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HUAWEI MG323 GSM M2M Module
Hardware Guide
Description of the Application Interfaces
Issue 06 (2013-06-13)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
28
33 pF capacitors are added for filtering radio frequency interference.
Figure 3-13 External circuit for the microphone interface
33 pF capacitors are added for filtering radio frequency interference.
It is recommended that ESD components be added to the external circuit of the audio
interface to protect the module.