wm8770 Wolfson Microelectronics plc, wm8770 Datasheet - Page 34

• Manufacturer Part Number: wm8770
• Description: 24-bit, 192khz 8-channel Codec With Volume Control
• Manufacturer: Wolfson Microelectronics plc

WM8770
w
01111
Digital
Attenuation
DACL4
10000
Digital
Attenuation
DACR4
10001
Master
Digital
Attenuation
(all channels)
REGISTER
ADDRESS
BIT
7:0
7:0
7:0
8
8
8
MASTDA[7:0]
RDA4[7:0]
LDA4[7:0]
UPDATE
UPDATE
UPDATE
Table 12 Digital Volume Control Attenuation Levels
The Digital volume control also incorporates a zero cross detect circuit which detects a transition
through the zero point before updating the digital volume control with the new volume. This is
enabled by control bit DZCEN.
LABEL
10011
DAC Control
REGISTER ADDRESS
L/RDAX[7:0]
FE(hex)
FF(hex)
00(hex)
01(hex)
:
:
:
Not latched
Not latched
Not latched
DEFAULT
11111111
11111111
11111111
(0dB)
(0dB)
(0dB)
BIT
Digital Attenuation data for Left channel DACL4 in 0.5dB steps. See
Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for Right channel DACR4 in 0.5dB steps.
See Table 12
Controls simultaneous update of all Attenuation Latches
Digital Attenuation data for all DAC channels in 0.5dB steps. See
Table 12
Controls simultaneous update of all Attenuation Latches
0
ATTENUATION LEVEL
DZCEN
LABEL
0: Store LDA4 in intermediate latch (no change to output)
1: Store LDA4 and update attenuation on all channels.
0: Store RDA4 in intermediate latch (no change to output)
1: Store RDA4 and update attenuation on all channels.
0: Store gain in intermediate latch (no change to output)
1: Store gain and update attenuation on all channels.
-∞ dB (mute)
-127.5dB
-0.5dB
0dB
:
:
:
DEFAULT
0
DESCRIPTION
DAC Digital Volume Zero Cross
Enable:
0: Zero cross detect disabled
1: Zero cross detect enabled
DESCRIPTION
PD Rev 4.2 March 2008
Production Data
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