Rf Interface; Main Antenna Interface - YUGE CLM920 TD3 Usage Manual

CLM920 TD3 LTE Module Hardware Usage Guide
Signal
Pin Description
name
Analog
44 ADC1
converter interface 0
Analog
45 ADCO
converter interface 0

3.19 RF interface

CLM920 TD3 module provides three-way antenna interface, one main set antenna
interface, responsible for 4G, 3G, 2G signals of transceiver module, one-way diversity
antenna interface, responsible for receiving 4G, 3G signals, and signal degradation caused by
multi-path under high-speed movement The signal can be enhanced by adding a diversity
antenna, and a GNSS antenna interface is used for GPS, Beidou, GLONASS, and GALILEO
signal reception, and can provide a positioning solution for the user. Three-way antenna
interface impedance is 50 ohms.
Pin Signal name
49 ANT_MAIN
35 ANT_DIV
47 ANT_GNSS

3.19.1 Main antenna interface

The 49-pin of the CLM920 TD3 is the main set antenna interface. To facilitate the
debugging of the antenna, it is necessary to add a π-type matching circuit to the
motherboard, and take the 50-ohm impedance line. The recommended circuit is as follows：
Shanghai Yuge Information Technology co., LTD
para
meter
to digital
VIN
to digital
VIN
Table 3-28 Antenna interface pin definition
I/O Description
IO Main antenna interface
AI Diversity antenna interface
AI GNSS antenna interface
Figure 3-28 Main antenna matching circuit
Level value (V)
Min Typical Max
0.3 VBAT
0.3 VBAT
Remarks
50Ω characteristic impedance
50Ω characteristic impedance
50Ω characteristic impedance
Remarks
ADC resolution
15Bits
ADC resolution
15Bits
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