OPA227_07 Datasheet, PDF (16/27 Pages) Texas Instruments – High Precision, Low Noise OPERATIONAL AMPLIFIERS

1.1kΩ
V_IN
1.1kΩ
2.2nF
1.65kΩ
33nF
OPA227
1.43kΩ
1.43kΩ
330pF
1.91kΩ
68nF
OPA227
f_N = 13.86kHz
Q = 1.186
f_N = 20.33kHz
Q = 4.519
FIGURE 14. Three-Pole, 20kHz Low Pass, 0.5dB Chebyshev Filter.
dc Gain = 1
2.21kΩ
V_OUT
10nF
f = 7.2kHz
0.1µF
100Ω
100kΩ
2
6
3 ^OPA227
Output
Dexter 1M
Thermopile
Detector
NOTE: Use metal film resistors
and plastic film capacitor. Circuit
must be well shielded to achieve
low noise.
Responsivity ≈ 2.5 x 10⁴V/W
Output Noise ≈ 30µVrms, 0.1Hz to 10Hz
20pF
TTL INPUT GAIN
“1”
+1
“0”
–1
9.76kΩ
500Ω
Input
10kΩ
2
D1
D2
4.99kΩ
S1
S2
6
3 ^OPA227 ₈
1
TTL DG188
In
4.75kΩ
1kΩ
Offset
Trim _+VCC
Balance
Trim
Output
4.75kΩ
FIGURE 15. Long-Wavelength Infrared Detector Amplifier.
FIGURE 16. High Performance Synchronous Demodulator.
OPA227, 2227, 4227
16
OPA228, 2228, 4228
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