LEA-5, NEO-5, TIM-5H - Hardware Integration Manual
GPS.G5-MS5-09027-A2
Released
Design-in
Page 23 of 68
2
Design-in
For migrating existing ANTARIS
®
4 product designs to u-blox 5 please refer to Appendix
In order to obtain good performance with a GPS 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.
2.1
Design-in checklist
Good performance requires a clean and stable power supply with minimal ripple. Care needs to be exercised in
selecting a strategy to achieve this. Series resistance in the Vcc supply line can negatively impact performance.
For better performance, use an LDO to provide a clean supply at Vcc and consider the following:
Wide power lines or even power planes are preferred.
Place LDO near the module.
Avoid resistive components in the power line (e.g. narrow power lines, coils, resistors, etc.).
Placing a filter or other source of resistance at Vcc can create significantly longer acquisition times.
2.1.1
Layout design-in checklist
Designing-in a u-blox 5 module is easy, especially when based on a u-blox reference design. Nonetheless, it pays
to do a quick sanity check of the design. This section lists the most important items for a simple design check.
The Layout Design-In Checklist also helps to avoid an unnecessary respin of the PCB and helps to achieve the
best possible performance.
Follow the design-in checklist when developing any u-blox 5 GPS applications. This can significantly
reduce development time and costs.
Have you chosen the optimal module?
u-blox 5 modules have been intentionally designed to allow GPS receivers to be optimally tailored to specific
applications. Changing between the different variants is easy.
Do you need Kick-start performance – Then choose an
H
3
,
S
4
,
Q
5
, or
G
6
variant.
Do you want to be able to upgrade the firmware or to permanently save configuration settings? Then you
will have to use a Programmable receiver module: choose an
Do you need USB? All LEA-5 and NEO-5 modules based on FW/ROM 5.00 and above support USB.
Do you need Precision Timing – Then choose a LEA-5
T
.
Check Power Supply Requirements and Schematic:
Is the power supply within the specified range (see data sheet)?
3
LEA-5H, TIM-5H.
4
LEA-5S
5
LEA-5Q, NEO-5Q
6
NEO-5G
