page 31
It's hard to imagine modern multimedia devices
without high quality audio reproduction modules.
Sound and music are almost important as graphical
user interface. mikromedia
™
workStation v7 contains
two audio power amplifiers capable of delivering
675mW of continuous average power into an 8Ω load.
Amplifiers are connected each with one speaker, thus
with mikromedia stereo
VS1053
audio codec making
a stereo audio system. Speakers has maximum power
of 0.20W with 81dB maximum output sound level.
Left and right audio signals are brought to the board
directly from the mikromedia board (socket) via two
connection pins LOUT and ROUT (left and right stereo
signals). You can disconnect each off the amplifiers,
from the mikromedia socket
LOUT
and
ROUT
pins, by
placing
J8
and
J9
jumpers in OFF position, respectively.
After programming and testing Stereo system can be
implement in your final design.
other modules
Audio module
1
2
3
5
4
6
7
8
SHTDWN
BYPASS
IN+
IN-
Vo1
Vdd
GND
Vo2
U3
LM4864
R26
75K
C14
100nF
R24
22K
C16
100nF
VCC-3.3V
J8
1
2
SP1
LOUT
1
2
3
5
4
6
7
8
SHTDWN
BYPASS
IN+
IN-
Vo1
Vdd
GND
Vo2
U4
LM4864
E4
10uF
C19
100nF
E10
100uF/20V
C18
100nF
E9
100uF/20V
E3
10uF
R27
75K
C15
100nF
R25
22K
C17
100nF
VCC-3.3V
J9
1
2
SP2
ROUT
ON
OFF
ON
OFF
D
AT
A BUS
Figure 11-1: Audio module connection schematic.
