OPA2227-EP_13 Datasheet, PDF (13/23 Pages) Texas Instruments – HIGH PRECISION, LOW NOISE OPERATIONAL AMPLIFIER

OPA2227-EP
www.ti.com
SBOS594A – MARCH 2012 – REVISED NOVEMBER 2012
Figure 6 shows the 0.1-Hz to 10-Hz bandpass filter used to test the noise of the OPA2227. The filter circuit was
designed using Texas Instruments’ FilterPro software (available at www.ti.com). Figure 7 shows the configuration
of the OPA2227 for noise testing.
R₁
2MΩ
R₂
2MΩ
R₈
402kΩ
R₁₁
178kΩ
R₃
1kΩ
C₁
C₂
1µF
1µF
Input from
Device
Under
Test
R₄
9.09kΩ
R₆
R₇
40.2kΩ 97.6kΩ
U1
(OPA2227)
C₃
0.47µF
R₅
634kΩ
C₄
22nF
C₆
10nF
2
1
U2
3
R₉
178kΩ
(OPA2227)
R₁₀
226kΩ
6
7
U2
C₅
5
0.47µF
(OPA2227)
V_OUT
Figure 6. 0.1-Hz to 10-Hz Bandpass Filter Used to Test Wideband Noise of the OPA2227
22pF
100kΩ
10Ω
2
1
OPA2227
3
V_OUT
Device
Under
Test
Figure 7. Noise Test Circuit
Copyright © 2012, Texas Instruments Incorporated
Product Folder Links: OPA2227-EP
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