WM8772 View Datasheet(PDF) - Cirrus Logic
Part Name
Description
MFG CO.
'WM8772' PDF : 73 Pages View PDF
Production Data
WM8772EFT – 32 LEAD TQFP
DAC OUTPUT PHASE
The DAC Phase control word determines whether the output of each DAC is non-inverted or inverted
REGISTER ADDRESS BIT
0000011
8:6
DAC Phase
LABEL
PHASE
[2:0]
DEFAULT
000
Bit
0
1
DESCRIPTION
DAC
Phase
DAC1L/R 1 = invert
DAC2L/R 1 = invert
2
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
0001001
0
DAC Control
LABEL
ZCD
DEFAULT
0
DESCRIPTION
DAC Digital Volume Zero Cross
Disable:
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
0001001
Zero Flag
BIT LABEL
2:1 DZFM[1:0]
DEFAULT
00
DESCRIPTION
Selects the output MUTE pin (A ‘1’
indicates 1024 consecutive zero
input samples on the DAC
channels selected.
00: All channels zero
01: Channel 1 zero
10: Channel 2 zero
11: Channel 3 zero
DAC MUTE MODES
The WM8772EFT 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 BIT
0001001
5:3
DAC Mute
LABEL
DMUTE
[2:0]
DEFAULT
DESCRIPTION
000
DAC Soft Mute Select
DMUTE [2:0]
000
001
010
011
100
101
110
DAC CHANNEL 1
Not MUTE
MUTE
Not MUTE
MUTE
Not MUTE
MUTE
Not MUTE
DAC CHANNEL 2
Not MUTE
Not MUTE
MUTE
MUTE
Not MUTE
Not MUTE
MUTE
DAC CHANNEL 3
Not MUTE
Not MUTE
Not MUTE
Not MUTE
MUTE
MUTE
MUTE
w
PD Rev 4.2 October 2005
61
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