User's Manual

LE910 Hardware User Guide
1vv0301089 Rev.3 – 09-06-2014
Reproduction forbidden without Telit Communications S.p.A. written authorization - All Rights Reserved page 43 of 79
The LE910 module is integrating a GNSS receiver that could be used in Autonomous or in A-GPS
(assisted GPS) mode.
The module includes already an LNA (13.5dB gain typ.) so it could be used with a passive antenna.
The Pads related to this function are the following:
PAD
Signal
I/O
Function
Type
R9
ANT_GNSS
I
GNSS Antenna (50 ohm)
RF
R7
GNSS_LNA_EN
O
Output enable for External LNA supply
CMOS 1.8V
It is recommended to use antennas as follow:
• An external passive antenna (GPS only)
• An external passive antenna, GNS pre-Filter
The external pre-Filter shall be required for GLONASS application.
The Glonass pre-Filter requirement shall fulfil the following requirements:
 Source and Load Impedance = 50Ohm
 Insertion Loss (1575.42 – 1576.42MHz) = 1.4dB (Max)
 Insertion Loss (1565.42 – 1585.42MHz) = 1.4dB (Max)
 Insertion Loss (1597.5515 – 1605.886MHZ) = 2.0dB (Max)