WM8522 Datasheet, PDF (26/39 Pages) Wolfson Microelectronics plc – 24-bit, 192kHz 6-Channel DAC with 1.7Vrms Line Driver

WM8522
Pre-Production
DE-EMPHASIS MODE
Each stereo DAC channel has an individual de-emphasis control bit:
REGISTER ADDRESS BIT
0001001
[8:6]
DAC De-emphasis
Control
LABEL
DEEMPH
[1:0]
DEFAULT
000
DESCRIPTION
De-emphasis Channel Selection
Select:
DEEMPH
[1:0]
000
001
010
011
100
101
110
111
DAC CHANNEL 1
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
Table 14 De-emphasis Control
DAC CHANNEL 2
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
DAC CHANNEL 3
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
Refer to Figure 30 for details of the De-Emphasis performance at different sample rates.
REGISTER ADDRESS
0000010
DAC DEEMPH
BIT
LABEL
1 DEEMPALL
DEFAULT
0
DESCRIPTION
DEEMPH Select:
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 BIT
0000010
2
Powerdown Control
LABEL
PDWN
DEFAULT
0
DESCRIPTION
Power Down all DAC’s Select:
0: All DACs enabled
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
Powerdown Control
BIT LABEL DEFAULT
3:1 DACPD[2:0]
000
DESCRIPTION
DAC Disable
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PP Rev 3.1 May 2006
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