WM8944BECSSLASHR datasheet(54/165 Pages) CIRRUS

54 / 165 page

WM8944B

Rev 4.3

LINE OUTPUT MIXER CONTROL

The Line Output mixer (OUTMIX) controls are described in Table 32. 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 Line Output mixer. The output of the mixer can be muted using the LINE_MUTE bit.

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

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

Care should be taken when mixing more than one path to the Line Output 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_OUT_ATTEN controls the DAC and the Inverted DAC

mixer paths to the Line Output 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

R42 (2Ah)

Output ctrl

LINE_MUTE

LINEOUT Output Mute

0 = Disable Mute

1 = Enable Mute

R49 (31h)

Line mixer

control 1

AUXDIFF_TO_O

Differential AUX/IN1 to Line Output

Mixer select

0 = Disabled

1 = Enabled

IN1_TO_OUT

IN1 to Line Output Mixer select

0 = Disabled

1 = Enabled

BYP_TO_OUT

Input PGA (ADC bypass) to Line

Output Mixer select

0 = Disabled

1 = Enabled

MDAC_TO_OUT

Inverted DAC to Line Output Mixer

select

0 = Disabled

1 = Enabled

DAC_TO_OUT

DAC to Line Output Mixer select

0 = Disabled

1 = Enabled

AUX_TO_OUT

AUX to Line Output Mixer select

0 = Disabled

1 = Enabled

R51 (33h)

Line mixer

control 2

AUXDIFF_TO_O

UT_ATTEN

Differential AUX/IN1 to Line Output

Mixer attenuation

0 = 0dB

1 = -6dB attenuation

IN1_TO_OUT_AT

TEN

IN1 to Line Output Mixer attenuation

0 = 0dB

1 = -6dB attenuation

BYP_TO_OUT_A

TTEN

Input PGA (ADC bypass) to Line

Output Mixer attenuation

0 = 0dB

1 = -6dB attenuation

DAC_TO_OUT_A

TTEN

DAC to Line Output Mixer

attenuation

0 = 0dB

1 = -6dB attenuation

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