TDA7402 Datasheet, PDF (18/59 Pages) STMicroelectronics – CARRADIO SIGNAL PROCESSOR

TDA7402
1.8.2 Center Frequency
Figure 12 shows the four possible center frequencies 10k, 12.5k, 15k and 17.5kHz.
Figure 12. Treble Center Frequencies @ Gain = 14dB
15.0
12.5
10.0
7.5
5.0
2.5
0.0
10.0
100.0
1.0K
10.0K
1.9 Subwoofer Application
Figure 13. Subwoofer Application with LPF 80/120/160Hz and HPF 90/135/180Hz
0.0
-10.0
-20.0
dB
-30.0
-40.0
-50.0
10.0
100.0
1.0K
Hz
10.0K
Both filters, the lowpass- as well as the highpass-filter, have butterworth characteristic so that their cut-off fre-
quencies are not equal but shifted by the factor 1.125 to get a flat frequency response.
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