Production Data
WM8772EFT – 32 LEAD TQFP
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
0000000
7:0
LDA1[7:0]
11111111
(0dB)
Digital Attenuation data for Left channel DACL1 in 0.5dB steps. See
Table 11
Digital
Attenuation
DACL1
8
UPDATE
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
0000001
7:0
8
RDA1[6:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Right channel DACR1 in 0.5dB steps.
See Table 11
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.
0000100
7:0
8
LDA2[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Left channel DACL2 in 0.5dB steps. See
Table 11
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.
0000101
7:0
8
RDA2[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Right channel DACR2 in 0.5dB steps.
See Table 11
Digital
Attenuation
DACR2
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store RDA2 in intermediate latch (no change to output)
1: Store RDA2 and update attenuation on all channels.
0000110
7:0
8
LDA3[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Left channel DACL3 in 0.5dB steps. See
Table 11
Digital
Attenuation
DACL3
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store LDA3 in intermediate latch (no change to output)
1: Store LDA3 and update attenuation on all channels.
0000111
7:0
8
RDA3[7:0]
UPDATE
11111111
(0dB)
Digital Attenuation data for Right channel DACR3 in 0.5dB steps.
See Table 11
Digital
Attenuation
DACR3
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store RDA3 in intermediate latch (no change to output)
1: Store RDA3 and update attenuation on all channels.
0001000
7:0
8
MASTDA
[7:0]
11111111
(0dB)
Digital Attenuation data for all DAC channels in 0.5dB steps. See
Table 11
Master
Digital
Attenuation
UPDATE
Not latched
Controls simultaneous update of all Attenuation Latches
0: Store gain in intermediate latch (no change to output)
1: Store gain and update attenuation on all channels.
(all channels)
L/RDAX[7:0]
ATTENUATION LEVEL
00(hex)
-∞ dB (mute)
01(hex)
-127dB
:
:
:
:
:
:
FE(hex)
FF(hex)
-0.5dB
0dB
Table 22 Digital Volume Control Attenuation Levels
PD Rev 4.2 October 2005
67
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