MeiG_SLM320_Hardware Design Manual
MeiG Smart Technology Co., Ltd
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4 GNSS Receiver
4.1 General Description
SLM320 use the independent GPS chip
，
includes a fully integrated global navigation satellite system
solution that supports GPS, GLONASS, BeiDou. It supports standard NMEA-0183 protocol.
4.2 GNSS Performance
Cold start time<40S
Hot start time<5S
Tracking sensitivity-160dBm
Acquisition sensitivity-147dBm
Position accuracy<3m
4.3 Layout Guidelines
The following layout guidelines should be taken into account in customers’ designs.
Maximize the distance among GNSS antenna, main antenna.
Digital circuits such as (U) SIM card, USB interface, and camera module and display connector
should be kept away from the antennas.
Use ground vias around the GNSS trace and sensitive analog signal traces to provide coplanar
isolation and protection.
Keep 50Ω characteristic impedance for the ANT_GNSS trace.
4.4 Antenna connection
Customers can use active antenna and passive antenna. If customers use active antenna, please refer
to the figure below, if passive antenna is used, please refer to the figure (Figure 19 RF reference circuit)
