SA25 - GPS Receiver Interface Adapter (Product Discontinued)

The SA25 provides a GPS receiver interface which supports L1 frequency, C/A code and SPS. An external active or passive antenna can be connected to a rugged SMA connector at the front panel. The received GPS signals are sent to the host via a 5V TTL COM port with a data transfer rate of 4800 baud (configurable).

SA-Adapters are small universal boards providing the line drivers for legacy serial I/O, fieldbus interfaces and other small I/O functions. One serial line is provided per adapter, which can be plugged directly to the CPU board as a mezzanine. Alternatively, the adapter can be connected to the front panel via ribbon cable. The SA concept allows to add additional I/O interfaces to many of MEN's CPU boards, enhancing flexibility with regard to the line transceivers and isolation requirements. Whether a specific SA-Adapter (or a mix of different SA-Adapters) fits on a specific CPU board is determined by a combination of mechanical, performance, FPGA and operating system criteria and needs to be verified for every board configuration requested.


  • 48-channel GPS receiver
  • GPS according to NMEA 0183
  • L1 frequency, C/A code, SPS
  • Rugged SMA connector
  • Optical isolation
  • -40 °C to +85 °C


GPS Interface
  • 48-channel GPS (Global Positioning System) receiver based on SiRF IV
  • GPS Band/Code: L1 frequency, C/A code, SPS
  • Integrated TCXO, RTC
  • Accuracy (unaided):
    • Position: 2.5 m (CEP50)
    • Velocity: 0.01 m/s (50%)
    • Time: 1 µs (typ.)
  • Time To First Fix (TTFF):
    • Cold start: 35 s typ.
    • Warm start: 35 s typ.
    • Hot start: 1 s typ.
  • Sensitivity:
    • Acquisition (cold): -147 dBm
    • Re-Acquisition: -162 dBm
    • Tracking: -163 dBm
  • Protocol: NMEA 0183 (configurable to SiRF binary OSP)
  • One SMA antenna connector at front panel
    • For the use of an external active or passive antenna
    • Rugged screw connection
    • Outside thread
    • Inner conductor female
Host Interface
5 V TTL COM port
  • Data transfer rate configurable (default: 4800 baud 8N1)
  • Time Mark (TM) output signal provides pulse-per-second (PPS) output pulse signal for timing purposes
  • As a piggy-back board directly on a carrier board
  • Via ribbon cable
Electrical Specifications
  • Isolation voltage:
    • Optical isolation: 2.5 kVAC between isolated side and digital side
  • Supply voltage/power consumption:
    • +5 V (-3%/+5%), 120 mA without antenna, 190 mA with antenna (depends on used antenna)
    • Max. supported power consumption for active antenna: +5 V / 70 mA
    • Impedance: 50 Ohm
Mechanical Specifications
  • Dimensions: 32 mm x 42 mm
  • Weight: 20 g
Environmental Specifications
  • Temperature range (operation):
    • -40..+85°C
    • Airflow: min. 1 m/s
  • Temperature range (storage): -40..+85°C
  • Relative humidity (operation): max. 95% non-condensing
  • Relative humidity (storage): max. 95% non-condensing
  • Altitude: -300 m to +3000 m
  • Shock: 15 g, 11 ms
  • Bump: 10 g, 16 ms
  • Vibration (sinusoidal): 1 g, 10..150 Hz
  • Conformal coating on request
826 041 h @ 40°C according to IEC/TR 62380 (RDF 2000)
PCB manufactured with a flammability rating of 94V-0 by UL recognized manufacturers
EMC Conformity
  • EN 50121-3-2 (table 4, 5, 6) (EMC in rolling stock)
  • EN 55011 (radio disturbance)
  • EN 61000-4-2 (ESD)
  • EN 61000-4-3 (electromagnetic field immunity)
  • EN 61000-4-4 (burst)
  • EN 61000-4-5 (surge)
  • EN 61000-4-6 (immunity to conducted disturbances)