TDA7406 Datasheet, PDF (23/64 Pages) STMicroelectronics – Car radio signal processor

TDA7406
Description of the audioprocessor part
4.6.2
Note:
Figure 12. Superposition of all EQ bands @ boost = 15dB
18
dB
16
14
12
10
8
6
4
2
0
10
100
1k
Hz 20k
DC-Mode
The filter stage 1 (62/100Hz) has a programmable +4dB DC-gain when the boost is set at
+15dB (See Figure 13).
Figure 13. EQ band1, normal- and DC-mode @ boost = 15 dB, f_Center = 62 Hz
16
dB
14
12
10
8
6
4
2
0
-1
1
10
100
1K
Hz 10K
The center frequency, Q, DC-mode and boost/cut can be set fully independently for each
filter.
4.7
Subwoofer Application
There is one separate subwoofer output. A low-pass filter stage at this output allows the
selection of three different frequencies: 80/120/160Hz. A high Pass Filter stage is present in
the main path with selectable 90/135/180/215Hz frequencies. Both filters, the low-pass as
well as the high-pass filter can be disabled and have butterworth characteristics so that their
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