ADM2687E

PRODUCTION

500 kbps, 5 kV rms Signal & Power Isolated RS-485 Transceiver with ±15 kV ESD Protection

Data Sheet (Rev. D) Product Selection Table
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Overview

  • 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 (ADM2682E), 500 kbps (ADM2687E)
  • 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
  • Thermal shutdown protection
  • Safety and regulatory approvals
    • UL 1577
      • VISO = 5000 V rms for 1 minute
    • IEC/CSA 62368-1
    • IEC/CSA 60601-1
    • IEC/CSA 61010-1
    • CQC GB 4943.1
    • DIN EN IEC 60747-17 (VDE 0884-17) (Pending)
      • VIORM = 846 V peak
    • Operating temperature range: −40°C to +85°C
    • 16-lead wide-body SOIC with >8 mm creepage and clearance

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 that eliminates the need for an external dc-to-dc isolation block.

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 drivers have 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 AN-0971 Application Note, Recommendations for 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
ADM2687E
500 kbps, 5 kV rms Signal & Power Isolated RS-485 Transceiver with ±15 kV ESD Protection
ADM2682E-ADM2687 Functional Block Diagram
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Documentation

Data Sheet 1

User Guide 1

Application Note 4

Informational 1

Safety and Regulatory Compliance 1

Frequently Asked Question 1

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Hardware Ecosystem

Parts Product Life Cycle Description
ADM2863E
RECOMMENDED FOR NEW DESIGNS 5.7 kV RMS 500kbps Full Duplex Signal and Power Isolated RS-485 Transceiver with ±15 kV IEC ESD
ADM2861E
RECOMMENDED FOR NEW DESIGNS 5.7 kV RMS 500kbps Half Duplex Signal and Power Isolated RS-485 Transceiver with ±15 kV IEC ESD
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Tools & Simulations

IBIS Model 1

Evaluation Kits

EVAL-ADM2687E

ADM2687E Evaluation Board

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Features and Benefits

  • 5 kV rms power and signal isolated RS-485/RS-422 transceiver
  • Convenient connections for power and signal through screw terminal blocks
  • Configurable as half duplex or full duplex
  • 5 V or 3.3 V operation
  • Easily configurable through jumper connections
  • Test points for measuring all signals
  • Layout optimized for emissions

Product Details

The ADM2687E evaluation board can be used for easy evaluation of the ADM2682E and ADM2687E power and signal isolated RS-485 transceivers. Screw terminal blocks provide convenient connections for the power and signal connections. The evaluation board is easily configured through jumper connections. The board can be used in half-duplex or fullduplex configurations and has a 120 Ω termination resistor fitted on the receiver input. The evaluation board can be used with either the ADM2682E 16 Mbps part or the ADM2687E 500 kbps part. The driver and receiver are enabled and disabled by jumper connections. Test points are included on the power and signal lines on both sides of the isolation barrier.
EVAL-ADM2687E
ADM2687E Evaluation Board

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