TDA7402_00 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

TDA7402_00

CAR RADIO SIGNAL PROCESSOR

STMicroelectronics 

TDA7402

1.6 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 6. SoftStep-Timing

1dB

0.5dB

-0.5dB

-1dB

SS Time

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.

1.7 Bass

There are four parameters programmable in the bass stage:

1.7.1 Attenuation

Figure 7 shows the attenuation as a function of frequency at a center frequency of 80Hz.

Figure 7. Bass Control @ fC = 80Hz, Q = 1

1 5.0

1 0.0

5 .0

dB

0 .0

-5. 0

-1 0.0

-1 5.0

10 .0

10 0.0

Hz

1.0K

10 .0K

15/59

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