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ZX4125 Ultra low power high sensitivity GPS module
General Description

The ZX4125 is a high sensitivity; ultra low power consumption; cost efficient, compact size; plug & play GPS module designed for a broad spectrum of OEM applications. This product is based on the proven technology found in other Wondeproud 16-channel GPS receivers. The GPS module receiver will track up to 16 satellites at a time while providing fast time-to-first-fix and 1Hz navigation updates. Its far-reaching capability meets the sensitivity & accuracy requirements of car navigation as well as other location-based applications, such as AVL system. Handheld navigator, PDA, pocket PC, or any battery operated navigation system.
The ZX4125/ZX4125P design utilizes the latest surface mount technology and high level circuit integration to achieve superior performance while minimizing dimension and power consumption. This hardware capability combined with software intelligence makes the board easy to be integrated and used in all kinds of navigation applications or products. The module communicates with application system via RS232 (TTL level) with NMEA0183 protocol.

Features

  • Built-in high performance NEMERIX chipset
  • Average Cold Start in 45 seconds
  • Ultra Low power consumption (ZX4125 27mA@3.3V typical)
  • 16 channels "All-in-View" tracking
  • On chip 4Mb flash memory
  • TTL level serial port for GPS receiver command message Interface
  • Compact Board Size for easy integration into hand-held device.
  • Support Standard NMEA-0183 V3.0
  • Option Accurate 1PPS Output Signal Aligned with GPS Timing
  • Multi-path Mitigation Hardware

  • Optimum clock drift adjustment

  • External antenna open/short detector
  • Support dual antenna with built-in auto-detect RF switch (ZX4125P)
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    Specification
    Electrical Characteristics
    General
    Frequency L1, 1575.42 MHz
    C/A code 1.023 MHz chip rate
    Channels 16
     
    Sensitivity
    Tracking -152dBm typical
    Acquisition -140dBm typical
     
    Accuracy
    Position 7 meters CEP (90%) horizontal, SA off
    Velocity 0.1 meters/second
    Time 1 microsecond synchronized to GPS time
     
    Datum
    Default WGS-84
    Other Support different datum by request
     
    Acquisition Rate (Open sky, stationary requirements)
    Hot start 6 sec, average
    Warm start 38 sec, average
    Cold start 45 sec, average
     
    Dynamic Conditions
    Altitude 10,000 meters max
    Horizontal Velocity 300 kilometers/hour max
    Vertical Velocity 36 kilometers/hour max
    Acceleration 2g, max
    Jerk 4 meters/second3, max
     
    Power
    Main power input 3.3 ±5% VDC input.
    Supply Current ZX4120 27mA@3.3V (Continuous mode)
    ZX4125P 33mA @ 3.3V (Continuous mode) including LNA
     
    Serial Port
    Electrical interface one full duplex serial communication, TTL interface
    Protocol message NMEA-0183, version 3.0 optional
    Default NMEA GGA, GSA, GSV, RMC and VTC. 9600 baud rate, 8 bits data, 1 start, 1 stop, no parity.
    (GSA & GSV is 3sec output 1msg, option baud rate: 4800,19200, 38400)
     
    Time-1PPS Pulse (optional)
    Level TTL
    Pulse duration 100ms
    Time reference at the pulse positive edge
    Measurements Aligned to GPS second, +/-1 microsecond
     
    Recommended External Antenna Specification
    Gain 20dB (including cable loss)
    Noise figure 1.5dB
    Current 3 ~ 30mA
    Operate Voltage 2.5 ~ 2.8V
     
    Environmental Characteristics
    Operating temperature range -40°C to +80°C
    Storage temperature range -55°C to +100°C
     
    Physical Characteristics
    Dimension: ZX4125 1.043"x1.043"x0.11" (26.5x26.5x3.0mm)
    Weight: ZX4125 3.8g
    Antenna connector: 1.27 mm pitch 3 pin board to board
    Interface connector: 1.27 mm pitch 10 pin / 6 pin board to board