User's Manual

LTE Module Series
EC25Hardware Design
EC25_Hardware_DesignConfidential / Released 64 / 90
5.2. GNSS Antenna Interface
The following tables show pin definition and frequency specification of GNSS antenna interface.
Table 27: Pin Definition of GNSS Antenna Interface
Pin Name Pin No. I/O Description Comment
ANT_GNSS 47 AI GNSS antenna 50ohmimpedance
Table 28: GNSS Frequency
Type Frequency Unit
GPS/Galileo/QZSS 1575.42±1.023 MHz
GLONASS 1597.5~1605.8 MHz
BeiDou 1561.098±2.046 MHz
A reference design of GNSS antenna is shown as below.
Figure 36: Reference Circuit of GNSS Antenna
1. An external LDO can be selected to supply power according to the active antenna requirement.
2. If the module is designed with a passive antenna, then the VDD circuit is not needed.
NOTES