WM8772SEDSSLASHRV datasheet(62/73 Pages) WOLFSON

62 / 73 page

WM8772EFT – 32 LEAD TQFP

Production Data

PD Rev 4.2 October 2005

Setting the MUTEALL register bit will apply a 'soft' mute to the input of all the DAC digital filters:

BIT

LABEL

DEFAULT

DESCRIPTION

0000010

DAC Mute

MUTEALL

Soft Mute Select:

0 : Normal operation

1: Soft mute all channels

Refer to Figure 43 for the plot of application and release of soft mute.

Note that all other means of muting the DAC channels: setting the PL[3:0] bits to 0, setting the

PDWN bit or setting attenuation to 0 will cause much more abrupt muting of the output.

ADC MUTE MODES

Each ADC channel also has a mute control bit, which mutes the inputs to the ADC.

BIT

LABEL

DEFAULT

DESCRIPTION

AMUTER

ADC Mute Select:

0 : Normal operation

1: mute ADC right

AMUTEL

ADC Mute Select:

0 : Normal operation

1: mute ADC left

0001100

ADC Mute

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:

BIT

LABEL

DEFAULT

DESCRIPTION

0001001

DAC De-emphahsis

Control

[8:6]

DEEMPH

[1:0]

000

De-emphasis Channel Selection

Select:

DEEMPH

[1:0]

DAC CHANNEL 1

DAC CHANNEL 2

DAC CHANNEL 3

000

Not DE-EMPHASIS

001

DE-EMPHASIS

Not DE-EMPHASIS

010

Not DE-EMPHASIS

DE-EMPHASIS

Not DE-EMPHASIS

011

DE-EMPHASIS

Not DE-EMPHASIS

100

Not DE-EMPHASIS

DE-EMPHASIS

101

DE-EMPHASIS

Not DE-EMPHASIS

DE-EMPHASIS

110

Not DE-EMPHASIS

DE-EMPHASIS

Refer to Figure 7, Figure 8, Figure 9, Figure 10, Figure 11 and Figure 12 for details of the De-

Emphasis performance at different sample rates.

BIT

LABEL

DEFAULT

DESCRIPTION

0000010

DAC DEMP

DEEMP

ALL

DEMMP Select:

0 : Normal operation

1: De-emphasis all channels

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