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WM8948 Datasheet(PDF) 49 Page - Wolfson Microelectronics plc

Part # WM8948
Description  Stereo Low-Power CODEC with Video Buffer and Touch Panel Controller
PDF  189 Pages
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Manufacturer  WOLFSON [Wolfson Microelectronics plc]
Direct Link  http://www.wolfsonmicro.com
Logo WOLFSON - Wolfson Microelectronics plc

WM8948 Datasheet(HTML) 49 Page - Wolfson Microelectronics plc

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Production Data
WM8948
w
PD, May 2011, Rev 4.1
49
A digital soft-mute feature is provided in order to avoid sudden glitches in the analogue signal. When
DAC_VOL_RAMP is enabled, then all mute, un-mute or volume change commands are implemented
as a gradual volume change in the digital domain. The rate at which the volume ramps up is half of
the sample freq (fs/2). The DAC_VOL_RAMP register field is described in Table 24.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R21 (15h)
DAC Control 1
8
DAC_MUTEALL
1
DAC Digital Mute for All Channels:
0 = Disable Mute
1 = Enable Mute on all channels
R22 (16h)
DAC Control 2
4
DAC_VOL_RAMP
1
DAC Volume Ramp control
0 = Disabled
1 = Enabled
R23 (17h)
Left DAC
Digital Vol
12
DAC_VU
0
DAC Volume Update
Writing a 1 to this bit will cause
Left and Right DAC volume to be
updated simultaneously
8
DACL_MUTE
0
Left DAC Digital Mute
0 = Disable Mute
1 = Enable Mute
7:0
DACL_VOL [7:0]
1100_0000
(0dB)
Left DAC Digital Volume
0000_0000 = mute
0000_0001 = -71.625dB
0000_0010 = -71.250dB
…
1100_0000 = 0dB
...
1111_1111 = +23.625dB
(See Table 25 for volume range)
R24 (18h)
Right DAC
Digital Vol
12
DAC_VU
0
DAC Volume Update
Writing a 1 to this bit will cause
Left and Right DAC volume to be
updated simultaneously
8
DACR_MUTE
0
Right DAC Digital Mute
0 = Disable Mute
1 = Enable Mute
7:0
DACR_VOL [7:0]
1100_0000
(0dB)
Right DAC volume control
0000_0000 = mute
0000_0001 = -71.625dB
0000_0010 = -71.250dB
…
1100_0000 = 0dB
...
1111_1111 = +23.625dB
(See Table 25 for volume range)
Table 24 DAC Digital Volume Control



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