OPA4277-SP Datasheet, PDF (13/21 Pages) Texas Instruments – High-Precision Operational Amplifier

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8 Application and Implementation
OPA4277-SP
SBOS771 – DECEMBER 2016
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The OPA4277-SP is unity-gain stable and free from unexpected output phase reversal, making it easy to use in a
wide range of applications. Applications with noisy or high-impedance power supplies may require decoupling
capacitors close to the device pins. In most cases, 0.1-μF capacitors are adequate.
8.2 Typical Application
I_REG ∼ 1 mA
5V
Type J
V+
1/4
OPA4277-SP
R_F
10 kΩ
R
412 Ω ^RF
10 kΩ
50 Ω
1 kΩ
1/4
OPA4277-SP
V–
25 Ω
R_CM = 1250 Ω
12
V_LIN ¹
13 _VI+N ^IR1
4
R_G
14
I_R2
11
V_REG
10
V+
R_G
1250 Ω
XTR105 B ⁹
3 _RG
2 ^VI–N
I_RET
6
E
8
I_O
7
I_O
=
4
mA + (V_I+N
– V_I–N)
40
R_G
0.01 µF
(G = 1 + ^2RF = 50)
R
Copyright © 2016, Texas Instruments Incorporated
Figure 22. Thermocouple Low-Offset, Low-Drift Loop Measurement With Diode Cold Junction
Compensation
8.2.1 Design Requirements
For the thermocouple low-offset, low-drift loop measurement with diode cold junction compensation shown in
Figure 22, a gain of 50 is desired.
Copyright © 2016, Texas Instruments Incorporated
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