LS404 STMicroelectronics, LS404 Datasheet - Page 9

• Manufacturer Part Number: LS404
• Description: Low-noise bipolar op-amps
• Manufacturer: STMicroelectronics

Figure 16 : Multiple Feedback 8-pole Bandpass Filter
Figure 17 : Six pole 355Hz Low-pass Filter (chebychev type)
This is a - pole Chebychev type with ±0.25dB ripple in the passband. A decoupling stage is used to avoid
the influence of the input impedance on the filter’s characteristics. The attenuation is about 55dB at 710Hz
and reaches 80dB at 1065Hz. the in band attenuation is limited in practise to the ±0.25dB ripple and does
not exceed 0.5dB at 0.9fc.
Figure 18 : Subsonic Filter (Gv = 0dB)
Figure 19 : High Cut filter (Gv = 0dB)
0.47 F
56k
Vin
10k
C
10k
10k
C
22k
C1
10k
10k
C2
86.1nF
2
3
161nF
1
10k
Vout
Vout
10k
Fc (Hz)
10
15
3
5
Fc (Hz)
16.3nF
100
15
22
30
55
220nF
C1 (nF)
0.68
3.9
2.2
1.2
C ( F)
0.68
0.47
0.33
0.22
0.10
10k
C2 (nF)
6.8
4.7
2.2
1.5
10k
3.54nF
60nF
LS404
9/11