ref192gru Analog Devices, Inc., ref192gru Datasheet - Page 25

• Manufacturer Part Number: ref192gru
• Description: Precision Micropower, Low Dropout Voltage References
• Manufacturer: Analog Devices, Inc.

LOW POWER, STRAIN GAGE CIRCUIT
As shown in Figure 31, the REF19x family of references can be
used in conjunction with low supply voltage operational ampli-
fiers, such as the
gage circuit in which the REF195 is used as the core. Other
references can be easily accommodated by changing circuit
element values. The references play a dual role, first as the
voltage regulator to provide the supply voltage requirements of
the strain gage and the operational amplifiers, and second as a
precision voltage reference for the current source used to
stimulate the bridge. A distinct feature of the circuit is that it
can be remotely controlled on or off by digital means via
the SLEEP pin.
OP492
or the OP747, in a self-contained strain
Rev. J | Page 25 of 28
10μF
2.21kΩ
+
0.1μF
2
REF195
13
12
10
4
9
10kΩ
1%
Figure 31. Low Power, Strain Gage Circuit
OP492
OP492
–
+
–
+
1/4
1/4
10kΩ
10kΩ
6
57kΩ
1%
1%
1%
3
2
+
1μF
+
OP492
–
14
1/4
8
11
4
0.1μF
100Ω
20kΩ
20kΩ
1%
1%
1
20kΩ
1%
2N2222
0.01μF
6
5
500Ω
0.1%
–
OP492
+
1/4
REF19x Series
10μF
20kΩ
1%
7
OUTPUT