ML865G1 HW Design Guide
1VV0301632 Rev. 4 Page 68 of 86 2020-09-23
8.3.2. GNSS Antenna – Installation Guidelines
• The antenna must be installed according to the antenna manufacturer’s instructions to
obtain the maximum performance of GNSS receiver.
• The antenna location must be evaluated carefully if operating in conjunction with any
other antenna or transmitter.
• The antenna must not be installed inside metal cases or near any obstacle that may
degrade features like antenna lobes and gain.
8.3.3. Powering the External LNA (active antenna)
The LNA of active antenna needs a source of power because 1.8V or 3V DC voltage
needed by active antenna is not supplied by the ML865G1 module, but can be easily
included by the host design.
The electrical characteristics of the GPS_LNA_EN signal are:
Example of external antenna bias circuitry:
Be aware of max bias current in case of unwanted short on antenna cable, decoupling
inductor may be damaged.
In case of LNA with 1.8V supply, VAUX/POWERMON pin can be used to supply active
GNSS antenna
Level Min Max
Output High Level 1.6V 1.9V
Output Low Level 0V 0.3V
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