TDA7405 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
MFG CO.
'TDA7405' PDF : 57 Pages View PDF
TDA7405
5.6 SoftStep-Volume
When the volume-level is changed audible clicks could appear at the output. The root cause of those clicks
could either be a DC-Offset before the volume-stage or the sudden change of the envelope of the audiosignal.
With the SoftStep-feature both kinds of clicks could be reduced to a minimum and are no more audible. The
blend-time from one step to the next is programmable in four steps.
Figure 10. SoftStep-Timing
1dB
0.5dB
-0.5dB
SS Time
-1dB
Note: For steps more than 0.5dB the SoftStep mode should be deactivated because it could generate a hard 1dB step during the blend-time
5.7 Bass
There are four parameters programmable in the bass stage:
5.7.1 Attenuation
Figure 11 shows the attenuation as a function of frequency at a center frequency of 80Hz.
Figure 11. Bass Control @ fC = 80Hz, Q = 1
15.0
10.0
5.0
dB
0.0
-5.0
-10.0
-15.0
10.0
14/57
100.0
Hz
1.0K
10.0K
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