WM8945ECSSLASHR datasheet(52/169 Pages) WOLFSON

52 / 169 page

WM8945

Production Data

PD, May 2011, Rev 4.1

To enable the output PGAs and mixers, the reference voltage VMID and the bias current must also be

enabled. See “Reference Voltages and Master Bias” for details of the associated controls VMID_SEL

and BIAS_ENA.

Note that the Line output, Speaker outputs and Speaker PGA mixers are all muted by default. The

required signal paths must be un-muted using the control bits described in the respective tables

below.

LINE OUTPUT MIXER CONTROL

The Line Output mixer controls are described in Table 30. These allow any of the DAC, Inverted DAC,

AUX1/2 and one of the ADC Bypass signals to be mixed. The output of the mixer can be muted using

the LINEL_MUTE bit.

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 DACL_TO_OUTL_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.

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”).

ADDRESS

BIT

LABEL

DEFAULT

DESCRIPTION

R42 (2Ah)

Output ctrl

LINEL_MUTE

LINEOUTL Output Mute

0 = Disable Mute

1 = Enable Mute

R49 (31h)

Line L mixer

control 1

BYPL_TO_OUTL

Left Input PGA (ADC bypass) to

Left Output Mixer select

0 = Disabled

1 = Enabled

MDACL_TO_

OUTL

Inverted Left DAC to Left Output

Mixer select

0 = Disabled

1 = Enabled

DACL_TO_OUTL

Left DAC to Left Output Mixer select

0 = Disabled

1 = Enabled

AUX2_TO_OUTL

AUX2 Audio Input to Left Output

Mixer select

0 = Disabled

1 = Enabled

AUX1_TO_OUTL

AUX1 Audio Input to Left Output

Mixer select

0 = Disabled

1 = Enabled

R51 (33h)

Line L mixer

control 2

BYPL_TO_OUTL

_ATTEN

Left Input PGA (ADC bypass) to

Left Output Mixer attenuation

0 = 0dB

1 = -6dB attenuation

DACL_TO_OUTL

_ATTEN

Left DAC to Left Output Mixer

attenuation

0 = 0dB

1 = -6dB attenuation

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