Production Data
WM8772EDS – 28 LEAD SSOP
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 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
MUTE FLAG OUTPUT
The DZFM control bits allow the selection of the six DAC channel zero flag bits for output on the
MUTEB pin. A ‘1’ on MUTE indicates 1024 consecutive zero input samples to the DAC channels
selected.
REGISTER ADDRESS BIT
LABEL
DEFAULT
DESCRIPTION
0001001
2:1 DZFM[1:0]
00
Selects the output 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
DAC MUTE MODES
The WM8772EDS 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
DMUTE [2:0]
000
DAC CHANNEL 1
Not MUTE
MUTE
DAC CHANNEL 2
DAC CHANNEL 3
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
Not MUTE
Not MUTE
MUTE
001
010
Not MUTE
MUTE
011
MUTE
100
Not MUTE
MUTE
Not MUTE
Not MUTE
MUTE
101
MUTE
110
Not MUTE
MUTE
PD Rev 4.2 October 2005
33
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
