WM8959
Pre-Production
INPUT MIXER VOLUME CONTROL
The Input Mixer volume controls are described in Table 12 for the Left Channel and Table 13 for the
Right Channel. The Input PGA levels may be set to Mute, 0dB or 30dB boost. The other gain controls
provide adjustment from -12dB to +6dB in 3dB steps.
To prevent pop noise it is recommended that gain and mute controls for the input mixers are not
modified while the signal paths are active. If volume control is required on the input signal path it is
recommended that the input PGA volume controls are used instead of the input mixer gain registers.
REGISTER
ADDRESS
BIT
LABEL
DEFAULT
DESCRIPTION
R41 (29h)
8
L34MNB
0b
LIN34 PGA Output to INMIXL Mute
0 = Mute
1 = Un-Mute
7
L34MNBST
L12MNB
0b
0b
0b
LIN34 PGA Output to INMIXL Gain
0 = 0dB
1 = +30dB
5
LIN12 PGA Output to INMIXL Mute
0 = Mute
1 = Un-Mute
4
L12MNBST
LIN12 PGA Output to INMIXL Gain
0 = 0dB
1 = +30dB
R43 (2Bh)
8:6
LI2BVOL
[2:0]
000b
LIN2 Pin to INMIXL Gain and Mute
000 = Mute
(Mute)
001 = -12dB
010 = -9dB
011 = -6dB
100 = -3dB
101 = 0dB
110 = +3dB
111 = +6dB
5:3
LR4BVOL
[2:0]
000b
RXVOICE to AINLMUX Gain and Mute
000 = Mute
(Mute)
001 = -12dB
010 = -9dB
011 = -6dB
100 = -3dB
101 = 0dB
110 = +3dB
111 = +6dB
2:0
LL4BVOL
[2:0]
000b
RXVOICE to INMIXL Gain and Mute
000 = Mute
(Mute)
001 = -12dB
010 = -9dB
011 = -6dB
100 = -3dB
101 = 0dB
110 = +3dB
111 = +6dB
Note - LR4BVOL must be set to the same
value as LL4BVOL when AINLMODE=01.
Table 12 Left Input Mixer Volume Control
PP, May 2008, Rev 3.1
48
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
