EVA2200-A Maestro Wireless Solutions, EVA2200-A Datasheet - Page 15

• 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
NOTE: It is recommended to supply Vcc continuously! Use SiRFaware
other low power modes to reduce power consumption of the module while no
position information is required.
Remarks:
3.2 Antennas
Generally, the quality of the GPS antenna chosen (passive or active) is of paramount
importance for the overall sensitivity of the GPS system. Losses through a bad an-
tenna, long cables or tracks or a bad antenna position can’t be compensated after-
wards!
3.2.1 Passive Antennas
The A2200-A supports passive antennas via an integrated LNA directly.
3.2.2 Active Antennas
The A2200-A also supports active antennas directly, i.e. by offering an antenna
voltage feed pin (VANT – pin 9). It is recommended to use an active antenna with a
supply voltage of 3 to 5 VDC and a maximum current draw of 50 mA. The antenna
should have a gain ≥ 15dB but the total gain (antenna gain minus cable loss at the
 Place C1 to C5 (here: 0.1µF) close to MAX3232. For capacity values see
 Use 3.3V level shifter (MAX3232 or equivalent).
 External antenna input impedance is 50 . Match as close as possible.
datasheet of actual component used.
RS232 Out
RS232 Out
6
6
7
7
8
8
9
9
1
1
2
2
3
3
4
4
5
5
Figure 6: RS232 level shifter
User’s Manual
C1+
C1+
V+
V+
C1-
C1-
C2+
C2+
C2-
C2-
V-
V-
T2O
T2O
R2I
R2I
MAX3232
MAX3232
RS232 Level Shifter
RS232 Level Shifter
GND
GND
R1O
R1O
R2O
R2O
T1O
T1O
Vcc
Vcc
R1I
R1I
T1I
T1I
T2I
T2I
3.3V
3.3V
GND
GND
Rx
Rx
Tx
Tx
TM
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