Speaker Interface Configuration; Microphone Interfaces Configuration - SimCom SIM808 Hardware Design

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

MODULE
4.8.2

Microphone Interfaces Configuration

SIM808_Hardware Design_V1.00
The lines in bold type should
be accorded to differential
signal layout rules
SPK1P
SPK1N
Figure 32: Speaker reference circuit
Figure 33: Speaker with amplifier reference circuit
Figure 34 : Microphone reference circuit
These components should
be placed to speaker as
close as possible
10pF 33pF
33pF
10pF
33pF
10pF
37
Smart Machine Smart Decision
ESD
ANTI
ESD
ANTI
2014.03.27