EVA-7M - Hardware Integration Manual
UBX-12003235 - R05
Production Information
Design-in
Page 7 of 42
2
Design-in
In order to obtain good performance with a GNSS receiver module, there are a number of points that require
careful attention during the design-in. These include:
•
Power Supply:
Good performance requires a clean and stable power supply.
•
Interfaces:
Ensure correct wiring, rate and message setup on the module and your host system.
•
Antenna interface: For optimal performance, seek short routing, matched impedance and no stubs.
•
External LNA:
With EVA-7M an additional external LNA is mandatory if a passive antenna is used to
achieve the performance values as written in the
EVA-7M Data Sheet
2.1
Power management
2.1.1
Overview
The EVA-7M provides 4 supply pins:
VCC
,
VCC_IO
,
V_BCKP
and
V_USB
. They can be supplied independently or
tied together to adapt various concepts, depending on the intended application. The different supply voltages
are explained in the following subsections.
Figure 1 shows an example to supply the EVA-7M module when not using the USB interface. In this case, the
V_USB
pin is connected to ground.
Figure 1: EVA-7M power supply example
