Hardware Guide

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FIBOCOM MC610 Series Hardware Guide 48/71
Figure 3-19 MIC reference circuit
HEADMIC_P/N also requires an external offset.
Figure 3-20 The headset MIC reference circuit
3.10.4 Preventing TDD and Other Noises
Handheld microphones and hands-free microphones are recommended to adopt built-in RF filter dual-
capacitance (such as 10 pF and 33 pF) electret microphones to filter out RF interference from the source