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OPA2277-EP Datasheet, PDF (12/21 Pages) Texas Instruments – OPA2277-EP High-Precision, Low-Noise Operational Amplifier
OPA2277-EP
SBOS700 – DECEMBER 2014
9 Application and Implementation
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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.
9.1 Application Information
The OPA2277 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.
9.2 Typical Application
IREG ∼ 1mA
5V
Type J
V+
1/2
OPA2277
RF
10kΩ
R
412Ω RF
10kΩ
1kΩ
1/2
OPA2277
50Ω
V–
25Ω
RCM = 1250Ω
12
VLIN 1
13 VI+N IR1
4
RG
14
IR2
11
VREG
10
V+
RG
1250Ω
XTR105
B9
3 RG
2 VI–N
IRET
6
E
8
IO
7
IO
=
4mA +
(VI+N
– VI–N)
40
RG
0.01μF
(G = 1 + 2RF = 50)
R
Figure 21. Thermocouple Low-Offset, Low-Drift Loop Measurement With Diode Cold Junction
Compensation
9.2.1 Design Requirements
For the thermocouple low-offset, low-drift loop measurement with diode cold junction compensation (see
Figure 21), Table 1 lists the design parameters needed with gain = 50.
G 1  2RF 50
R
(1)
Table 1. Design Parameters
DESIGN PARAMETER
RF
R
EXAMPLE VALUE
10 kΩ
412 Ω
12
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