Leadtek LR9805-T GPS Module

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LR9805-T

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Leadtek LR9805-T GPS Module
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Product description

The Leadtek LR9805 module is a high sensitivity, low power, SMD type 12-channel GPS receiver designed for a broad spectrum of OEM applications. It is based on the GPS signal search capabilities of the SiRFstarIIeLP chipset, providing excellent navigation performance in the most challenging urban environments. Offered in two configurations, the LR9805-C comes with a regular crystal and is hardware compatible with the SiRF standard GSW2.X GPS software. It is also WAAS and 1PPS enabled for both position and time accuracy The LR9805-T is a versatile design with a TCXO crystal for higher performance and is compatible to SiRFXtrac high sensitivity software. The LR9805 provides excellent sensitivity and high configurability in a small package. The module ensures flexible and easy integration with its user-configurable serial I/O ports, which support both NMEA and SiRF-proprietary binary protocols.

The LR9805 allows you to acquire and continue tracking GPS signals at far lower signal levels than is currently  possible with other autonomous GPS solutions. This means that GPS can now be used in environments previously deemed impossible such as severe urban canyons, dense foliage, deep inside parking garages, and in many cases indoors.

The compact module size of the LR9805 is just right for easy integration into any small space. The module is enclosed within a protective metal shield for easy handling. This allows for fully automatic assembly processing with standard pick-andplace equipment and is reflow solder assembly ready.

The LR9805 offers a reference design detailing how to implement the SMD module into your system. You can follow the reference design to make applications such as Smart antennas, on-board GPS devices, Location Base devices, and PDAs.

The LR9805 supports signal detection using an external active antenna. For optimum performance, Leadtek recommends using a 3.3V external active antenna with a builtin filter inside.

Technical specifications

Performance features

  • 12 channel, L1 (1575.42 MHz) C/A
    code, autonomous GPS receiver
  • Acquisition time Hot start / Warm start / Cold start
    8  / 38 / 45 seconds typical TTFF
  • Reacquisition time: 0.1 seconds average
  • Position Accuracy: 10 meters, 2D RMS
  • Altitude: <+/35 m vertical in term of 95%
  • Velocity: 0.1 m/s
  • Time: 1 us synchronized to GPS time
  • DGPS (Optional) <5m (50%)
  • Acquisition Sensitivity Hot / Warm / Cold
    23 / 28 / 32 dB-Hz
  • Tracking sensitivity: -154dBm
  • Velocity: 515 m/s (1,000 knots) Max
  • Acceleration: 4g Max
  • Altitude: 18,000 m (60,000 ft) Max
  • Jerk: 20 m/s

Electrical characteristics

  • Main power input: 3.3±5%V DC input
  • Power consumption: 65 mA @ 3.3V = 215 mW
  • Backup Power: 1.8±10%V DC input

Physical characteristics

  • Dimensions: 0.94 in (L) x 0.79 in (W) x 0.11 in (H)
    24 mm (L) x 20 mm (W) x 2.8 mm (H)
  • Weight: 2.5 g

Environmental

  • Operating Temperature: -40 °C to +85 °C
  • Storage Temperature: -55 °C to +100 °C
  • Relative Humidity: 5% to 95%, non-condensing

Interfaces

  • Interface Connectors I/O:
    28 Pin SMD micro package
  • Input/Output Protocol: NMEA/SiRF Binary
  • Baud Rate: 4800 bps default (user configurable
    from 4,800 to 38,400 bps)
  • Update Rate: Programmable update rate (1 Hertz
    default)
  • Datum: WGS 84 default (User configurable)
  • Protocol Message: GGA(1sec), GSA(5sec),
    GSV(5sec), RMC (1sec), VTG(1sec)
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