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FIBOCOM SU806 Series Hardware Guide
Page 51 of 79
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