GLOBALSAT ET-314 GPS Engine Board - Manual (Page 5)

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