TDA7406T Datasheet, PDF (12/49 Pages) STMicroelectronics – CAR RADIO SIGNAL PROCESSOR

TDA7406T
Figure 4. 1st and 2nd Order Loudness @ Attn. = 15dB, fP=400Hz
0.0
-5.0
dB
-10.0
-15.0
-20.0
10.0
100.0
Hz
1.0K
10.0K
2.4 Soft Mute
The digitally controlled Soft Mute stage allows signal muting/demutingwith a programmable slope. The Mute
time is selectable among 4 values: 0.48, 0.96, 123 and 324ms. The mute process can either be activated by the
Soft Mute pin or via the I²C-bus. This slope is realized in a special S-shaped curve to mute slow in the critical
regions (see Figure 5).
For timing purposes the I²C-bus output register (Bit0 = SM read bit) is set to 1 from the start of muting until the
end of de-muting.
Figure 5. Soft Mute-Timing
Note: Please notice that a started Mute-action is always terminated and could not be interrupted by a change of the mute -signal.
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