Quectel Smart EVB G2 User Manual

Smart LTE Module Series
Smart EVB G2 User Guide
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Audio Interfaces 4.7.
Smart EVB G2 provides three analog audio outputs including one mono loudspeaker, one mono
earphone, and one stereo headset. The Smart EVB G2 also provides three analog audio inputs including
two single-ended and one differential microphone inputs. One single-ended microphone input is used for
headset interface. One single-ended and one differential microphone inputs are used for microphone
interfaces.
4.7.1. Loudspeaker Interface
Smart EVB G2 provides one loudspeaker interface and the loudspeaker is soldered onto the Smart EVB
G2 via test points TP1201 and TP1202. The following figure shows a reference circuit design for
loudspeaker interface.
SPK_P
SPK_N
1.0nF
Close to speaker
ESD
ESD
FB
FB
Smart-EVB-G2
1.0nF
J1201
Figure 26: Reference Circuit Design for Loudspeaker Interface
4.7.2. Headset Interface
The following figure shows a reference circuit design for headset interface.
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Quectel Smart EVB G2 Specifications

General

Brand	Quectel
Model	Smart EVB G2
Category	Motherboard
Language	English