WM1811A datasheet(107/328 Pages) WOLFSON

107 / 328 page

Production Data

WM1811A

PD, November 2013, Rev 4.1

107

SPEAKER MIXER CONTROL

The Speaker Mixer path select and volume controls are described in Table 59 for the Left Channel

(SPKMIXL) and Table 60 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 -6dB control in each path to

facilitate this. Each Speaker Mixer output can also be muted using the SPKMIXL_VOL or

SPKMIXR_VOL register.

Note that the DAC input levels may also be controlled by the DAC Output Paths digital volume

controls (see “Digital Mixing”) and also (when applicable) by the Audio Interface Input Paths digital

volume controls (see “Digital Volume and Filter Control”).

When using the IN1LP or IN1RP signal paths to the speaker mixers, the buffered VMID reference

must be enabled, using the VMID_BUF_ENA register, as described in “Reference Voltages and

Master Bias”.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R54 (0034h)

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

Note that VMID_BUF_ENA must

be set when using the IN1LP input

to SPKMIXL.

MIXOUTL_TO_SPKMI

Left Mixer Output to SPKMIXL

Mute

0 = Mute

1 = Un-mute

DAC1L_TO_SPKMIXL

Left DAC to SPKMIXL Mute

0 = Mute

1 = Un-mute

R34 (0022h)

SPKMIXL

Attenuation

MIXINL_SPKMIXL_VO

MIXINL (Left ADC bypass) to

SPKMIXL Fine Volume Control

0 = 0dB

1 = -6dB

IN1LP_SPKMIXL_VOL

IN1LP to SPKMIXL Fine Volume

Control

0 = 0dB

1 = -6dB

MIXOUTL_SPKMIXL_

VOL

Left Mixer Output to SPKMIXL Fine

Volume Control

0 = 0dB

1 = -6dB

DAC1L_SPKMIXL_VO

Left DAC to SPKMIXL Fine Volume

Control

0 = 0dB

1 = -6dB

1:0

SPKMIXL_VOL [1:0]

Left Speaker Mixer Volume Control

00 = 0dB

01 = Reserved

10 = Reserved

11 = Mute

Table 59 Left Speaker Mixer (SPKMIXL) Control

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