WM1811A Datasheet, PDF (107/328 Pages) Wolfson Microelectronics plc – Multi-Channel Audio Hub CODEC for Smartphones

Production Data
WM1811A
SPEAKER MIXER CONTROL
The Speaker Mixer path select and volume controls are described in Table 59 for the Left Channel
(SPKMIXL) and Table 60 for the Right Channel (SPKMIXR).
Care should be taken when enabling more than one path to a speaker 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. Each Speaker Mixer output can also be muted using the SPKMIXL_VOL or
SPKMIXR_VOL register.
Note that the DAC input levels may also be controlled by the DAC Output Paths digital volume
controls (see “Digital Mixing”) and also (when applicable) by the Audio Interface Input Paths digital
volume controls (see “Digital Volume and Filter Control”).
When using the IN1LP or IN1RP signal paths to the speaker mixers, the buffered VMID reference
must be enabled, using the VMID_BUF_ENA register, as described in “Reference Voltages and
Master Bias”.
REGISTER
ADDRESS
R54 (0034h)
Speaker Mixer
R34 (0022h)
SPKMIXL
Attenuation
BIT
LABEL
7 MIXINL_TO_SPKMIXL
5 IN1LP_TO_SPKMIXL
3 MIXOUTL_TO_SPKMI
XL
1 DAC1L_TO_SPKMIXL
5 MIXINL_SPKMIXL_VO
L
4 IN1LP_SPKMIXL_VOL
3 MIXOUTL_SPKMIXL_
VOL
DEFAULT
DESCRIPTION
0
MIXINL (Left ADC bypass) to
SPKMIXL Mute
0 = Mute
1 = Un-mute
0
IN1LP to SPKMIXL Mute
0 = Mute
1 = Un-mute
Note that VMID_BUF_ENA must
be set when using the IN1LP input
to SPKMIXL.
0
Left Mixer Output to SPKMIXL
Mute
0 = Mute
1 = Un-mute
0
Left DAC to SPKMIXL Mute
0 = Mute
1 = Un-mute
0
MIXINL (Left ADC bypass) to
SPKMIXL Fine Volume Control
0 = 0dB
1 = -6dB
0
IN1LP to SPKMIXL Fine Volume
Control
0 = 0dB
1 = -6dB
0
Left Mixer Output to SPKMIXL Fine
Volume Control
0 = 0dB
1 = -6dB
2 DAC1L_SPKMIXL_VO
0
Left DAC to SPKMIXL Fine Volume
L
Control
0 = 0dB
1 = -6dB
1:0 SPKMIXL_VOL [1:0]
11
Left Speaker Mixer Volume Control
00 = 0dB
01 = Reserved
10 = Reserved
11 = Mute
Table 59 Left Speaker Mixer (SPKMIXL) Control
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PD, November 2013, Rev 4.1
107