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Analog Devices Semiconductor Electronic Components Datasheet

AD693 Datasheet

Loop-Powered 4.20 mA Sensor Transmitter

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AD693 pdf
a
FEATURES
Instrumentation Amplifier Front End
Loop-Powered Operation
Precalibrated 30 mV or 60 mV Input Spans
Independently Adjustable Output Span and Zero
Precalibrated Output Spans: 4–20 mA Unipolar
0–20 mA Unipolar
12 ؎ 8 mA Bipolar
Precalibrated 100 RTD Interface
6.2 V Reference with Up to 3.5 mA of Current Available
Uncommitted Auxiliary Amp for Extra Flexibility
Optional External Pass Transistor to Reduce
Self-Heating Errors
Loop-Powered 4–20 mA
Sensor Transmitter
AD693
FUNCTIONAL BLOCK DIAGRAM
PRODUCT DESCRIPTION
The AD693 is a monolithic signal conditioning circuit which
accepts low-level inputs from a variety of transducers to control a
standard 4–20 mA, two-wire current loop. An on-chip voltage
reference and auxiliary amplifier are provided for transducer
excitation; up to 3.5 mA of excitation current is available when the
device is operated in the loop-powered mode. Alternatively, the
device may be locally powered for three-wire applications when
0–20 mA operation is desired.
Precalibrated 30 mV and 60 mV input spans may be set by
simple pin strapping. Other spans from 1 mV to 100 mV may
be realized with the addition of external resistors. The auxiliary
amplifier may be used in combination with on-chip voltages to
provide six precalibrated ranges for 100 RTDs. Output span
and zero are also determined by pin strapping to obtain the
standard ranges: 4–20mA, 12 ± 8 mA and 0–20 mA.
Active laser trimming of the AD693’s thin-film resistors result
in high levels of accuracy without the need for additional
adjustments and calibration. Total unadjusted error is tested on
every device to be less than 0.5% of full scale at +25°C, and less
than 0.75% over the industrial temperature range. Residual
nonlinearity is under 0.05%. The AD693 also allows for the use
of an external pass transistor to further reduce errors caused by
self-heating.
For transmission of low-level signals from RTDs, bridges and
pressure transducers, the AD693 offers a cost-effective signal
conditioning solution. It is recommended as a replacement for
discrete designs in a variety of applications in process control,
factory automation and system monitoring.
The AD693 is packaged in a 20-pin ceramic side-brazed DIP,
20-pin Cerdip, and 20-pin LCCC and is specified over the
–40°C to +85°C industrial temperature range.
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.
PRODUCT HIGHLIGHTS
1. The AD693 is a complete monolithic low-level voltage-to-
current loop signal conditioner.
2. Precalibrated output zero and span options include
4–20 mA, 0–20 mA, and 12 ± 8 mA in two- and three-wire
configurations.
3. Simple resistor programming adds a continuum of ranges
to the basic 30 mV and 60 mV input spans.
4. The common-mode range of the signal amplifier input
extends from ground to near the device’s operating voltage.
5. Provision for transducer excitation includes a 6.2 V
reference output and an auxiliary amplifier which may be
configured for voltage or current output and signal
amplification.
6. The circuit configuration permits simple linearization of
bridge, RTD, and other transducer signals.
7. A monitored output is provided to drive an external pass
transistor. This feature off-loads power dissipation to
extend the temperature range of operation, enhance
reliability, and minimize self-heating errors.
8. Laser-wafer trimming results in low unadjusted errors and
affords precalibrated input and output spans.
9. Zero and span are independently adjustable and noninteractive
to accommodate transducers or user defined ranges.
10. Six precalibrated temperature ranges are available with a
100 RTD via pin strapping.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 617/329-4700
Fax: 617/326-8703


Analog Devices Semiconductor Electronic Components Datasheet

AD693 Datasheet

Loop-Powered 4.20 mA Sensor Transmitter

No Preview Available !

AD693 pdf
AD693–SPECIFICATIONS (@ +25؇C and VS = +24 V. Input Span = 30 mV or 60 mV. Output Span = 4–20 mA,
RL = 250 , VCM = 3.1 V, with external pass transistor unless otherwise noted.)
Model
Conditions
AD693AD/AQ/AE
Min Typ Max
Units
LOOP-POWERED OPERATION
TOTAL UNADJUSTED ERROR1, 2
TMIN to TMAX
100 RTD CALIBRATION ERROR3
LOOP POWERED OPERATION2
Zero Current Error4
vs. Temp.
Power Supply Rejection (RTI)
Common-Mode Input Range
Common-Mode Rejection (RTI)
Input Bias Current7
TMIN to TMAX
Input Offset Current7
Transconductance
Nominal
Unadjusted Error
vs. Common-Mode
Error vs. Temp.
Nonlinearity8
(See Figure 17)
Zero = 4 mA
Zero = 12 mA
Zero = 0 mA5
Zero = 4 mA
12 V VOP 36V6
0 V VCM 6.2 V
(See Figure 3)
0 V VCM 6.2 V
VSIG = 0
30 mV Input Span
60 mV Input Span
0 V VCM 6.2 V
30 mV Input Span
60 mV Input Span
30 mV Input Span
60 mV Input Span
± 0.25
± 0.4
± 0.5
؎0.5
؎0.75
± 2.0
% Full Scale
% Full Scale
°C
± 25 ؎80
± 40 ؎120
+7 +35 +100
±0.5 ±1.5
± 3.0 ؎5.6
µA
µA
µA
µA/°C
µV/V
0
+VOP – 4 V6
V
± 10 ؎30
µV/V
+5 +20
nA
+7 +25
nA
± 0.5 ؎3.0
nA
0.5333
0.2666
± 0.05 ؎0.2
A/V
A/V
%
± 0.03
± 0.05
± 20
± 0.01
± 0.02
± 0.04
± 0.06
± 50
؎0.05
؎0.07
%/V
%/V
ppm/°C
% of Span
% of Span
OPERATIONAL VOLTAGE RANGE
Operational Voltage, VOP6
Quiescent Current
Into Pin 9
+12 +36
+500 +700
V
µA
OUTPUT CURRENT LIMIT
+21 +25 +32
mA
COMPONENTS OF ERROR
SIGNAL AMPLIFIER9
Input Voltage Offset
vs. Temp
Power Supply Rejection
V/I CONVERTER9, 10
Zero Current Error
Power Supply Rejection
Transconductance
Nominal
Unadjusted Error
6.200 V REFERENCE9, 12
Output Voltage Tolerance
vs. Temp.
Line Regulation
Load Regulation11
Output Current13
12 V VOP 36 V6
0 V VCM 6.2 V
± 40 ؎200
±1.0 ±2.5
± 3.0 ؎5.6
Output Span = 4–20 mA
12 V VOP 36 V6
±30 ±80
±1.0 ±3.0
0.2666
±0.05 ±0.2
12 V VOP 36 V6
0 mA IREF 3 mA
Loop Powered, (Figure 10)
3-Wire Mode, (Figure 15)
± 3 ؎12
±20 ±50
± 200 ؎300
±0.3 ؎0.75
+3.0 +3.5
+5.0
µV
µV/°C
µV/V
µA
µA/V
A/V
%
mV
ppm/°C
µV/V
mV/mA
mA
mA
–2– REV. A


Part Number AD693
Description Loop-Powered 4.20 mA Sensor Transmitter
Maker Analog Devices
Total Page 12 Pages
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