Design Guide - SimCom SIM5215 Hardware Design

3.4.2

Design Guide

There are three audio channels in SIM5215&SIM5216，including speaker output , receiver output and
microphone input.
SPEAKER circuit in SIM5215&SIM5216 is a Class-D amplifier, optional EMI filter is shown in the
following figure; these components (two ferrite beads and two capacitors) can reduce electromagnetic
interference. If used, they should be located beside SPK_P and SPK_N pins. Considerable current flows in
the channels, so wider PCB traces are recommended (~ 20 mils).
MODULE
SIM5215&SIM5216_Hardware Design_V2.02
Figure 22: Speaker interface configuration
The lines in bold type should
be accorded to differential
signal layout rules
EAR_P
EAR_N
Figure 23: Receiver interface configuration
32
Smart Machine Smart Decision
These components should
be placed to speaker as
close as possible
ESD
10pF 33pF
ANTI
33pF
10pF
ESD
33pF
10pF
ANTI
2012-08-31