CS43L43

18

DS479PP3

5.4 CHANNEL A DIGITAL VOLUME CONTROL (ADDRESS 04H) (DVOLA)

5.5 CHANNEL B DIGITAL VOLUME CONTROL (ADDRESS 05H) (DVOLB)

Default = 0 dB (No attenuation)

Function:

The Digital Volume Control allows the user to alter the signal level in 1 dB increments from +18 to -96 dB,

using the Digital Volume Control. Volume settings are decoded as shown in Table 8, using a 2’s comple-

ment code. The volume changes are implemented as dictated by the Soft and Zero Cross bits in the Pow-

er and Muting Control register. All volume settings less than - 96 dB are equivalent to muting the channel

via the ATAPI bits (See Section 5.10.4).

NOTE: Setting this register to values greater than +18 dB will cause distortion in the audio outputs.

5.6 TONE CONTROL (ADDRESS 06H)

Default = 0 dB (No Bass Boost)

Function:

The level of the shelving bass boost filter is set by Bass Boost Level. The level can be adjusted in 1 dB

increments from 0 to +12 dB of boost. Boost levels are decoded as shown in Table 9. Levels above

+12 dB are interpreted as +12 dB.

7

654

32

10

DVOLx7

DVOLx6

DVOLx5

DVOLx4

DVOLx3

DVOLx2

DVOLx1

DVOLx0

0

000

00

00

Binary Code

Decimal Value

Volume Setting

00001010

12

+12 dB

00000111

7

+7 dB

00000000

0

0 dB

11000100

-60

-60 dB

10100110

-90

-90 dB

Table 8. Example Digital Volume Settings

7

654

32

10

BB3

BB2

BB1

BB0

TB3

TB2

TB1

TB0

0

000

00

00

Binary Code

Decimal Value

Boost Setting

0000

0

0 dB

0010

2

+2 dB

0110

6

+6 dB

1001

9

+9 dB

1100

12

+12 dB

Table 9. Example Bass Boost Settings