Product Preview
WM8955L
DIFFERENTIAL MONO LINE-IN
The WM8955L can take either a single-ended or a differential mono signal and mix it into the
LOUT1/2 and ROUT1/2 outputs. In both cases, LINEINL and LINEINR still remain available as stereo
line-in. Differential mono input mode is enabled bysetting the DMEN bit, as shown below.
REGISTER
ADDRESS
BIT
LABEL
DMEN
DEFAULT
DESCRIPTION
R38 (26h)
0
0
Differential mono line-in enable
0 = Single-ended line-in from MONOIN+
1 = Differential line-in
Mono Mixer (1)
Table 9 Differential Mono Line-in Enable
MONO OUT(-)
DEVICE WITH
DIFFERENTIAL
MONO OUTPUT
MONO OUT(+)
DMEN = 1
(ON)
DIFF. IN
LI2LO
LEFT
MIXER
LD2LO
RD2LO
LD2MO
RD2MO
LD2RO
RD2RO
LOUT1
LOUT1VOL
MI2LO
LI2MO
DAC
DAC
MONO
MIXER
MONOOUT
MONOVOL
RI2MO
MI2RO
RIGHT
MIXER
ROUT1
LOUT2
ROUT1VOL
LOUT2VOL
RI2RO
Loudspeaker
L - (-R)
= L+R
W
WM8955L
ROUT2
INV
-1
ROUT2
ROUT2VOL
Figure 6 Differential Mono Line-in Configuration (DMEN=1)
DEVICE WITH
MONO OUT
SINGLE-ENDED
MONO OUTPUT
DMEN = 0
(OFF)
DIFF. IN
LI2LO
LEFT
MIXER
LD2LO
RD2LO
LD2MO
RD2MO
LD2RO
RD2RO
LOUT1
LOUT1VOL
MONOVOL
MI2LO
LI2MO
DAC
DAC
MONO
MIXER
MONOOUT
RI2MO
MI2RO
RIGHT
MIXER
ROUT1
LOUT2
ROUT1VOL
LOUT2VOL
RI2RO
Loudspeaker
L - (-R)
= L+R
W
WM8955L
ROUT2
INV
-1
ROUT2
ROUT2VOL
Figure 7 Single-ended Mono Line-in Configuration (DMEN=0)
Product Preview Rev 0.4 May2003
21
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WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
