User's Manual

UMTS/HSPA Module Series
UC20 User Manual
UC20_Hardware_Design Confidential / Released 59 / 84
5.2. GNSS Antenna Interface
The following tables show the GNSS antenna pin definition and frequency specification.
Table 25: Pin Definition of GNSS Antenna
Pin Name
Pin No.
I/O
Description
Comment
ANT_GNSS
47
AI
GNSS antenna
50Ω impedance
Table 26: GNSS Frequency
Type
Frequency
Unit
GPS
1575.42±1.023
MHz
GLONASS
1597.5 ~ 1605.8
MHz
5.2.1. Reference Design for Passive Antenna
Passive
antenna
MAX2659
Module
ANT_GNSS
/SHDN
GND
RFIN
GND
RFOUT
VCC
VDD
MCU_GPIO
100pF
6.8nH
220nF
33pF
51K
NM
NM
56pF
D1
Figure 34: Reference Circuit of GNSS Passive Antenna