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OP290 Datenblatt(PDF) 10 Page - Analog Devices

Teilenummer OP290
Bauteilbeschribung  Precision, Low Power, Micropower Dual Operational Amplifier
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OP290 Datenblatt(HTML) 10 Page - Analog Devices

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OP290
Rev. C | Page 10 of 12
APPLICATIONS INFORMATION
TEMPERATURE TO 4 MA TO 20 mA TRANSMITTER
A simple temperature to 4 mA to 20 mA transmitter is shown in
Figure 20. After calibration, the transmitter is accurate to +0.5°C
over the −50°C to +150°C temperature range. The transmitter
operates from 8 V to 40 V with supply rejection better than
3 ppm/V. One half of the OP290 is used to buffer the VTEMP pin
while the other half regulates the output current to satisfy the
current summation at its noninverting input.
×
×
×
×
+
=
R10
R2
R7
R6
R2
V
R10
R2
R7
R
V
I
SET
TEMP
OUT
)
6
(
(1)
The change in output current with temperature is the derivative
of the following transfer function:
R10
R2
R7
(R6
T
V
T
I
TEMP
OUT
×
+
=
)
(2)
From Equation 1 and Equation 2, it can be seen that if the span
trim is adjusted before the zero trim, the two trims are not
interactive, which greatly simplifies the calibration procedure.
Calibration of the transmitter is simple. First, the slope of the
output current vs. temperature is calibrated by adjusting the
span trim, R7. A couple of iterations may be required to ensure
that the slope is correct.
Once the span trim has been completed, the zero trim can be
made. Remember that adjusting the offset trim does not affect
the gain. The offset trim can be set at any known temperature
by adjusting R5 until the output current equals
(
) mA
4
+


=
MIN
A
OPERATING
FS
OUT
T
T
T
I
I
Table 5 shows the values of R6 that are required for various
temperature ranges.
Table 5.
Temperature Range
R6 (k Ω)
0°C to +70°C
10
−40°C to +85°C
6.2
−50°C to +150°C
3
1/2
OP290GP
VIN
VOUT
VTEMP
GND
6
3
2
4
10k
R1
REF43
2N1711
V+
8V TO 40V
1N4002
SPAN TRIM
R10
100
1%, 1/2W
R9
100k
R8
1k
R3
100k
R5
5k
R2
1k
VTEMP
4
8
2
3
ZERO
TRIM
VSET
R4
20k
R6
3k
R7
5k
IOUT
RL
7
6
5
1
1/2
OP290GP
Figure 20. Temperature to 4 mA to 20 mA Transmitter


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