Shenzhen Neoway Technology Co., Ltd. Page 25 of 32
Figure 19 Reference design for MIC interface
Figure 20 Reference design for Ear interface
Figure 20 shows a reference design for earpiece interface. A 16Ω/32Ω earpiece can be directly
driven by the module. To pass the low frequency audio, use large capacitors for C1 and C2.
If an external amplifier is used for driving the speakers, 1uF~4.7uF coupling capacitors should be
used to block the DC voltage, as shown in Figure 21.
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