SiRF芯片
Chip set：SiRF GSC3x
Supply power：3.3V +- 5%
Channels：12
sensitivity：-155dBm
protocol：Support NMEA 0183 and SiRF binary protocol
Power consumption：Continuous : 42mA typical；Trickle power: 29mA typical

Baud rate：4,800 to 57,600 bps adjustable
antenna：No Antenna (External Active)   RF_VCC(2.85V)
Dimension：25.4mm * 25.4mm * 7mm
Output：TTL level, 0V ~ 2.85V
PIN：No SMT pad