Production Data
WM8352
The volume ramp rate during soft mute and un-mute is controlled by the DAC_MUTERATE bit.
Ramp rates of fs/32 and fs/2 are selectable as shown
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R58 (3Ah)
DAC Mute
14
DAC_MUTE
1
DAC Mute
0 = disabled
1 = enabled
R59 (3Bh)
14
DAC_MUTEM
ODE
0
DAC Soft Mute Mode
DAC Mute
Volume
0 = Disabling soft-mute
(DAC_MUTE=0) will cause the volume
to change immediately to the
DACL_VOL / DACR_VOL settings
1 = Disabling soft-mute
(DAC_MUTE=0) will cause the volume
to ramp up gradually to the DACL_VOL
/ DACR_VOL settings
13
DAC_MUTER
ATE
0
DAC Soft Mute Ramp Rate
0 = Fast ramp (24kHz at fs=48k,
providing maximum delay of 10.7ms)
1 = Slow ramp (1.5kHz at fs=48k,
providing maximum delay of 171ms)
Table 33 DAC Soft-Mute Control
13.7.3 DAC DE-EMPHASIS
Digital de-emphasis can be applied to the DAC playback data (e.g. when the data comes from a CD
with pre-emphasis used in the recording). De-emphasis filtering is available for sample rates of
48kHz, 44.1kHz and 32kHz.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R48 (30h)
5:4
DEEMP [1:0]
00
De-Emphasis Control
DAC Control
11 = 48kHz sample rate
10 = 44.1kHz sample rate
01 = 32kHz sample rate
00 = No de-emphasis
Table 34 DAC De-Emphasis Control
PD, February 2011, Rev 4.4
77
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
