ADM2682E lsolated RS-485 Transceiver IC Chip

ADM2682E（5 kV rms Signal and Power lsolated RS-485 Transceiver with +15 kV ESD Protection）

Introduction

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. A single 5V or 3.3V supply powers the devices, 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, l6-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. One must take special care during printed circuit board (PCB) layout to meet emissions standards.

Feature

• 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)
• 5V 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/us
• Thermal shutdown protection
• Safety and regulatory approvals
  ——UL recognition
  -5000 V rms for 1 minute per UL 1577
  ——CSA Component Acceptance Notice #5A (pending)
  -IEC 60601-1: 400 V rms (basic), 250 V rms (reinforced)
  -IEC 60950-1: 600 V rms (basic), 380 V rms (reinforced)
  ——VDE Certificates of Conformity
  -DIN V VDE V 0884-10 (VDE V 0884-10): 2006-12
  -Viorm = 846 V peak
• Operating temperature range: -40°C to +85°C
• 16-lead wide-body SOIC with >8 mm creepage and clearance

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