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05-23-2011

Analog Devices Introduces First Single-Chip 5-kVrms Signal and Power Isolated RS-485 Transceivers for Safe High-Voltage Systems

Analog Devices » ADM2682E, ADM2687E

The ADM2682E/ADM2687E are fully integrated 5 kV rms signal and power isolated data transceivers with ±15 kV ESD protection and are suitable for high speed communication on multipoint transmission lines. The ADM2682E/ADM2687E include an integrated 5 kV rms isolated dc-to-dc power supply, which eliminates the need for an external dc-to-dc isolation block.

Analog Devices - ADM2682E, ADM2687E

They are designed for balanced transmission lines and comply with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E).

The devices integrate Analog Devices, Inc., iCoupler® technology to combine a 3-channel isolator, a three-state differential line driver, a differential input receiver, and Analog Devices isoPower dc-to-dc converter into a single package. The devices are powered by a single 5 V or 3.3 V supply, realizing a fully integrated signal and power isolated RS-485 solution.

The ADM2682E/ADM2687E driver has an active high enable. An active low receiver enable is also provided, which causes the receiver output to enter a high impedance state when disabled.

The devices have current limiting and thermal shutdown features to protect against output short circuits and situations where bus contention may cause excessive power dissipation. The parts are fully specified over the industrial temperature range and are available in a highly integrated, 16-lead, wide-body SOIC package with >8 mm creepage and clearance.

The ADM2682E/ADM2687E contain isoPower technology that uses high frequency switching elements to transfer power through the transformer. Special care must be taken during printed circuit board (PCB) layout to meet emissions standards. Refer to Application Note AN-0971, Control of Radiated Emissions with isoPower Devices, for details on board layout considerations.

Applications

  • Isolated RS-485/RS-422 interfaces
  • Industrial field networks
  • Multipoint data transmission systems

Features

  • 5 kV rms isolated RS-485/RS-422 transceiver, configurable as half or full duplex
  • isoPower® integrated isolated dc-to-dc converter
  • ±15 kV ESD protection on RS-485 input/output pins
  • Complies with ANSI/TIA/EIA-485-A-98 and ISO 8482:1987(E)
  • Data rate: 16 Mbps
  • 5 V or 3.3 V operation
  • Connect up to 256 nodes on one bus
  • Open- and short-circuit, fail-safe receiver inputs
  • High common-mode transient immunity: >25 kV/μs

analog.com

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