Quectel GSM Series - Page 13

GSM/GPRS Modules
GSM Module Audio Design Guide
GSM Module Audo Design Guide Confidential/Release 12 / 35
SPK2P
AGND
Differential layout
10pF
33pF
Close to speaker
GND
Module
22uF
ESD
Figure 4：SPK Reference Circuit for AOUT2
Module
SPK2P
AGND
Differential layout
Amplifier
circuit
10pF
10pF
33pF
33pF
Close to speaker
GND
GND
C2
C1
ESD
ESD
Figure 5：Receiver Reference Circuit with Audio Power Amplifier for AOUT2
For the value of C1 and C2, please refer to input impedance of audio power amplifier.
Note
Quectel
Confidential