WM8522
Production Data
DE-EMPHASIS MODE
Each stereo DAC channel has an individual de-emphasis control bit:
REGISTER ADDRESS
BIT
LABEL
DEEMPH
[1:0]
DEFAULT
DESCRIPTION
0001001
[8:6]
000
De-emphasis Channel Selection
Select:
DAC De-emphasis
Control
DEEMPH
[1:0]
000
DAC CHANNEL 1
DAC CHANNEL 2
DAC CHANNEL 3
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
001
010
Not DE-EMPHASIS
DE-EMPHASIS
011
DE-EMPHASIS
100
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
101
DE-EMPHASIS
110
Not DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
111
DE-EMPHASIS
DE-EMPHASIS
Table 14 De-emphasis Control
Refer to Figure 30 for details of the De-Emphasis performance at different sample rates.
REGISTER ADDRESS
0000010
BIT
LABEL
DEFAULT
DESCRIPTION
DEEMPH Select:
1
DEEMPALL
0
DAC DEEMPH
0 : Normal operation
1: De-emphasis all channels
POWERDOWN MODE AND DAC DISABLE
Setting the PDWN register bit immediately powers down the DACs on the WM8522, overriding the
DACD powerdown bits control bits. All trace of the previous input samples are removed, but all
control register settings are preserved. When PDWN is cleared the digital filters will be reinitialised
REGISTER ADDRESS
0000010
BIT
LABEL
DEFAULT
DESCRIPTION
Power Down all DAC’s Select:
0: All DACs enabled
2
PDWN
0
Powerdown Control
1: All DACs disabled
The DACs may also be powered down individually by setting the DACPD disable bit. Each Stereo
DAC channel has a separate disable DACPD[2:0]. Setting DACPD for a channel will disable the
DACs and select a low power mode.
REGISTER ADDRESS
0001010
BIT
LABEL
DEFAULT
DESCRIPTION
DAC Disable
3:1 DACPD[2:0]
000
Powerdown Control
PD Rev 4.0 July 2006
26
w
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
