Analog Devices ADM2867E Isolated RS-485 Transceiver

Analog Devices ADM2867E Isolated RS-485 Transceivers are a 5.7kVrms signal and power isolated RS-485 transceivers. The devices pass radiated emissions testing to the EN55032 Class B standard with margin on a 2-layer printed circuit board (PCB) using two small external 0402 ferrites on isolated power and ground pins. The device features an integrated, low electromagnetic interference (EMI), isolated dc-to-dc converter, which eliminates the need for an external isolated power supply. The isolation barrier provides immunity to system-level electromagnetic compatibility (EMC) standards. The family of isolator devices features ±12kV contact and ±15kV air IEC61000-4-2 ESD protection on the RS-485 A, B, Y, and Z pins. The devices also feature cable invert pins, allowing the user to quickly correct reversed cable connection on the A, B, Y, and Z bus pins while maintaining full receiver fail-safe performance.

Features & Specs

* 5.7kVrms isolated RS-485/RS-422 transceiver * Low radiated emissions, integrated, isolated DC-to-DC converter * Passes EN55032 Class B with margin on a 2-layer PCB * Cable invert smart feature * Correct reversed cable connection on A, B, Y, and Z bus pins while maintaining full receiver fail-safe feature * ESD protection on RS-485 A, B, Y, and Z pins * ≥±12kV IEC61000-4-2 contact discharge * ≥±15kV IEC61000-4-2 air discharge * High speed 25Mbps data rate (ADM2865E/ADM2867E) * Low-speed 500kbps data rate for EMI control (ADM2861E/ADM2863E) * Flexible power supplies * Input VCC supply of 3V to 5.5V * Logic VIO supply of 1.7V to 5.5V * VSEL pin to select VISO supply of 5V (VCC > 4.5V) or 3.3V * PROFIBUS compliant for 5V VISO * −40°C to +105°C wide operating temperature range * High common-mode transient immunity: 250kV/μs * Short-circuit, open-circuit, and floating input receiver fail-safe * Supports 196 bus nodes (72kΩ receiver input impedance) * Full hot-swap support (glitch-free power-up/power-down) * Safety and regulatory approvals (pending) * CSA Component Acceptance Notice 5A, DIN V VDE V 0884-11, UL 1577, CQC11-471543-2012, IEC 61010-1 * 28-lead, fine pitch SOICW package (10.15mm × 10.05mm) with >8.0mm creepage and clearance