CS43L42

18

DS481PP2

4.2 Channel A Analog Headphone Attenuation Control (address 02h) (HVOLA)

4.3 Channel B Analog Headphone Attenuation Control (address 03h) (hVOLB)

Default = 0 dB (No attenuation)

Function:

The Analog Headphone Attenuation Control operates independently from the Digital Volume Control. The

Analog Headphone Attenuation Control registers allow attenuation of the headphone output signal for

each channel in 1 dB increments from 0 to -25 dB. Attenuation settings are decoded using a 2’s comple-

ment code, as shown in Table 1. The volume changes are implemented as dictated by the Soft and Zero

Cross bits in the Power and Muting Control register. All volume settings greater than zero are interpreted

as zero.

Note:

The Analog Headphone Attenuation only affects the headphone outputs.

4.4 Channel A Digital Volume Control (address 04h) (DVOLA)

4.5 Channel B Digital Volume Control (address 05h) (DVOLB)

Default = 0 dB (No attenuation)

Function:

The Digital Volume Control registers allow independent control of the signal levels in 1 dB increments

from +18 to -96 dB. Volume settings are decoded using a 2’s complement code, as shown in Table 2.

The volume changes are implemented as dictated by the Soft and Zero Cross bits in the Power and Mut-

ing Control register. All volume settings less than -96 dB are equivalent to muting the channel via the

ATAPI bits (see Section 4.10.4).

Note:

The digital volume control affects both the line outputs and the headphone outputs. Setting this

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

7

654

32

10

HVOLx7

HVOLx6

HVOLx5

HVOLx4

HVOLx3

HVOLx2

HVOLx1

HVOLx0

0

000

00

00

Binary Code

Decimal Value

Volume Setting

00000000

0

0 dB

11110110

-10

-10 dB

11110001

-15

-15 dB

Table 1. Example Analog Volume Settings

7

654

32

10

DVOLx7

DVOLx6

DVOLx5

DVOLx4

DVOLx3

DVOLx2

DVOLx1

DVOLx0

0

000

00

00