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In order to improve audio performance, the following reference circuits are recommended. The audio signals have
to be layout according to differential signal layout rules as shown in following figures.
4.8.1 Speaker Interface Configuration
SIM808_Hardware Design_V1.00 2014.03.27
37
SPK1P
SPK1N
10pF
10pF
10pF
33pF
33pF
33pF
ESD
ANTI
ESD
ANTI
These components should
be placed to speaker as
close as possible
The lines in bold type should
be accorded to differential
signal layout rules
MODULE
Figure 32: Speaker reference circuit
Figure 33: Speaker with amplifier reference circuit
4.8.2 Microphone Interfaces Configuration
Figure 34 : Microphone reference circuit
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