TDA7462 datasheet(13/25 Pages) STMICROELECTRONICS

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Compander Stage

To achieve the desired compression charac-

teristic like shown below the volume has to be

decreased by 4dB.

When the compander is working a volume word

coming from this stage is added to the I

2C 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

SoftStep Time

6ms

0.16ms

12ms

0.32ms

24ms

0.64ms

48ms

1.28ms

-60

-50

-40

-30

-20

-10

-20

-30

-40

-50

-60

Input Level

-8dB

15dB

-38dB

2:1

Figure 17. Compander Characteristics

TDA7462

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