wm8351 Wolfson Microelectronics plc, wm8351 Datasheet - Page 76

• Manufacturer Part Number: wm8351
• Description: Wolfson Audioplus? Stereo Codec With Power Management
• Manufacturer: Wolfson Microelectronics plc

WM8351
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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
Table 33 DAC Soft-Mute Control
13.7.3
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.
Table 34 DAC De-Emphasis Control
R48 (30h)
DAC Control
R58 (3Ah)
DAC Mute
R59 (3Bh)
DAC Mute
Volume
REGISTER
REGISTER
ADDRESS
ADDRESS
DAC DE-EMPHASIS
BIT
BIT
5:4
14
14
13
DEEMP [1:0]
DAC_MUTE
DAC_MUTEM
ODE
DAC_MUTER
ATE
LABEL
LABEL
DEFAULT
DEFAULT
00
1
0
0
De-Emphasis Control
11 = 48kHz sample rate
10 = 44.1kHz sample rate
01 = 32kHz sample rate
00 = No de-emphasis
DAC Mute
0 = disabled
1 = enabled
DAC Soft Mute Mode
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
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)
DESCRIPTION
DESCRIPTION
PD, June 2009, Rev 4.1
Production Data
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