WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 29

• Manufacturer Part Number: WM8766
• Description: 24-bit, 192khz 6-channel Dac
• Manufacturer: Wolfson Microelectronics plc

Production Data
Note:
When MCLK is removed, digital volume settings are re-set to default (0dB). When MCLK is re-applied, the user
must write the desired volume level to the volume control registers.
w
(all channels)
Attenuation
Attenuation
Attenuation
Attenuation
Attenuation
Attenuation
Attenuation
REGISTER
ADDRESS
0000000
0000001
0000100
0000101
0000110
0000111
0001000
DACR1
DACR2
DACR3
DACL1
DACL2
DACL3
Master
Digital
Digital
Digital
Digital
Digital
Digital
Digital
BIT
7:0
7:0
7:0
7:0
7:0
7:0
7:0
8
8
8
8
8
8
8
RDA1[6:0]
RDA2[7:0]
RDA3[7:0]
LDA1[7:0]
LDA2[7:0]
LDA3[7:0]
MASTDA
UPDATE
UPDATE
UPDATE
UPDATE
UPDATE
UPDATE
UPDATE
DAC DIGITAL VOLUME CONTROL
The DAC volume may also be adjusted in the digital domain using independent digital attenuation
control registers
Table 16 Digital Volume Control Attenuation Levels
LABEL
[7:0]
L/RDAX[7:0]
FE(hex)
00(hex)
01(hex)
FF(hex)
Not latched
Not latched
Not latched
Not latched
Not latched
Not latched
Not latched
:
:
:
DEFAULT
11111111
11111111
11111111
11111111
11111111
11111111
11111111
(0dB)
(0dB)
(0dB)
(0dB)
(0dB)
(0dB)
(0dB)
Digital Attenuation data for Left channel DACL1 in 0.5dB steps. See
Table 16
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR1 in 0.5dB steps.
See Table 16.
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Left channel DACL2 in 0.5dB steps. See
Table 16
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR2 in 0.5dB steps.
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Left channel DACL3 in 0.5dB steps. See
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR3 in 0.5dB steps.
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for all DAC channels in 0.5dB steps. See
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.
See Table 16
0: Store RDA2 in intermediate latch (no change to output)
1: Store RDA2 and update attenuation on all channels.
Table 16
0: Store LDA3 in intermediate latch (no change to output)
1: Store LDA3 and update attenuation on all channels.
See Table 16
0: Store RDA3 in intermediate latch (no change to output)
1: Store RDA3 and update attenuation on all channels.
Table 16
0: Store gain in intermediate latch (no change to output)
1: Store gain and update attenuation on all channels.
0: Store LDA1 in intermediate latch (no change to output)
1: Store LDA1 and update attenuation on all channels
ATTENUATION LEVEL
0: Store RDA1 in intermediate latch (no change to output)
1: Store RDA1 and update attenuation on all channels.
- dB (mute)
-127dB
-0.5dB
0dB
:
:
:
DESCRIPTION
PD Rev 4.1 July 2005
WM8766
29