N1_Hardware_User_Guide
Copyright © Neoway Technology Co., Ltd
37
5 Audio Interface
N1provides a few groups of audio input/output interfaces to meet customer requirements in different
applications.
5.1 Audio Input
Table 5-1 lists the two groups of audio input pins.
Table 5-1
Audio input pins
Pin
Signal
I/O
Function
Remarks
148
MIC1_N
AI
Negative pin of MIC1 output
Main MIC
149
MIC1_P
AI
Positive pin of MIC1 output
Main MIC
143
MIC2_P
AI
Positive pin of MIC2 output
Sub-MIC
Figure 5-1 shows the differential connection of the peripheral. A bias circuit is embedded for the audio
input pins. TVS in Figure 5-1 can be replaced by AVLC5S02100 and SDV1005E5R5C800NPTF.
Figure 5-1
Reference design of MIC connection
N1
33 pF
MIC
33 pF
33 pF
MICN
MICP
TVS
TVS
1800
Ω
±25%
（
@100MHz
）
1800
Ω
±25%
（
@100MHz
）
5.2 Audio Output
N1provides a few groups of audio output interfaces, including speaker, receiver, and headphone.
Table 5-2 lists the audio output pins.
