WM8746 Wolfson Microelectronics plc, WM8746 Datasheet - Page 18

• Manufacturer Part Number: WM8746
• Description: 24-bit, 192khz 6-channel Dac With Volume Control
• Manufacturer: Wolfson Microelectronics plc

WM8746
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POWERDOWN MODE
Setting the PWDN register bit immediately connects all outputs to V
mode. All trace of the previous input samples is removed, but all control register settings are
preserved. When PWDN is cleared again the first 16 input samples will be ignored as the FIR will
repeat it's power-on initialisation sequence.
ATTENUATOR CONTROL MODE
Setting the ATC register bit causes the left channel attenuation settings to be applied to both left and
right channels for all three pairs of DACs from the next audio input sample. No update to the
attenuation registers is required for ATC to take effect.
DAC OUTPUT CONTROL
The DAC output control word determines how the left and right inputs to the audio Interface are
applied to the left and right DACs:
Table 6 Input to Output Control
0000010
DAC Channel Control
0000010
DAC Channel Control
0000010
DAC Control
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
BIT
BIT
BIT
8:5
2
3
LABEL
PWDN
LABEL
LABEL
PL[3:0]
ATC
DEFAULT
DEFAULT
DEFAULT
1001
0
0
Power Down Mode Select:
Attenuator Control Mode:
PL[3:0]
0000
0001
0010
0011
0100
0101
0110
0111
1000
1001
1010
1011
1100
1101
1110
1111
0 : Normal Mode
1: Power Down Mode
0 : Right channels use Right
1:
attenuations
Right Channels use Left
Attenuations
CAP
DESCRIPTION
DESCRIPTION
DESCRIPTION
PD, October 2008, Rev 4.2
Left
Output
Mute
Left
Right
(L+R)/2
Mute
Left
Right
(L+R)/2
Mute
Left
Right
(L+R)/2
Mute
Left
Right
(L+R)/2
and selects a low power
Production Data
Right
Output
Mute
Mute
Mute
Mute
Left
Left
Left
Left
Right
Right
Right
Right
(L+R)/2
(L+R)/2
(L+R)/2
(L+R)/2
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