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New Isolated RS-485 Transceivers with Integrated Transformer Driver


Maxim combines a low drop out regulator and transformer driver in a single package for improved efficiency


Designers can achieve ease of design, high efficiency, and robust communication for industrial automation applications with the MAX14853/MAX14855 and MAX14943/MAX14949 family of highly integrated RS-485 transceivers from Maxim Integrated (now part of Analog Devices).

Click for Larger Image - New Isolated RS-485 Transceivers with Integrated Transformer Driver Designers of industrial automation equipment require solutions that provide flexibility and high efficiency. The high integration of the RS-485 family of transceivers with integrated transformer drivers and low drop out (LDO) regulator simplifies power and data isolated designs. The MAX14943 isolated RS-485/PROFIBUS DP transceiver, as well as the MAX14949 transceiver, each provide up to 80% efficiency at 150mA load. Available in full or half duplex isolated RS-485 transceivers, the family supports up to 5kVrms and allows for robust communication up to 25Mbps. The transceivers are ideal for industrial automation, programmable logic controllers (PLC), HVAC, and power meter applications.

“Our high ESD transceivers, coupled with Maxim’s robust digital isolation technology, provide the industry's most robust isolated RS-485 solution on the market,” said Timothy Leung, Senior Business Manager at Maxim Integrated. “We integrated an LDO to regulate the isolated power and provide designers with a smaller solution and lower system cost.”

Features of the MAX14855 include:

  • Ease of design: Simplifies design and provides flexibility through integration; transceivers include a transformer driver and an LDO
  • Robust communication: 2.75kVrms and 5kVrms isolation options protect against large differences in ground potential between ports; Robust ±35kV (HBM ESD) on driver outputs/receiver inputs
  • High efficiency: Integrated transformer driver provides up to 80% efficiency at 150mA load

More information on the MAX14855 Isolated RS-485 Transceivers, can be found on the Maxim Integrated website at Maxim Integrated MAX14855 product page

The Maxim Integrated website address is www.maximintegrated.com.
[Reprinted with kind permission from Maxim Integrated - Release Date, 29th February, 2016]