OPA2277-EP Datasheet, PDF (14/21 Pages) Texas Instruments – OPA2277-EP High-Precision, Low-Noise Operational Amplifier

OPA2277-EP
SBOS700 – DECEMBER 2014
www.ti.com
V+
R–∆R
V₁
Load
Cell
R+∆R
V₂
R+∆R
R–∆R
1/2
OPA2277
V–
V+
1/2
OPA2277
V_OUT
=
(V₁
–
V₂)(1
+
R₂
R₁
)
R₂
R₁
V–
R₂
R₁
A. For integrated solution see: INA126, INA2126 (dual), INA125 (on-board reference), or INA122 (single-supply).
Figure 24. Load Cell Amplifier
9.2.3 Application Curves
At T_J = 25°C, V_S = ±15 V, and R_L = 2 kΩ. Figure 25 shows Change in input bias current versus power supply
voltage. Curve shows normalized change in bias current with respect to V_S = ±10 V (+20 V). Typical IB may
range from –0.5 to 0.5 nA at V_S = ±10 V. Figure 26 shows change in input bias current versus common-mode
voltage. Curve shows normalized change in bias current with respect to V_CM = 0 V. Typical IB may range from
–0.5 to 0.5 nA at V_CM = 0 V.
2.0
1.5
1.0
0.5
0.0
–0.5
V_CM = 0 V
–1.0
–1.5
–2.0
0
5 10 15 20 25 30 35 40
Supply Voltage (V)
Figure 25. Change in Input Bias Current vs Power Supply
Voltage
2.0
1.5
1.0
V_S = ±5 V
0.5
0.0
–0.5
–1.0
V_S = ±15 V
–1.5
–2.0
–15
–10
–5
0
5
10
15
Common-Mode Voltage (V)
Figure 26. Change in Input Bias Current vs Common-Mode
Voltage
14
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