Product Preview
WM8955L
LINE INPUTS AND OUTPUT MIXERS
The WM8955L provides the option to mix the DAC output signal with analogue line-in signals from
the LINEINL, LINEINR and MONOIN+ and MONOIN- pins. The level of the mixed-in signals can be
controlled with PGAs (Programmable Gain Amplifiers).
LINEINL, LINEINR, MONOIN+ and MONOIN- are high impedance, low capacitance AC coupled
analogue inputs. Theyare biased internallyto the reference voltage VREF. Whenever these inputs
are muted or the device placed into standbymode, the inputs remain biased to VREF using special
anti-thump circuitry. This reduces any audible clicks that may otherwise be heard when re-activating
the inputs.
REGISTER
ADDRESS
BIT
LABEL
LD2LO
DEFAULT
DESCRIPTION
Left DAC to Left Mixer
R34 (22h)
8
0
0
Left Mixer (1)
0 = Disable (Mute)
1 = Enable Path
7
LI2LO
LINEINL Signal to Left Mixer
0 = Disable (Mute)
1 = Enable Path
6:4
LI2LOVOL
101
LINEINL Signal to Left Mixer Volume
000 = +6dB
(-9dB)
… (3dB steps)
111 = -15dB
R35 (23h)
8
RD2LO
0
0
Right DAC to Left Mixer
0 = Disable (Mute)
1 = Enable Path
Left Mixer (2)
7
MI2LO
MONOIN Signal to Left Mixer
0 = Disable (Mute)
1 = Enable Path
6:4
MI2LOVOL
101
MONOIN Signal to Left Mixer Volume
000 = +6dB
(-9dB)
… (3dB steps)
111 = -15dB
Table 6 Left Output Mixer Control
Product Preview Rev 0.4 May2003
w
19
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
