Isolating signal and power in RS-485 nodes can present a design challenge in terms of achieving an optimum configuration that satisfies system requirements such as small form factor, lower power dissipation, data rates, EMI, and bill of materials cost. In this article, learn how the Analog Devices RS-485 isolated transceiver portfolio offers flexibility and performance with significant advantages over the optocoupler approach.
ADI has developed a range of innovative integrated isolated RS-485 transceivers that combine ADI’s advances in RS-485 interface technology with ADI’s iCoupler® digital signal isolation technology, and, more recently, with ADI’s isoPower® isolated DC-to-DC converter technology. These isolated transceiver products were designed for use in a wide variety of applications in harsh environments such as industrial automation, solar and wind energy, instrumentation, and power-line monitoring. Examples of some of the industrial communication protocols that use these families of products are PROFIBUS®, Interbus, Modbus, BacNet, etc.
ADI’s portfolio basically addresses three broad classifications for the partitioning of the power chain for isolated RS-485 nodes:
- • A totally integrated signal and power isolated RS-485/RS-422 solution
- • Integrated signal isolation and integrated transformer driver (partial power chain integration)
- • Signal isolated RS-485/RS-422 transceivers that allow flexibility of choice of the source of the bus-side voltage power supply
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