GSM/GPRS Module Series
M66 Hardware Design
M66_Hardware_Design Confidential / Released 43 / 80
SPK2P
AGND
Differential layout
10pF
0603
33pF
0603
Close to Speaker
GND
ESD
Module
22uF
Figure 25: Handset Interface Design for AOUT2
Module
SPK2P
AGND
Differential layout
Amplifier
circuit
10pF
0603
10pF
0603
33pF
0603
33pF
0603
Close to Speaker
GND
GND
ESD
ESD
C2
C1
Figure 26: Speaker Interface Design with an Amplifier for AOUT2
The suitable differential audio amplifier can be chosen from the Texas Instrument’s website
(http://www.ti.com/). There are also other excellent audio amplifier vendors in the market.
1.
The value of C1 and C2 here depends on the input impedance of audio amplifier.
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