SE868SY-D Hardware Design Guide
1VV0301705 Rev. 5
Page 24 of 44
2021-12-15
Not Subject to NDA
7.
RF SECTION
The SE868SY-D module includes a state-of-the-art receiver capable of simultaneously
searching and tracking satellite signals from multiple satellite constellations. This multi-
GNSS receiver uses the entire spectrum of GNSS systems available: GPS, GLONASS,
BeiDou, Galileo, and QZSS.
GNSS RF Signal Pin-Out
Pin
Signal
I/O
Function
Type
8
RF_IN
I
L1-L5 RF signal input Analog RF
Table 21: GNSS RF Signal Pin-Out
RF Front End Design
The SE868SY-D Module embeds an internal LNA but, at the same time, the dynamics of
the device allow for higher external gain (See section 5.3.2 LNA Enable). Therefore, both
passive and active antenna (antenna with a built-in low noise amplifier) can be used. In
the latter case, the active antenna must be supplied with proper bias-tee circuit.
7.2.1.
Reference Design for Passive Antenna
Figure 6: Reference Design for Passive Antenna