OPA4277-EP Datasheet, PDF (13/20 Pages) Texas Instruments – OPA4277-EP High Precision Operational Amplifier

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OPA4277-EP
SBOS714 – NOVEMBER 2014
I_REG ∼ 1mA
5V
Type J
V+
1/2
OPA4277
R_F
10kΩ
R
412Ω ^RF
10kΩ
1kΩ
1/2
OPA4277
50Ω
V–
25Ω
R_CM = 1250Ω
12
V_LIN ¹
13 _VI+N ^IR1
4 _RG
14
I_R2
11
V_REG
10
V+
R_G
1250Ω
XTR105
B9
3 _RG
2 ^VI–N
I_RET
6
E
8
I_O
7
I_O
=
4mA +
(V_I+N
– V_I–N)
40
R_G
0.01µF
(G = 1 + ^2RF = 50)
R
Figure 25. Thermocouple Low Offset, Low Drift Loop Measurement With Diode Cold Junction
Compensation
8.2.3 Application Curve
At T_J = 25°C, V_S = ±15 V, and R_L = 2 kΩ, unless otherwise noted.
3
2
1
0
–1
–2
–3
0
15 30 45 60 75 90 105 120
Time from Power Supply Turn-On (s)
Figure 26. Warm-Up Offset Voltage Drift
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