WM8352GEBSLASHV datasheet(76/336 Pages) WOLFSON

76 / 336 page

WM8352

Production Data

PD, February 2011, Rev 4.4

13.7.1

DAC PLAYBACK VOLUME CONTROL

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R50 (32h)

DAC Digital

Volume Left

DAC_VU

DAC left and DAC right volume do not

update until a 1 is written to either

DAC_VU register bit.

7:0

DACL_VOL

[7:0]

1100_0000

Left DAC digital volume control:

0000_0000 = Digital mute

0000_0001 = -71.625dB

0000_0010 = -71.25dB

… (0.375dB steps)

1100_000 = 0dB

R51 (33h)

DAC Digital

Volume Right

DAC_VU

DAC left and DAC right volume do not

update until a 1 is written to either

DAC_VU register bit.

7:0

DACR_VOL

[7:0]

1100_0000

Right DAC digital volume control:

0000_0000 = Digital mute

0000_0001 = -71.625dB

0000_0010 = -71.25dB

… (0.375dB steps)

1100_000 = 0dB

Table 32 DAC Volume Control

13.7.2

DAC SOFT MUTE AND SOFT UN-MUTE

The WM8352 has a soft mute function which, when enabled, gradually attenuates the volume of the

DAC output. When soft mute is disabled, the gain will either gradually ramp back up to the digital

gain setting, or return instantly to the digital gain setting, depending on the DAC_MUTEMODE

The DAC is soft-muted by default (DAC_MUTE = 1). To play back an audio signal, this function must

first be disabled by setting DAC_MUTE to 0.

Soft Mute Mode would typically be enabled (DAC_MUTEMODE = 1) when using DAC_MUTE during

playback of audio data so that when DAC_MUTE is subsequently disabled, the sudden volume

increase will not create pop noise by jumping immediately to the previous volume level (e.g.

resuming playback after pausing during a track).

Soft Mute Mode would typically be disabled (DAC_MUTEMODE = 0) when un-muting at the start of a

music file, in order that the first part of the track is not attenuated (e.g. when starting playback of a

new track, or resuming playback after pausing between tracks).

DAC muting and un-muting using

volume control bits DACL_VOL and

DACR_VOL.

DAC muting and un-muting using soft

mute bit DAC_MUTE. Soft un-mute

not enabled (DAC_MUTEMODE = 0).

DAC muting and un-muting using soft

mute bit DAC_MUTE. Soft un-mute

enabled (DAC_MUTEMODE = 1).

Figure 42 DAC Mute Control

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