TDA7411 Datasheet, PDF (15/43 Pages) STMicroelectronics – ADVANCED CAR SIGNAL PROCESSOR

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
TDA7411
Speaker Coupling
In some applications additional signal manipulations are desired, for example surround-sound or more-
band-equalizing. For this purpose an AC-Coupling with four different AC-Coupling inputs is placed before
the speaker-attenuators.
The input-impedance of the AC-Inputs is always 50kΩ with exception of AC input ACin1, which has pro-
grammable input impedance. For ACin3 exists an internal mixing stage and an internal mono low pass
filter, which is available as input only for the speaker FreeL/R.
There are two possibilities for internal DC Coupling:
– main channel after the bass filter
– main channel after the middle filter (same as at ACout pin)
The I²C bus programming tables shows the possible speaker sources.
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