Sierra Wireless WISMO218 Manuale Utente
WA_DEV_W218_PTS_002
Rev 005
Page 60 of 109
Product Technical Specification &
Customer Design Guidelines
Figure 22. Audio Track Design
For differential connections, it is necessary to add a 2.2KΩ resistor from MICN to GND to have a
proper bias of the microphone. Refer to the following figure.
proper bias of the microphone. Refer to the following figure.
Figure 23. Differential Audio Connection
For single-ended connections, the negative pole of the microphone, MICN, should be connected to
GND. Refer to the following figure.
GND. Refer to the following figure.
Differential Audio line is
always in parallel