TDA7404D STMicroelectronics, TDA7404D Datasheet - Page 17

• Manufacturer Part Number: TDA7404D
• Description: IC PROCESSOR CAR SIGNAL SO-28
• Manufacturer: STMicroelectronics
• Type: Car Signal Processorr

Specifications of TDA7404D

• Applications: Automotive Systems
• Mounting Type: Surface Mount
• Package / Case: 28-SOIC (7.5mm Width)
• Dc: 0732
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

TDA7404
4.6
4.7
4.7.1
Soft-step 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 soft-step feature both kinds of clicks could be
reduced to a minimum and are no more audible. Four programmable soft step time from one
step to the next, are user selectable.
Figure 9.
1. For steps more than 1 dB the soft-step mode should be deactivated because it could generate a 1 dB error
Bass
There are three parameters programmable in the bass stage:
Attenuation
Figure 10
Figure 10. Bass control @ f
during the blend-time.
dB
shows the attenuation as a function of frequency at a center frequency of 80Hz.
-10.0
-15.0
15.0
10.0
-5.0
5.0
0.0
Soft-step timing
Vou t
10.0
-1dB
-2dB
2dB
1dB
C
SS Tim e
= 80 Hz, Q = 1
100.0
Hz
1.0K
Description of functionality
10.0K
Time
17/35