Production Data
WM8580
DAC DIGITAL VOLUME CONTROL
The DAC volume may also be adjusted in the digital domain using independent digital attenuation
control registers
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R20
7:0
LDA1[7:0]
11111111
(0dB)
Digital Attenuation control for DAC1 Left Channel (DACL1) in 0.5dB
steps. See Table 23
Digital
Attenuation
DACL 1
8
UPDATE
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store LDA1 in intermediate latch (no change to output)
1 = Apply LDA1 and update attenuation on all channels
14h
R21
7:0
8
RDA1[6:0]
UPDATE
11111111
(0dB)
Digital Attenuation control for DAC1 Right Channel (DACR1) in
0.5dB steps. See Table 23
Digital
Attenuation
DACR 1
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store RDA1 in intermediate latch (no change to output)
1 = Apply RDA1 and update attenuation on all channels.
15h
R22
7:0
8
LDA2[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation control for DAC2 Left Channel (DACL2) in 0.5dB
steps. See Table 23
Digital
Attenuation
DACL 2
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store LDA2 in intermediate latch (no change to output)
1 = Apply LDA2 and update attenuation on all channels.
16h
R23
7:0
8
RDA2[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation control for DAC2 Right Channel (DACR2) in
0.5dB steps. See Table 23
Digital
Attenuation
DACR 2
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store RDA2 in intermediate latch (no change to output)
1 = Apply RDA2 and update attenuation on all channels.
17h
R24
7:0
8
LDA3[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation control for DAC3 Left Channel (DACL3) in 0.5dB
steps. See Table 23
Digital
Attenuation
DACL3
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store LDA3 in intermediate latch (no change to output)
1 = Apply LDA3 and update attenuation on all channels.
18h
R25
7:0
8
RDA3[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation control for DAC3 Right Channel (DACR3) in
0.5dB steps. See Table 23
Digital
Attenuation
DACR3
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store RDA3 in intermediate latch (no change to output)
1 = Apply RDA3 and update attenuation on all channels.
19h
R28
7:0 MASTDA[7:0]
11111111
(0dB)
Digital Attenuation control for all DAC channels in 0.5dB steps. See
Table 23
Master Digital
Attenuation
8
UPDATE
Not latched
Controls simultaneous update of all Attenuation Latches
0 = Store gain in intermediate latch (no change to output)
1 = Apply gain and update attenuation on all channels.
1Ch
Table 22 Digital Attenuation Registers
Note: The volume update circuit of the WM8580 has two sets of registers; LDAx and RDAx.
These can be accessed individually, or simultaneously by writing to MASTDA - Master
Digital Attenuation. Writing to MASTDA will overwrite the contents of LDAx and RDAx.
PD Rev 4.3 August 2007
33
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
