Quectel M20

M20 Hardware Design
SPK2P
AGND
Differential layout
10pF
33pF
Close to speaker
GND
ESD
ANTI
Module
Figure 29: Speaker interface configuration of AOUT2
SPK2P
AGND
Differential layout
Amplifier
circuit
10pF
10pF
33pF
33pF
Close to speaker
GND
GND
ESD
ANTI
ESD
ANTI
Module
C2
C1
Figure 30: Speaker interface with amplifier in AOUT2
Note: The value of C1 and C2 depends on the input impedance of audio amplifier.
M20_HD_V1.01 - 52 -
Quectel