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OP290 Datenblatt(PDF) 8 Page - Analog Devices

Teilenummer OP290
Bauteilbeschribung  Precision, Low Power, Micropower Dual Operational Amplifier
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REV. B
OP290
–8–
From the formulas, 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 versus temperature is calibrated by adjusting the
span trim, R7. A couple of iterations may be required to be sure
the slope is correct.
Once the span trim has been completed, the zero trim can be made.
Remember that adjusting the offset trim will not affect the gain.
The offset trim can be set at any known temperature by adjusting
R5 until the output current equals:
I
I
T
TT
mA
OUT
FS
OPERATING
AMBIENT
MIN
= 

 ()
+
–4
Table I shows the values of R6 required for various tempera-
ture ranges.
VARIABLE SLEW RATE FILTER
The circuit shown in Figure 6 can be used to remove pulse noise
from an input signal without limiting the response rate to a genu-
ine signal. The nonlinear filter has use in applications where
the input signal of interest is known to have physical limitations.
An example of this is a transducer output where a change of
temperature or pressure cannot exceed a certain rate due to
physical limitations of the environment. The filter consists of a
comparator which drives an integrator. The comparator com-
pares the input voltage to the output voltage and forces the
integrator output to equal the input voltage. A1 acts as a com-
parator with its output high or low. Diodes D1 and D2 clamp
the voltage across R3 forcing a constant current to flow in or
out of C2. R3, C2, and A2 form an integrator with A2’s output
slewing at a maximum rate of:
Maximum slew rate
V
RC
V
RC
D
=≈
32
06
32
.
For an input voltage slewing at a rate under this maximum slew
rate, the output simply follows the input with A1 operating in its
linear region.
1/2
OP290GP
VIN
VOUT
VTEMP
GND
6
3
2
4
R1
10k
REF-43BZ
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
ZERO
TRIM
VSET
R4
20k
R6
3k
R7
5k
IOUT
RLOAD
7
6
5
1
1/2
OP290GP
Figure 5. Temperature to 4-20 mA Transmitter
Table I.
Temperature Range
R6 (k )
0
°C to +70°C10
–40
°C to +85°C
6.2
–55
°C to +150°C3


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