8
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.
Figure 1.1.1-1 Audio Application
I/O Board
EMI Solution
R1
0 5%
0603
GND
AGND
CN
CPU Board
AGND
Pink
CN26
JACK_5H
<Characteristic>
JACK5P-φ3.5
5
4
3
2
1
MICL
MICR
C60
1000pF
50V
0402
C209
1000pF
50V
0402
B50
600_100MHz
0.5A
0603
B51
600_100MHz
0.5A
0603
MIC in
AGND
AGND
GND_Chasis
Line in
LINL
LINR
C38
1000pF
50V
0402
C39
1000pF
50V
0402
B38
600_100MHz
0.5A
0603
B39
600_100MHz
0.5A
0603
Blue
CN27
JACK_5H
Line in
JACK5P-φ3.5
5
4
3
2
1
AGND
GND_Chasis
AGND
LOUTL
LOUTR
C40
1000pF
50V
0402
C41
1000pF
50V
0402
B40
600_100MHz
0.5A
0603
B41
600_100MHz
0.5A
0603
AGND
AGND
GND_Chasis
Line Out
Lime
CN28
JACK_5H
5
4
3
2
1