WM8993 datasheet(63/229 Pages) WOLFSON

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Production Data

WM8993

PD, November 2010, Rev 4.0

DAC SOFT MUTE AND SOFT UN-MUTE

The WM8993 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_UNMUTE_RAMP

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_UNMUTE_RAMP = 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_UNMUTE_RAMP = 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).

Figure 21 DAC Soft Mute Control

WM8993 Datasheet(PDF) 63 Page - Wolfson Microelectronics plc