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SC806Hardware User ManualPage45 of 70
195
MIC3_P
AI
Auxiliary MIC single-end input
210
MIC_BIAS1
AO
MIC bias voltage
Note:
1) The MIC bias circuit has been added to the SC806 and no external addition is required.
2) Add 100K resistor to ground for MIC2_P
3) The SPK is a configured class D amplifier and cannot be connected to an external amplifier. It is recommended
to connect 8 ohm speakers. There is a high requirement for sound amplitude of loud speaker, and the amplifier can
be connected to the headphone for output.
4) Reduce noise and improve audio quality. The following approaches are recommended:
Keep audio PCB route away from the antenna and high-frequency digital signal
Reserve LC filter circuit in audio circuit to prevent EMC
Audio route need to be masked
4
Antenna Interface
The SC806 supports 2/3/4G main antenna/diversity receiving antenna, WIFI/BT antenna, and GNSS antenna.
4.1
MAIN/DRXAntenna
The SC806 provides two 2G/3G/4G antenna interfaces. The ANT_MAIN is used to receive and transmit RF
signal, and the ANT_DRX is used for diversity reception.
Table26MAIN/DRX antenna interface definition
Pin No.
Pin Name
I/O
Description
Note
87
ANT_MAIN
I/O
2G/3G/4G antenna interface
131
ANT_DRX
AI
Diversity reception antenna
4.1.1
Operating bands
Table27Module operating band
Band
Mode
Tx (MHz)
Rx (MHz)
Band 2
LTE FDD/WCDMA/GSM
1850-1910
1930-1990
Band 4
LTE FDD/WCDMA
1710-1755
2110-2155