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The Leadtek LR 9548S GPS module is a high sensitivity, low power, Surface Mount Device(SMD). This 20-channel global positioning system (GPS) receiver is designed for a wide range of OEM applications and is based on the GPS single search capabilities of the SiRFStarIII low power single chipset, SiRF'S newest chipset technology. The LR9548S is also pin-to-pin compatible with the LR 9805-III (LR 9548) for easier and faster transition.


SiRFstarIII features[1]:
  • A 20-channel receiver, which can process the signals of all visible GPS and WAAS satellites simultaneously.
  • Power consumption of 62 mW during continuous operation.
  • Assisted GPS can reduce TTFF to less than one second.
  • Receiver sensitivity of -159 dBm while tracking.
  • SBAS (WAAS, MSAS, EGNOS) support


  • Based on the high performance features of the SiRFstarIII low power single chip set
  • Compact module size for easy integration: 24x20x2.9 mm ( 0.94 x 0.79 x 0.11 in )
  • Fully automatic assembly: reflow solder assembly ready
  • Hardware compatible with SiRF GSW3 v 3.2.2 software
  • Multiple I/O pins reserved for customizing special user applications
  • RoHS compliance
  • Cold/Warm/Hot Start Time: 42 /35/ 1 sec . at open sky and stationary environments.
  • Reacquisition Time: 0.1 second
  • RF Metal Shield for best performance in noisy environments
  • Multi-path Mitigation Hardware
  • TTL level serial port for GPS communications interface
  • Protocol: NMEA-0183/SiRF Binary (default NMEA)
  • Baud Rate: 4800, 9600, 19200, 38400 or 57600 bps (default 4800)
  • Ideal for high volume mass production(Taping reel package)
  • Cost saving through elimination of RF and board to board digital connectors
  • Flexible and cost effective hardware design for different application needs
  • Secure SMD PCB mounting method
LR 9548S
Feature Item Description
Chipset GSC 3f SiRFstarIII low power single chipset
General Frequency L1, 1575.42 MHz
C/A code 1.023 MHz chip rate
Channels 20
Accuracy Position 10 meters, 2D RMS
5 meters 2D RMS, WAAS corrected
Velocity 0.1 meters/second
Time 1 microsecond synchronized to GPS time
Datum Default WGS-84
Other selectable for other Datum
Time to First Fix (TTFF)
(Open Sky & Stationary Requirements)
Reacquisition 0.1 sec., average
Snap start 1 sec., average
Hot start 1 sec., average typical TTFF
Warm start 38 sec., average typical TTFF
Cold start 42 sec., average typical TTFF
Dynamic Conditions Altitude 18,000 meters (60,000 feet) max.
Velocity 515 meters/second (1000 knots) max.
Acceleration 4g , max.
Jerk 20 meters/second 3, max.
Power Main power input 3.3 ~ 5.0 VDC input
Power consumption ≈165 mW (continuous mode)
Supply Current ≈49 mA
Backup Power 1.65 ~ 5.0 VDC input.
Serial Port Electrical interface Two full duplex serial TTL interface.
Protocol messages NMEA-0183@4800 bps (Default)
Time-1PPS Pulse Level TTL
Pulse duration The 1PPS pulse width is 1 μs, this 1PPS is NOT suited to steer various oscillators (timing receivers, telecommunications system, etc).
Time reference At the pulse positive edge.
Measurement Aligned to GPS second, ± 1 microsecond
Environmental Characteristics Operating temperature range -30 °C to +85 °C
Storage temperature range -55 °C to +100 °C
Physical Characteristics Length 24 mm ± 0.1mm ( 0.94in)
Width 20 mm ± 0.1mm ( 0.79 in)
Height 2.9 mm ± 0.1mm ( 0.11 in)
Weight 2.5g
Software Core of firmware SiRF GSW 3.2.2
Baud rate 4800, 9600, 19200, 38400 or 57600 bps (default 4800)
Code type NMEA-0183 ASCII
Datum WGS-84
Protocol message GGA(1sec), GSA(5sec), GSV(5sec), RMC(1sec),VTG(1sec)
Output frequency 1 Hz
  • All specifications are subject to change without notice. Please check with your supplier for exact offers. Products may not be available in all markets.
  • The bundled adapter, cable and software information on this webpage is provided for informational purposes only and is subject to change without notice.
  • Brand and product names mentioned are trademarks of their respective companies.
  • VMware and VMware Ready is a registered trademark or trademark of VMware, Inc. in the United States and/or other jurisdictions.
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