WM8944BECSSLASHR datasheet(55/165 Pages) CIRRUS

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WM8944B

Rev 4.3

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

AUX_TO_OUT_A

TTEN

AUX to Line Output Mixer

attenuation

0 = 0dB

1 = -6dB attenuation

Table 32 Line Output Mixer (MIXOUT) Control

SPEAKER PGA MIXER CONTROL

The Speaker PGA mixer (MIXSPK) controls are described in Table 33. These allow any of the DAC,

Inverted DAC, IN1, AUX and ADC Bypass signals to be mixed. A differential AUX/IN1 signal can also

be selected in the Speaker PGA mixer. The output of the Speaker PGA mixer can be muted using the

SPK_MIX_MUTE bit.

Note that, when selecting the differential AUX/IN1 signal as an input to the Speaker PGA mixer, the

IN1 pin provides the non-inverting path and the AUX pin provides the inverting signal path.

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 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.

Note that the attenuation control field DAC_TO_PGA_ATTEN controls the DAC and the Inverted DAC

mixer paths to the Speaker PGA mixer. Note that the DAC input level may also be controlled by the

DAC digital volume control -

see “Digital to Analogue Converter (DAC)” for further details.

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R3 (03h)

Power

Management

SPK_MIX_MUTE

Speaker PGA Mixer Mute

0 = Disable Mute

1 = Enable Mute

R43 (2Bh)

SPK mixer

control 1

AUXDIFF_TO_PG

Differential AUX/IN1 to Speaker

PGA Mixer select

0 = Disabled

1 = Enabled

IN1_TO_PGA

IN1 to Speaker PGA Mixer select

0 = Disabled

1 = Enabled

BYP_TO_PGA

Input PGA (ADC bypass) to

Speaker PGA Mixer select

0 = Disabled

1 = Enabled

MDAC_TO_PGA

Inverted DAC to Speaker PGA

Mixer select

0 = Disabled

1 = Enabled

DAC_TO_PGA

DAC to Speaker PGA Mixer select

0 = Disabled

1 = Enabled

AUX_TO_PGA

AUX to Speaker PGA Mixer select

0 = Disabled

1 = Enabled

R45 (2Dh)

SPK mixer

control 3

AUXDIFF_TO_PG

A_ATTEN

Differential AUX/IN1 to Speaker

PGA Mixer attenuation

0 = 0dB

1 = -6dB attenuation

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