WM8772EDS – 28 LEAD SSOP
Production Data
Setting the MUTEALL register bit will apply a 'soft' mute to the input of all the DAC digital filters:
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
Soft Mute Select:
0000010
0
MUTEALL
0
DAC Mute
0 : Normal operation
1: Soft mute all channels
Refer to Figure 19 for the plot of application and release of soft mute.
Note that all other means of muting the DAC channels: setting the PL[3:0] bits to 0, setting the
PDWN bit or setting attenuation to 0 will cause much more abrupt muting of the output.
ADC MUTE MODES
Each ADC channel also has a mute control bit, which mutes the inputs to the ADC.
REGISTER ADDRESS BIT
LABEL
DEFAULT
DESCRIPTION
ADC Mute Select:
0001100
0
1
2
AMUTER
0
ADC Mute
0 : Normal operation
1: mute ADC right
AMUTEL
0
0
ADC Mute Select:
0 : Normal operation
1: mute ADC left
AMUTEALL
ADC Mute Select:
0 : Normal operation
1: mute both ADC channels
DE-EMPHASIS MODE
Each stereo DAC channel has an individual de-emphasis control bit:
REGISTER ADDRESS
BIT
LABEL
DEEMPH
[1:0]
DEFAULT
DESCRIPTION
0001001
[8:6]
000
De-emphasis Channel Selection
Select:
DAC De-Emphahsis
Control
DEEMPH
[1:0]
000
DAC CHANNEL 1
DAC CHANNEL 2
DAC CHANNEL 3
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
001
010
Not DE-EMPHASIS
DE-EMPHASIS
011
DE-EMPHASIS
100
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
101
DE-EMPHASIS
110
Not DE-EMPHASIS
DE-EMPHASIS
Refer to Figure 7, Figure 8, Figure 9, Figure 10, Figure 11 and Figure 12 for details of the De-
Emphasis performance at different sample rates.
REGISTER ADDRESS
0000010
BIT
LABEL
DEEMP
ALL
DEFAULT
DESCRIPTION
DEMMP Select:
1
0
DAC DEMP
0 : Normal operation
1: De-emphasis all channels
PD Rev 4.2 October 2005
34
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
