WM8766 Wolfson Microelectronics plc, WM8766 Datasheet - Page 26

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

WM8766
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DE-EMPHASIS MODE
Each stereo DAC channel has an individual de-emphasis control bit:
Refer to Figure 30 for details of the De-Emphasis performance at different sample rates.
POWERDOWN MODE AND DAC DISABLE
Setting the PDWN register bit immediately powers down the DACs on the WM8766, 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
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.
Table 14 De-emphasis Control
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
REGISTER ADDRESS
DAC De-Emphahsis
Powerdown Control
Powerdown Control
DAC DEEMPH
DEEMPH
0001001
0000010
0000010
0001010
Control
[1:0]
000
001
010
011
100
101
110
111
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
[8:6]
DAC CHANNEL 1
BIT
BIT
BIT
BIT
3:1
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
1
2
DACPD[2:0]
DEEMPALL
DEEMPH
PDWN
LABEL
LABEL
LABEL
LABEL
[1:0]
DEFAULT
DEFAULT
DEFAULT
DEFAULT
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
000
DAC CHANNEL 2
0
000
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
0
Power Down all DAC’s Select:
DAC Disable
De-emphasis Channel Selection
Select:
DEEMPH Select:
0: All DACs enabled
1: All DACs disabled
0 : Normal operation
1: De-emphasis all channels
DESCRIPTION
DESCRIPTION
DESCRIPTION
DESCRIPTION
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
Not DE-EMPHASIS
DAC CHANNEL 3
PD Rev 4.1 July 2005
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
DE-EMPHASIS
Production Data
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