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HUAWEI MG323 GSM M2M Module
Hardware Guide
Figure 3-13 External circuit for the microphone interface
Total Harmonic
Distortion
THD < 1%
THD < 5%
The specifications listed in the preceding table are based on the ambient temperature
ranging from –30° C to + 75° C when the module is working.
It is recommended that ESD components be added to the external circuit of the audio
interface to protect the module.
Issue 04 (2011-08-22)
Internal Settings of the
Module
F = 1kHz, pre-amp gain =
20dB, PGA gain = 14 dB
F = 1kHz, pre-amp gain =
0B, PGA gain = 0 dB
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
Description of the Application Interfaces
Supported Input from
Microphones
15.4 mV (typical)
740 mV (typical)
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