Smart Module Series
SC690A_Series_Hardware_Design 78 / 105
5.2.1. Antenna Interface & Frequency Bands
The following table shows the pin definition, frequency, and performance of GNSS antenna interface.
Table 36: Pin Definition of GNSS Antenna Interface
Table 37: GNSS Frequency
5.2.2. Reference Design
5.2.2.1. Recommended Circuit for Passive Antenna
GNSS antenna interface supports passive ceramic antennas and other types of passive antennas. A
reference circuit design is given below.
Passive
Antenna
Module
ANT_GNSS
NM
C1
C2
R1
C4
NM
0R
Figure 31: Reference Circuit Design for GNSS Passive Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_GNSS
134
AI
GNSS antenna interface
50 Ω impedance
Type
Frequency
Unit
GPS
1575.42 ±1.023
MHz
GLONASS
1597.5
–1605.8
BeiDou
1561.098 ±2.046
Galileo
1573.5
–1577.5
NOTE