OPA2111 Datasheet, PDF (13/13 Pages) Burr-Brown (TI) – Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER

1/2 OPA2111
E₁
A₁
1
–In
R₂
10kΩ
INA106
2
10kΩ
100kΩ
5
R₁
202Ω
R₂
10kΩ
1/2 OPA2111
A₂
E₂
+In
10kΩ
3
6
E_O
Output
100kΩ
A_V = 10
1
E_O = 10(1 + 2 R₂/R₁)(E₂ – E₁) = 1000(E₂ – E₁)
Using the INA106 for an output difference amplifier extends the input common-mode
range of an instrumentation amplifier to ±10V. A conventional IA with a unity-gain difference
amplifier has an input common-mode range limited to ±5V for an output swing of ±10V. This
is because a unity-gain difference amp needs ±5V at the input for 10V at the output,
allowing only 5V additional for common-mode.
FIGURE 13. Precision Instrumentation Amplifier.
The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.
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13
OPA2111