WM8993 datasheet(74/229 Pages) WOLFSON

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WM8993

Production Data

PD, November 2010, Rev 4.0

SPEAKER MIXER CONTROL

The Speaker Mixer path select and volume controls are described in Table 45 for the Left Channel

(SPKMIXL) and Table 46 for the Right Channel (SPKMIXR).

Care should be taken when enabling more than one path to a speaker mixer in order to avoid

clipping. The gain of each input path is adjustable using a selectable -3dB control in each path to

facilitate this. Each Speaker Mixer output is also controlled by an additional independent volume

control. The DAC input levels may also be controlled by the DAC digital volume control - see “Digital

to Analogue Converter (DAC)” for further details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R54 (36h)

Speaker Mixer

MIXINL_TO_SPKMIXL

MIXINL (Left ADC bypass) to

SPKMIXL Mute

0 = Mute

1 = Un-mute

IN1LP_TO_SPKMIXL

IN1LP to SPKMIXL Mute

0 = Mute

1 = Un-mute

MIXOUTL_TO_SPKMIX

Left Mixer Output to SPKMIXL

Mute

0 = Mute

1 = Un-mute

DACL_TO_SPKMIXL

Left DAC to SPKMIXL Mute

0 = Mute

1 = Un-mute

R34 (22h)

SPKMIXL

Attenuation

MIXINL_SPKMIXL_VOL

MIXINL (Left ADC bypass) to

SPKMIXL Fine Volume Control

0 = 0dB

1 = -3dB

IN1LP_SPKMIXL_VOL

IN1LP to SPKMIXL Fine Volume

Control

0 = 0dB

1 = -3dB

MIXOUTL_SPKMIXL_V

Left Mixer Output to SPKMIXL Fine

Volume Control

0 = 0dB

1 = -3dB

DACL_SPKMIXL_VOL

Left DAC to SPKMIXL Fine

Volume Control

0 = 0dB

1 = -3dB

1:0

SPKMIXL_VOL [1:0]

11b

Left Speaker Mixer Volume Control

00 = 0dB

01 = -6dB

10 = -12dB

11 = mute

Table 45 Left Speaker Mixer (SPKMIXL) Control

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