ISL55001 Intersil Corporation, ISL55001 Datasheet - Page 11

• Manufacturer Part Number: ISL55001
• Description: High Supply Voltage 220MHz Unity-Gain Stable Operational Amplifier
• Manufacturer: Intersil Corporation

Strain Gauge
The strain gauge is an ideal application to take advantage of
the moderate bandwidth and high accuracy of the ISL55001.
The operation of the circuit is very straightforward. As the
strain variable component resistor in the balanced bridge is
subjected to increasing strain, its resistance changes,
V
0V
5
+
-
1kΩ
VARIABLE SUBJECT
R
11
15
TO STRAIN
1kΩ
1kΩ
1kΩ
R
16
FIGURE 29. STRAIN GAUGE AMPLIFIER
R
R
17
18
ISL55001
1kΩ
1kΩ
1kΩ
resulting in an imbalance in the bridge. A voltage variation
from the referenced high accuracy source is generated and
translated to the difference amplifier through the buffer
stage. This voltage difference as a function of the strain is
converted into an output voltage.
R
F
+
-
+
-
V+
V-
+
-
1nF
1nF
C
V
5V
V
5V
C
12
2
4
6
R
1kΩ
L
V
(V1+V2+V3+V4)
OUT
March 9, 2006
FN6200.1