TDA7462D データシートの表示（PDF） - STMicroelectronics

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TDA7462D

DUAL AUDIOPROCESSOR WITH COMPANDER AND SUBWOOFER OUTPUT

STMicroelectronics 

TDA7462

Compander Stage

To achieve the desired compression charac-

teristic like shown below the volume has to be

decreased by 4dB.

Figure 17. Compander Characteristics

dB 0

-10

-20

-30

-40

-8dB

2:1

-38dB

15dB

-50

-60

0

-10

-20

-30

-40

-50

-60

Input Level

dB

When the compander is working a volume word

coming from this stage is added to the I2C bus

volume word and the volume is changed with a

soft slope between adjacent steps. As mentioned

in the description of this stage it is not recom-

mended to change the volume during this slope.

The compander-hold bit (Bit 7 in the subaddress-

byte) is present to implement the volume change

more easily. The recommended sequence for

changing the volume level when compander fea-

ture is on is the following:

1. Set the compander-hold bit

2. Wait the actual SoftStep time

3. Change the volume

4. Reset the compander-hold bit

The SoftStep times are (in compander ON condi-

tion) automatically adapted to the attach time of

the Compander. In the following table the related

SoftStep times are shown:

Attack-Time

6ms

12ms

24ms

48ms

SoftStep Time

0.16ms

0.32ms

0.64ms

1.28ms

13/25

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