TDA2320A 데이터 시트보기 (PDF) - STMicroelectronics
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TDA2320A Datasheet PDF : 12 Pages
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TDA2320A
Figure 21 : Fifth Order 3.4kHz Low-pass Butterworth Filter
Ri
Ci
C2
C4
R1
R2
3
1/2
1
R3
C1
TDA2320A
2-
R4
C3
5
1/2
7
TDA2320A
6-
1st order
2nd order
3rd order
For fc = 3.4kHz and Ri = R1 = R2 = R3 = R4 = 10kΩ, we obtain :
C1 =
1.354
.
1
R
.
1
2Π
fc
=
6.33nF
C3 =
0.309
.
1
R
.
1
2Π
fc
=
1.45nF
C1 =
0.421
.
1
R
.
1
2Π
fc
=
1.97nF
C4 =
3.325
.
1
R
.
1
2Π
fc
=
15.14nF
C2 =
1.753
.
1
R
.
1
2Π
fc
=
8.20nF
The attenuation of the filter is 30dB at 6.8kHz and
better than 60dB at 15kHz.
Figure 22 : Sixth-pole 355Hz Low-pass Filter (Chebychev type)
0.47µF
2-
1/2
TDA
2320A
3
56kΩ
1 10kΩ
10kΩ
6-
1/2
TDA
2320A
5
7 10kΩ
86.1nF
161nF
10kΩ
2-
1/2
TDA
2320A
3
1 10kΩ
16.3nF
220nF
10kΩ
6-
1/2
TDA
7
2320A
5
3.54nF
60nF
This is a 6-pole Chebychev type with ±0.25dB ripple
in the passband.A decoupling stage is used to avoid
the influence of the input impedance of the filter’s
characteristics.
The attenuation is about 55dB at 710Hz and
reaches 80dB at 1065Hz. The in band attenuation
is limited in practice to the ±0.25dB ripple and does
not exceed 1/2dB at 0.9fc.
10/12
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