Data Sheet

Smart Machine Smart Decision
SIM800F_Hardware Design_V1.00 35 2015-07-31
“AT+CMIC” is used to adjust the input gain level of microphone.
“AT+CLVL” is used to adjust the output gain level.
“AT+SIDET” is used to set the side-tone level.
For more details about AT command, please refer to document
[1]
and document
[5].
In order to improve audio performance, the following reference circuits are recommended. The audio trace should
be routed in differential and shielded by GND shown as below:
4.8.1 Speaker Reference Circuit
Figure 30: Speaker reference circuit
4.8.2 Microphone Reference Circuit
Figure 31 : Microphone reference circuit