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1.1.2 Schematic Guidelines
AGND is clear analog ground for audio, and all the audio signals should refer to it in
CPU board. What's more, one 0 ohm resistor for the return path connects the signal
GDN with the audio AGND in CPU board. Considering EMI, the bead and capacitors
are the recommendatory solution. For placement concern, EMI solution should be
close to connector.
CPU Board
R1
0 5%
0603
AGND
GND
Figure 1.1.1-1 Audio Application
CN
I/O Board
EMI Solution
MICR
B50
600_100MHz
0603
0.5A
MICL
B51
600_100MHz
0603
0.5A
LINR
B38
600_100MHz
0603
0.5A
LINL
B39
600_100MHz
0603
0.5A
LOUTR
B40
600_100MHz
0603
0.5A
LOUTL
B41
600_100MHz
0603
0.5A
AGND
C60
1000pF
50V
0402
AGND
AGND
C38
1000pF
50V
0402
AGND
AGND
C40
1000pF
50V
0402
AGND
AGND
8
MIC in
5
4
3
2
1
C209
<Characteristic>
1000pF
JACK5P-φ3.5
50V
0402
GND_Chasis
Line in
5
4
3
2
1
C39
1000pF
JACK5P-φ3.5
50V
0402
GND_Chasis
Line Out
5
4
3
2
1
C41
1000pF
50V
0402
GND_Chasis
CN26
Pink
JACK_5H
CN27
Blue
JACK_5H
Line in
CN28
Lime
JACK_5H
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