OPA2227-EP Datasheet, PDF (14/23 Pages) Texas Instruments – HIGH PRECISION, LOW NOISE OPERATIONAL AMPLIFIER

OPA2227-EP
SBOS594 – MARCH 2012
1.1kΩ
2.2nF
1.1kΩ
V_IN
1.65kΩ
33nF
2
OPA2227 ¹
3
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1.43kΩ
1.43kΩ
330pF
1.91kΩ
68nF
6
OPA2227 ⁷
5
dc Gain = 1
2.21kΩ
V_OUT
10nF
f_N = 13.86kHz
Q = 1.186
f_N = 20.33kHz
Q = 4.519
Figure 8. Three-Pole, 20-kHz Low Pass, 0.5-dB Chebyshev Filter
f = 7.2kHz
0.1µF
100Ω
100kΩ
2
1
OPA2227
3
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
Figure 9. Long-Wavelength Infrared Detector Amplifier
14
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