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WM8569
ADC MUTE MODES
Each ADC channel also has a mute control bit, which mutes the inputs to the ADC.
REGISTER ADDRESS BIT
LABEL
DEFAULT
DESCRIPTION
ADC Mute Select:
0001100
0
1
2
AMUTER
0
ADC Mute
0 : Normal operation
1: mute ADC right
AMUTEL
0
0
ADC Mute Select:
0 : Normal operation
1: mute ADC left
AMUTEALL
ADC Mute Select:
0 : Normal operation
1: mute both ADC channels
DE-EMPHASIS MODE
Each stereo DAC channel has an individual de-emphasis control bit:
REGISTER ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
0001001
6
DEEMPH
0
De-emphasis Channel Selection
Select:
DAC De-Emphahsis
Control
0 = Not de-emphasis
1 = De-emphasis
POWERDOWN MODE AND ADC/DAC DISABLE
The ADC and DAC may be powered down individually by setting the ADCPD and DACPD disable
bits. Setting ADCPD will disable the ADC and select a low power mode. The ADC digital filters will be
reset and will reinitialise when ADCPD is unset. Setting DACPD will disable the DAC and select a low
power mode.
REGISTER ADDRESS
0001010
BIT
LABEL
DEFAULT
DESCRIPTION
ADC Disable:
0
ADCPD
0
Powerdown Control
0: Active
1: Disable
1
DACPD
0
DAC Disable
MASTER POWERDOWN
This control bit powers down the references for the whole chip. Therefore for complete powerdown,
both the ADC and DACs should be powered down first before setting this bit.
REGISTER ADDRESS
0001010
BIT
LABEL
DEFAULT
DESCRIPTION
Master Power Down Bit:
0: Not powered down
1: Powered down
4
PWRDNALL
0
Interface Control
PP Rev 1.1 December 2005
25
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
