EVA2200-A Maestro Wireless Solutions, EVA2200-A Datasheet - Page 24

• Manufacturer Part Number: EVA2200-A
• Description: GPS Development Tools SiRFStar IV GPS Eval kit SMT ROM module
• Manufacturer: Maestro Wireless Solutions

Specifications of EVA2200-A

• Rohs: yes
• Product: Evaluation Kits
• Tool Is For Evaluation Of: A2200-A
• Frequency: 1.575 GHz
• Operating Supply Voltage: 3.3 V
• Interface Type: USB
• Description/function: GPS Evaluation Kit EVA2200-A allows an easy evaluation of Maestro's SiRFstarIV GPS receiver module A2200-A
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Current: 50 mA
• Processor Used: SiRFstar IV

V1.0 – Feb-12
8 Use of GPS Antennas
8.1 Connecting a GPS antenna to the GPS receiver
The ANT pin is used to connect a GPS antenna to the receiver. The design of the
antenna connection has to be done strictly according to RF design rules. A 50  PCB
strip line is required. The following drawings shall explain the guidelines. A major rule
is to keep the strip line as short as possible. Additionally, antenna ground
(ANT_GND) should be routed to the ground plane of the PCB (the ground plane is on
a lower PCB layer) by vias as demonstrated in the drawing.
In order to achieve the impedance of 50 , the width of the strip line needs to be
calculated. It depends on the thickness or height of the PCB layer (both parameters
are shown in following drawing). For the calculation, it is assumed that the PCB
material is FR4.
GPS Receiver
ANT_GND
Motherboard Bottom Layer
Vias to Top Layer
GPS receiver solder pads
Figure 10: Antenna connector strip line A2200-A
ANT_INT
Figure 11: Strip line parameters A2200-A
User’s Manual
Top view
GPS Receiver
ANT_GND
50Ωstrip line
Vias to GND Layer
Motherboard Top Layer
ANT_INT
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