WM8900LGEFK/RV Wolfson Microelectronics, WM8900LGEFK/RV Datasheet - Page 47

• Manufacturer Part Number: WM8900LGEFK/RV
• Description: Audio CODECs Ultra Low Power Hi-Fi CODEC
• Manufacturer: Wolfson Microelectronics

Specifications of WM8900LGEFK/RV

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Production Data
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Table 30 DAC Soft-Mute Control
DAC MONO MIX
A DAC digital mono-mix mode can be enabled using the DAC_MONO register bit. This mono mix
will be output on the enabled DACs. To prevent clipping, a -6dB attenuation is automatically
applied to the mono mix.
Table 31 DAC Mono Mix
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. See "Digital Filter Characteristics" section for details of de-emphasis
filter characteristics.
Table 32 DAC De-Emphasis Control
DAC SLOPING STOPBAND FILTER
Two DAC filter types are available, selected by the register bit DAC_SB_FILT. When operating at
lower sample rates (e.g. during voice communication) it is recommended that the sloping stopband
filter type is selected (DAC_SB_FILT = 1) to reduce out-of-band noise which can be audible at low
R10 (0Ah)
DAC Control
R10 (0Ah)
DAC Control
R10 (0Ah)
DAC Control
REGISTER
ADDRESS
REGISTER
ADDRESS
REGISTER
ADDRESS
7
6
2
BIT
5:4
BIT
BIT
9
DAC_MUTERATE
DAC_MUTEMODE
DAC_MUTE
DEEMP
[1:0]
DAC_MONO
LABEL
LABEL
LABEL
00
DEFAULT
DEFAULT
DEFAULT
0
0
0
1
De-Emphasis Control
11 = 48kHz sample rate
10 = 44.1kHz sample rate
01 = 32kHz sample rate
00 = No de-emphasis
DAC Mono Mix
0 = Stereo
1 = Mono (Mono mix output on
enabled DACs)
DAC Soft Mute Ramp Rate
0 = Fast ramp (fs/2, maximum
ramp time is 10.7ms at fs=48k)
1 = Slow ramp (fs/32, maximum
ramp time is 171ms at fs=48k)
DAC Soft Mute and Un-mute Mode
0 = Disabling soft-mute
(DAC_MUTE=0) will cause the
DAC volume to change
immediately to DACL_VOL and
DACR_VOL settings or change to
digital mute level immediately
1 = Enabling soft-mute
(DAC_MUTE=0) will cause the
DAC volume to ramp up gradually
to the DACL_VOL and
DACR_VOL settings or gradually
ramp down to digital mute level
DAC Mute Control
0 = DAC Un-mute
1 = DAC Mute
PD, August 2008, Rev 4.0
DESCRIPTION
DESCRIPTION
DESCRIPTION
WM8900
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