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FIBOCOM SU806 Series Hardware Guide
Page 54 of 86
5) Reduce noise and improve audio quality, the following approaches are recommended.
Keep audio PCB routing away from the antenna and high-frequency digital signal.
Reserve LC filter circuit in audio circuit to reduce EMI.
Audio routing needs to be masked.
3.19.2
Microphone Circuit Design
Module
MIC_M
MIC_P
33
pF
33
pF
100
pF
Figure 3-20 Microphone reference design
3.19.3
Earpiece Circuit Design
0R
33
pF
100
pF
0R
Module
EAR_M
EAR_P
33
pF
Figure 3-21 Earpiece reference design
