4.000 mA, 4 mA On
Error from 0.000 mA, 4 mA Off
TMIN to TMAX
vs. Supply (2 V Span/10 V Span)
Trim Range, 4 mA Zero
Span
Nominal Transfer Function
Input FS = 2 V
Input FS = 10 V
Transfer Function Error from Nom,
Input FS = 2 V, 10 V
TMIN to TMAX
vs. Supply
Nonlinearity3
4 mA On: Max Pin 9 Voltage
4 mA Off: Min Pin 9 Voltage
0
4
VS –36 V
40.0
24
50.0
1.3
23
20
VS –2 V
44
0
4
VS –36 V
40.0 50.0
24
1.3
23
20
VS 2 V
44
mA
mA
V
M
mA
mA/µs
± 10 ؎20
± 5 ؎10 µA
0
+10 +20 0
+5 +10 µA
± 10 ؎40
± 5 ؎20 µA
0.3/0.05 0.8/0.4
0.3/0.05 0.8/0.4 µA/V
2.0
4.8 2.0
4.8 mA
8.0 8.0 mA/V
1.6 1.6 mA/V
± 0.1 ؎0.3
± 0.05 ؎0.15 % of Span
± 0.002 ± 0.005
± 0.001 ؎0.0025 % of Span/°C
± 0.001 ؎0.005
± 0.001 ؎0.005 % of Span/V
± 0.005 ؎0.015
± 0.001 ؎0.005 % of Span
0.8 0.8 V
3.0 2.5
3.0 2.5
V
VOLTAGE REFERENCE
Output Voltage: 10 V Reference
Output Voltage: 2 V Reference
TMIN to TMAX4
vs. Load, VREF = 2 V, 10 V
vs. Supply, VREF = 2 V, 10 V
Output Current
Source
Sink
9.960
1.992
5
10.000
2.000
30
0.15
± 0.001
0.2
10.040
2.008
50
0.50
؎0.005
9.980
1.996
10.000
2.000
20
0.15
± 0.001
10.020
2.004
30
0.50
؎0.005
V
V
ppm/°C
mV/mA
%/V
5
0.2
mA
mA
ALARM CHARACTERISTICS
VCE(SAT) @ 2.5 mA
Leakage Current
Alarm Pin Current (Pin 10)
0.35
؎1
20
0.35
؎1
20
V
µA
mA
POWER REQUIREMENTS
Specified Performance
Operating Range
2 V FS, VREF = 2 V
2 V, 10 V FS, VREF = 2 V, 10 V
Quiescent Current, 4 mA Off
24
4.5
12.5
1.5
24
36 4.5
36 12.5
2.0 1.5
V
36 V
36 V
2.0 mA
TEMPERATURE RANGE
Specified Performance5 AD694AQ/BQ/AR/BR –40
AD694JN
0
Operating
AD694AQ/BQ/AR/BR –55
AD694JN
–40
+85
+70
+125
+85
–40
0
–55
–40
+85
+70
+125
+85
°C
°C
°C
°C
–2– REV. B


Part Number AD694
Description 4.20 mA Transmitter
Maker Analog Devices
Total Page 16 Pages
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