CEM600 EVDO Mini PCIE Module Hardware User Guide
Shang Hai YUGE Information Technology co., LTD
Page 19 of 25
41
VCC_3V3
power input
3.3V
3.3V main power supply
52
VCC_3V3
power input
3.3V
3.3V main power supply
GND
Ground
The CEM600 module receives a 3.3V power supply from external sources (
±
9% accuracy).
The maximum average power consumption of the module is about 700mA. It is recommended
to use an LDO or switching power supply of 1.5A or higher. In order to maintain the
instantaneous voltage stability during operation, it is recommended to add a large storage
capacitor, such as 220uF tantalum capacitor, to the power port of the motherboard.
5.8 Antenna socket interface
The module contains three RF antenna interfaces: main set, diversity and GPS. The main
antenna interface (M), the diversity antenna interface (A) and the GPS antenna interface (G)
provide two external antenna interfaces, namely an RF connector and an antenna pad. Both
interfaces can be arbitrarily selected, but only one of them can be selected. Cables and
antennas with a 50 ohm characteristic impedance must be selected.
Table 5-9 Antenna interface characteristics
Parameter
Conditions
Specifications
Sensitivity
1900 MHz
<-107 dBm
（
Typical
）
800 MHz
<-107 dBm (Typical)
GPS
-155 dBm
RF
output
power
1900 MHz
24.5 dBm (Typical)
800 MHz
24.5 dBm (Typical)
Gain
0 dBi (unity) gain or greater
Impedance
50Ω
VSWR
Less than 3.0:1
It is recommended to use an antenna with a gain value greater than 1 dBi.
According to the user's circuit board routing to debug the parameters of each device, you
can connect 68~100nH inductor to the ground to prevent static electricity. Pay attention to the
impedance matching and antistatic or lightning strike of the antenna.
