Embedded 2.4GHz radio transceiver modem for stable communications


CIRCUIT Design has released the STD-502-R, an embedded 2.4 GHz radio transceiver modem for industrial use.

The STD-502-R operates in the 2.4 GHz band available worldwide. Designed to be embedded in equipment, this radio transceiver module was developed for industrial applications that require stable and reliable operation.

With battery operation, it achieves line of sight radio communication beyond 300 m.

Besides using highly noise-resistant direct-sequence spread spectrum (DSSS) modulation, the module has a true diversity receiver function for preventing signal dropout due to multipath fading. This ensures highly stable and reliable radio communication in the congested 2.4. GHz ISM band.

These main functions are incorporated in a newly designed, proprietary ASIC, which eliminates reliance on RFICs.

The transceiver uses a transparent input/output interface, enabling users to use their own protocols. In addition, the transceiver can transmit data that includes long consecutive identical bits that cannot be transmitted with conventional radio modules.

Besides the STD-502-R, Circuit Design’s product line includes the STD-302N-R industrial-use transceiver covering 300 MHz to 1.2 GHz, providing coverage of the ISM bands around the world.

Samples will be available from January 2013.  Production is planned to start in May 2013.

Technical features

  • Direct sequence spread spectrum (DSSS)
  • True diversity receiving
  • Communication range 300 m (LOS)
  • Low power operation  10 mW  3.3 V  68 mA
  • Data rate  9.6 kbps / 19.2 kbps
  • Built-in data frame coincidence detection function
  • Operating temperature range  -20 to +65 °C
  • Compliance with European EN 300 440, American FCC Part 15.247, and Japan ARIB STD-T66 regulations