Product Preview

WM8569

w

PP Rev 1.1 December 2005

25

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

0

AMUTER

0

ADC Mute Select:

0 : Normal operation

1: mute ADC right

1

AMUTEL

0

ADC Mute Select:

0 : Normal operation

1: mute ADC left

0001100

ADC Mute

2

AMUTEALL

0

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

DAC De-Emphahsis

Control

6

DEEMPH

0

De-emphasis Channel Selection

Select:

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

BIT

LABEL

DEFAULT

DESCRIPTION

0

ADCPD

0

ADC Disable:

0: Active

1: Disable

0001010

Powerdown Control

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

BIT

LABEL

DEFAULT

DESCRIPTION

0001010

Interface Control

4

PWRDNALL

0

Master Power Down Bit:

0: Not powered down

1: Powered down