ET-314AC
High Performance GPS Engine Board
2010/4/1
- 5 -
Electrical Specification
Absolute Maximums Ratings
Parameter
Min.
Typ.
Max.
Conditions
Unit
POWER Supply
Main power supply
3.1
3.3
3.5
V
Backup battery supply
2.0
3.5
V
Main power supply Current
23.80
26.24
26.70
mA
Backup battery supply Current
4.5
5.0
12.6
uA
Interface (VCC = 3.3V, VBAT= 3.3V, Operation Temp.= 25
℃
)
High Level input Voltage 0.7*VDD
3.5
V
Low Level input Voltage
-0.3
0.3*VDD
V
High Level input Current
-10
10
60
(V=2.85V)
(with Pull Low)
uA
Low Level input Current
-10
10
-60
(V=0V)
(with Pull High)
uA
High Level output Voltage
0.75*VDD
V
Low Level output Voltage
0.25*VDD
V
RF Input
Input Impedance
50
Ω
Operating Frequency
1.575
Ghz
☆
VDD is 2.85V for SiRF STARIII CHIP
Receiver Performance
Sensitivity Tracking:-159dBm
Cold Start 42 seconds, average
Warm Start 38 seconds, average
Hot Start 1 second, average
Reacquisition 0.1 second, average
Accuracy Position:
10 meters 2D RMS
1-5 meters 2D RMS, WAAS corrected.
Velocity: 0.1 m/s
Time: 1us synchronized to GPS time
Maximum Altitude
＜
18,000 meter
Maximum Velocity
＜
515 meter/ second
Maximum Acceleration
＜
4G
