OP297G(RevD) Просмотр технического описания (PDF) - Analog Devices
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OP297G Datasheet PDF : 16 Pages
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8/21/97 4:00 PM
PRECISION POSITIVE PEAK DETECTOR
In Figure 32, the CH must be of polystyrene, Teflon®*, or poly-
ethylene to minimize dielectric absorption and leakage. The
droop rate is determined by the size of CH and the bias current
of the OP297.
–
VIN
+
R1
10kΩ
R2
10kΩ
R3
10kΩ
2–
1/2
OP-297
3+
1
R5
100Ω
+15V
R4
10kΩ
8 +5
7
1/2
OP-297
–6
4
IOUT
±10mA
IOUT
=
VIN
R5
=
VIN
100Ω
=
10mA/V
–15V
Figure 31. Precision Current Pump
OP297
SIMPLE BRIDGE CONDITIONING AMPLIFIER
Figure 33 shows a simple bridge conditioning amplifier using
the OP297. The transfer function is:
V OUT
=
V
REF
R
∆R
+ ∆R
RF
R
The REF43 provides an accurate and stable reference voltage
for the bridge. To maintain the highest circuit accuracy, RF
should be 0.1% or better with a low temperature coefficient.
1kΩ
2–
1/2
1
VIN
1kΩ
OP-297
3+
1N4148
2N930
CH
RESET 1kΩ
+15V
0.1µF
6– 8
1/2
7
1kΩ
5
OP-297
+4
0.1µF
–15V
VOUT
Figure 32. Precision Positive Peak Detector
+5V
2
REF-43
4
6 2.5V
R
VREF
R
R
R + ∆R
RF
2–
1/2
1
3
OP-297
+
VOUT
+5V
6– 8
1/2
7
5
OP-297
+4
( ∆R
VOUT = VREF R + ∆R
RF
R
–5V
Figure 33. A Simple Bridge Conditioning Amplifier Using the OP297
*Teflon is a registered trademark of the Dupont Company
REV. D
–9–
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