CS43L42 Cirrus Logic, CS43L42 Datasheet - Page 18

• Manufacturer Part Number: CS43L42
• Description: Stereo DAC
• Manufacturer: Cirrus Logic

4.2 Channel A Analog Headphone Attenuation Control (address 02h) (HVOLA)
4.3 Channel B Analog Headphone Attenuation Control (address 03h) (hVOLB)
4.4 Channel A Digital Volume Control (address 04h) (DVOLA)
4.5 Channel B Digital Volume Control (address 05h) (DVOLB)
18
HVOLx7
DVOLx7
Function:
Function:
7
0
7
0
Note:
Note:
Default = 0 dB (No attenuation)
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.
Default = 0 dB (No attenuation)
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).
Binary Code
HVOLx6
00000000
DVOLx6
11110110
11110001
The Analog Headphone Attenuation only affects the headphone outputs.
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.
6
0
6
0
Table 1. Example Analog Volume Settings
HVOLx5
DVOLx5
5
0
5
0
Decimal Value
-10
-15
0
HVOLx4
DVOLx4
4
0
4
0
HVOLx3
DVOLx3
Volume Setting
3
0
3
0
-10 dB
-15 dB
0 dB
HVOLx2
DVOLx2
2
0
2
0
HVOLx1
DVOLx1
1
0
1
0
CS43L42
DS481PP2
HVOLx0
DVOLx0
0
0
0
0