WM8569
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DAC OUTPUT PHASE
The DAC Phase control word determines whether the output of the DAC is non-inverted or inverted
REGISTER ADDRESS
0000011
BIT
LABEL
DEFAULT
DESCRIPTION
0 = non-inverted
1 = inverted
6
PHASE
0
DAC Phase
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 ZCD.
REGISTER ADDRESS BIT
LABEL
DEFAULT
DESCRIPTION
0001001
0
ZCD
0
DAC Digital Volume Zero Cross
Disable:
DAC Control
0: Zero cross detect enabled
1: Zero cross detect disabled
DAC MUTE MODES
The WM8569 has a mute for the DAC channels. Setting MUTE will apply a ‘soft’ mute to the input of
the digital filters.
REGISTER ADDRESS
0001001
BIT
LABEL
DEFAULT
DESCRIPTION
DAC Soft Mute Select
0 = Not mute
3
DMUTE
0
DAC Mute
1 = Mute
Refer to Figure 7 for the plot of application and release of soft mute.
Note that all other means of muting the DAC channels: setting the PL[3:0] bits to 0, setting the
PDWN bit or setting attenuation to 0 will cause much more abrupt muting of the output.
PP Rev 1.1 December 2005
24
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
