WM8955_06 Datasheet, PDF (23/46 Pages) Wolfson Microelectronics plc – Stereo DAC For Portable Audio Applications

Production Data
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 by setting the DMEN bit, as shown below.
REGISTER
ADDRESS
R38 (26h)
Mono Mixer
(1)
BIT
LABEL
0
DMEN
DEFAULT
0
Table 10 Differential Mono Line-in Enable
DESCRIPTION
Differential mono line-in enable
0 = Single-ended line-in from MONOIN+
1 = Differential line-in
DEVICE WITH
DIFFERENTIAL
MONO OUTPUT
MONO OUT(-)
MONO OUT(+)
DAC
DAC
DMEN = 1
(ON) DIFF. IN
LEFT
LD2LO MIXER
LI2LO
RD2LO
MONO
MIXER
LD2MO
MI2LO
LI2MO
RD2MO
RIGHT
LD2RO MIXER
RI2MO
MI2RO
RD2RO
RI2RO
W
WM8955L
LOUT1VOL
LOUT1
MONOVOL
MONOOUT
ROUT1VOL
ROUT1
LOUT2
LOUT2VOL
-1 ROUT2
INV
ROUT2VOL
ROUT2
Loudspeaker
L - (-R)
= L+R
Figure 8 Differential Mono Line-in Configuration (DMEN=1)
DEVICE WITH
SINGLE-ENDED
MONO OUTPUT
MONO OUT
DAC
DAC
DMEN = 0
(OFF) DIFF. IN
LEFT
LD2LO MIXER
LI2LO
RD2LO
MONO
MIXER
LD2MO
MI2LO
LI2MO
RD2MO
RIGHT
LD2RO MIXER
RI2MO
MI2RO
RD2RO
RI2RO
W
WM8955L
LOUT1VOL
LOUT1
MONOVOL
MONOOUT
ROUT1VOL
ROUT1
LOUT2
LOUT2VOL
-1 ROUT2
INV
ROUT2VOL
ROUT2
Loudspeaker
L - (-R)
= L+R
Figure 9 Single-ended Mono Line-in Configuration (DMEN=0)
w
PD Rev 4.2 March 2006
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