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OPA277U Datasheet, PDF (10/26 Pages) Texas Instruments – High Precision OPERATIONAL AMPLIFIERS | |||
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V+
1/2
OPA2277
RââR
V1
Load
Cell
R+âR
V2
R+âR
RââR
Vâ
V+
1/2
OPA2277
Vâ
R2
R1
VOUT
=
(V1
â V2)(1 +
R2
R1
)
R2
R1
For integrated solution see: INA126, INA2126 (dual)
INA125 (on-board reference)
INA122 (single-supply)
FIGURE 3. Load Cell Amplifier.
Type J
IREG â¼ 1mA
5V
50â¦
V+
1/2
OPA2277
RF
10kâ¦
R
412â¦
RF
10kâ¦
1kâ¦
1/2
OPA2277
Vâ
25⦠RCM = 1250â¦
12
13
VLIN 1
VI+N IR1
14
IR2
11
VREG
10
V+
4
RG
RG
1250â¦
XTR105
B9
3 RG
2 VIâN
IRET
6
E
8
IO
7
IO = 4mA
+
(VI+N
â
VIâN)
40
RG
0.01µF
(G = 1 + 2RF = 50)
R
FIGURE 4. Thermocouple Low Offset, Low Drift Loop Measurement with Diode Cold Junction Compensation.
10
OPA277, OPA2277, OPA4277
www.ti.com
SBOS079A
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