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HUAWEI MG323 GSM M2M Module
Hardware Guide
Description of the Application Interfaces
Issue 04 (2011-08-22)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
26
Figure 3-13 External circuit for the microphone interface
Total Harmonic
Distortion
Internal Settings of the
Module
Supported Input from
Microphones
THD < 1%
F = 1kHz, pre-amp gain =
20dB, PGA gain = 14 dB
15.4 mV (typical)
THD < 5%
F = 1kHz, pre-amp gain =
0B, PGA gain = 0 dB
740 mV (typical)
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.