Preliminary Technical Data
WM8766
DAC OUTPUT PHASE
The DAC Phase control word determines whether the output of each DAC is non-inverted or inverted
REGISTER ADDRESS
0000011
BIT
LABEL
PHASE
[2:0]
DEFAULT
DESCRIPTION
8:6
000
Bit
0
DAC
Phase
DAC Phase
DAC1L/R 1 = invert
1
2
DAC2L/R 1 = invert
DAC3L/R 1 = invert
DIGITAL ZERO CROSS-DETECT
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.
REGISTER ADDRESS
0001001
BIT
LABEL
DEFAULT
DESCRIPTION
0
ZCD
0
DAC Digital Volume Zero Cross
Enable:
DAC Control
0: Zero cross detect enabled
1: Zero cross detect disabled
MUTE FLAG OUTPUT
The DZFM control bits allow the selection of the six DAC channel zero flag bits for output on the
MUTE pin. A ‘1’ on MUTE indicates 1024 consecutive zero input samples to the DAC channels
selected.
REGISTER ADDRESS
0001001
BIT
LABEL
DEFAULT
DESCRIPTION
2:1 DZFM[1:0]
00
Selects MUTE flag for output on the
MUTE pin (A ‘1’ indicates 1024
consecutive zero input samples on
the DAC channels selected.
Zero Flag
00: All channels zero
01: Channel 1 zero
10: Channel 2 zero
11: Channel 3 zero
DZFM[1:0]
MUTE
00
01
10
11
All channels zero
Channel 1 zero
Channel 2 zero
Channel 3 zero
DAC MUTE MODES
The WM8766 has individual mutes for each of the three DAC channels. Setting MUTE for a channel
will apply a ‘soft’ mute to the input of the digital filters of the channel muted.
REGISTER ADDRESS
0001001
BIT
LABEL
DMUTE
[2:0]
DEFAULT
DESCRIPTION
5:3
000
DAC Soft Mute Select
DAC Mute
PTD Rev 2.3 February 2004
21
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
