WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 22

• Manufacturer Part Number: WM8766
• Description: 24-bit, 192khz 6-channel Dac
• Manufacturer: Wolfson Microelectronics plc

WM8766
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DAC OUTPUT PHASE
The DAC phase control word determines whether the output of each DAC is non-inverted or inverted
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.
SOFTMUTE
The digital muting function used in Software and Hardware mode applies a softmute with the
operating characteristics shown in Figure 19.
Figure 19 Soft Mute Operation
When the softmute is applied the output of the device will decay towards V
approximately 64 input samples. When the mute is released, either manually or automatically by the
chip, the output will restart immediately from the current input sample.
ANALOGUE MUTE
Analogue mute can only be used in software mode and will cause the output of the selected DAC to
perform an analogue mute that clamps the output of the DAC to VMID. This function is dependent in
the IZD bit which is described in section INFINITE ZERO DETECT, later.
REGISTER ADDRESS
REGISTER ADDRESS
-0.5
-1.5
-2.5
1.5
0.5
-1
-2
1
0
DAC Control
0
DAC Phase
0000011
0001001
0.001
BIT
BIT
8:6
0
0.002
LABEL
PHASE
LABEL
ZCD
[2:0]
Time(s)
0.003
DEFAULT
DEFAULT
000
0
0.004
DAC Digital Volume Zero Cross
Enable:
Bit
0
1
2
0: Zero cross detect enabled
1: Zero cross detect disabled
DESCRIPTION
DESCRIPTION
0.005
DAC
DAC1L/R
DAC2L/R
DAC3L/R
MID
with a time constant of
PD Rev 4.1 July 2005
Production Data
Phase
1 = invert
1 = invert
1 = invert
0.006
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