WM8948ECSSLASHR datasheet(55/189 Pages) WOLFSON

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Production Data

WM8948

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 outputs, 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 for the Left Channel (MIXOUTL) and Table

31 for the Right Channel (MIXOUTR). 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 mixer can be muted also, using

the LINEL_MUTE and LINER_MUTE bits.

Care should be taken when mixing more than one path to the Line Output 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_OUTL_ATTEN and DACR_TO_OUTL_ATTEN

control both the DAC and the Inverted DAC mixer paths to the Left Channel output mixer. The

equivalent applies to DACL_TO_OUTR_ATTEN and DACR_TO_OUTR_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”).

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

MDACR_TO_

OUTL

Inverted Right DAC to Left Output

Mixer select

0 = Disabled

1 = Enabled

DACL_TO_OUTL

Left DAC to Left Output Mixer

select

0 = Disabled

1 = Enabled

DACR_TO_OUTL

Right 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

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