OPA2111 Datasheet, PDF (11/13 Pages) Burr-Brown (TI) – Dual Low Noise Precision Difet OPERATIONAL AMPLIFIER

I_B = ±4pA max
1/2 OPA2111BM
3
Gain = 100
–In
2
1
CMRR ≈ 106dB
R_IN ≈ 10¹³â„¦
R_F
5kΩ
2
25kΩ
25kΩ
5
R_G
101Ω
R_F
5kΩ
25kΩ
3
6
Output
1/2 OPA2111BM
6
25kΩ
Burr-Brown
INA105
7
Differential
5
Amplifier
1
+In
Differential Voltage Gain = 1 + 2R_F/R_G
FIGURE 9. FET Input Instrumentation Amplifier.
10kΩ
Input
≈10pF
(1)
IN914
1/2
2
OPA2111AM
1
3
1MΩ
(1)
(1)
IN914
2N4117A
NOTE: (1) Reverse polarity for
negative peak detection.
1/2
6
OPA2111AM
7
5
Output
Droop ≈ 0.5mV/s
0.01µF
Polystyrene
FIGURE 10. Low-Droop Positive Peak Detector.
6.3MΩ
944kΩ
6.3MΩ
7.8MΩ
1.6MΩ
In
1.6MΩ
0.01µF
NPO
2
1
1/2 OPA2111
3
1.6MΩ
1.6MΩ
0.01µF
NPO
0.01µF
NPO
6
7
1/2 OPA2111
5
Out
0.01µF
NPO
NOTE: Lower value resistors will have lower
thermal noise but capacitors must
be scaled larger.
FIGURE 11. 10Hz Fourth-Order Butterworth Low-Pass Filter.
A_V = 2.6
f_O = 10Hz
–24dB/Octave
®
11
OPA2111