WM8771
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DAC OUTPUT CONTROL
The DAC output control word determines how the left and right inputs to the audio Interface are
applied to the left and right DACs:
REGISTER ADDRESS
BIT
7:4
LABEL
PL[3:0]
DEFAULT
1001
DESCRIPTION
10011
PL[3:0]
Left
Right
Output
Output
DAC Control
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
Mute
Left
Mute
Mute
Mute
Mute
Left
Right
(L+R)/2
Mute
Left
Left
Right
(L+R)/2
Mute
Left
Left
Left
Right
Right
Right
Right
(L+R)/2
(L+R)/2
(L+R)/2
(L+R)/2
Right
(L+R)/2
Mute
Left
Right
(L+R)/2
DAC DIGITAL VOLUME CONTROL
The DAC volume may be adjusted in the digital domain using independent digital attenuation control
registers
REGISTER
ADDRESS
BIT
7:0
8
LABEL
LDA1[7:0]
UPDATE
DEFAULT
DESCRIPTION
01001
11111111
(0dB)
Digital Attenuation data for Left channel DACL1 in 0.5dB steps. See
Table 10
Digital
Attenuation
DACL1
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store LDA1 in intermediate latch (no change to output)
1: Store LDA1 and update attenuation on all channels
01010
7:0
8
RDA1[6:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Right channel DACR1 in 0.5dB steps.
See Table 10
Digital
Attenuation
DACR1
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store RDA1 in intermediate latch (no change to output)
1: Store RDA1 and update attenuation on all channels.
01011
7:0
8
LDA2[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Left channel DACL2 in 0.5dB steps. See
Table 10
Digital
Attenuation
DACL2
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store LDA2 in intermediate latch (no change to output)
1: Store LDA2 and update attenuation on all channels.
PP Rev 2.0 December 2001
28
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
