WM8946ECSSLASHR datasheet(56/175 Pages) WOLFSON

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WM8946

Production Data

PD, July 2012, Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AUX2_TO_OUTR

AUX2 Audio Input to Right Output

Mixer select

0 = Disabled

1 = Enabled

AUX1_TO_OUTR

AUX1 Audio Input to Right Output

Mixer select

0 = Disabled

1 = Enabled

R52 (34h)

Line R mixer

control 2

BYPR_TO_OUTR

_ATTEN

Right Input PGA (ADC bypass) to

Right Output Mixer attenuation

0 = 0dB

1 = -6dB attenuation

DACL_TO_OUTR

_ATTEN

Left DAC to Right Output Mixer

attenuation

0 = 0dB

1 = -6dB attenuation

DACR_TO_OUTR

_ATTEN

Right DAC to Right Output Mixer

attenuation

0 = 0dB

1 = -6dB attenuation

AUX2_TO_OUTR

_ATTEN

AUX2 Audio Input to Right Output

Mixer attenuation

0 = 0dB

1 = -6dB attenuation

AUX1_TO_OUTR

_ATTEN

AUX1 Audio Input to Right Output

Mixer attenuation

0 = 0dB

1 = -6dB attenuation

Table 32 Right Output Mixer (MIXOUTR) Control

SPEAKER PGA MIXER CONTROL

The Speaker PGA mixer controls are described in Table 33 for the left channel (MIXSPKL) and Table

34 for the right channel (MIXSPKR). These allow any of the DACL/R, Inverted DACL/R, AUX1/2 and

one of the ADC Bypass signals to be mixed. The output of each PGA mixer can be muted also, using

the SPKL_MIX_MUTE and SPKR_MIX_MUTE bits.

Note that the output from the Speaker PGA mixer is also controlled by the Speaker PGA Volume

control and the Speaker Output control described in the following sections.

Care should be taken when enabling more than one path to the Speaker PGA mixers in order to avoid

clipping. The gain of each input path is adjustable using a selectable -6dB control in each path to

facilitate this.

Note that the attenuation control fields DACL_TO_PGAL_ATTEN and DACR_TO_PGAL_ATTEN

control both the DAC and the Inverted DAC mixer paths to the Left Speaker PGA mixer. The

equivalent applies to DACL_TO_PGAR_ATTEN and DACR_TO_PGAR_ATTEN also. Note that the

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

Converter (DAC)” for further details.

When the AUX1 or AUX2 pin is used as an audio input, that pin must be configured for audio using

the AUX1_AUDIO or AUX2_AUDIO register bits. These bits are defined in Table 2 (see “Analogue

Input Signal Path”).

WM8946ECS/R Datasheet(PDF) 56 Page - Wolfson Microelectronics plc

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