ADM2867EBRNZ-RL7

Overview

The ADM2867EBRNZ-RL7 is a full-duplex RS-485/RS-422 transceiver featuring 5.7 kV RMS signal and power isolation with an integrated DC-to-DC converter. It supports data rates up to 25 Mbps and operates on a primary supply voltage of 3 V to 5.5 V, with a logic supply range of 1.7 V to 5.5 V. The device provides ±12 kV contact and ±15 kV air IEC ESD protection on bus pins A, B, Y, and Z. It includes cable inversion features for both driver and receiver, supports 192 bus nodes, and offers high common-mode transient immunity of 250 kV/µs. Operating temperatures range from -40°C to +105°C in a 28-lead SOIC_W package.

Feature Summary

• Integrated isolated DC-to-DC converter eliminates the need for external isolated power supplies.
• Cable invert functionality allows correction of reversed cable connections while maintaining fail-safe performance.
• High robustness against electromagnetic interference with EN 55032 Class B radiated emissions compliance.
• Supports hot swap operations with glitch-free power-up and power-down capabilities.

Applications

• Industrial field buses
• Building automation networks
• Heating, ventilation, and air conditioning (HVAC) systems
• Utility networks and energy meters

Procurement Notes

Verify the specific ordering suffix RL7 corresponds to reel packaging when sourcing components. Confirm that the procurement channel provides valid manufacturer traceability documentation. Ensure the received units match the ADM2867E specification sheet parameters before integration into production designs.

Selection Notes

Select this component for applications requiring high-speed 25 Mbps communication over long distances with significant electrical noise. The integrated isolation barrier simplifies design by removing external transformer requirements. Consider the 28-lead wide body package dimensions for PCB layout constraints and thermal management requirements in dense industrial environments.

Part Context

This part belongs to the ADM286xE family of isolated transceivers from Analog Devices. It shares architectural similarities with the ADM2865E but differs in duplex operation mode. The family is designed to meet stringent safety standards including UL 1577 and IEC 62368-1 for reinforced insulation requirements in industrial control systems.

Replacement Considerations

ADM2865EBRNZ-RL7 serves as a half-duplex alternative within the same isolation family. Designers must account for differences in data rate support and pinout configurations when substituting between full-duplex and half-duplex variants in existing circuit layouts.

FAQ

How does the Cable Invert feature function?

The ADM2867E includes dedicated INVD and INVR pins that allow independent inversion of the driver and receiver signals. This corrects reversed cable connections on the A, B, Y, and Z bus pins without losing receiver fail-safe performance.

What is the maximum supported bus node count?

The device supports up to 192 bus nodes due to its 72 kΩ receiver input impedance, which reduces loading on the transmission line compared to standard 12 kΩ receivers.

Is an external isolated power supply required?

No, the ADM2867E integrates an isolated DC-to-DC converter. The VISOOUT pin provides the isolated power supply, connected to VISOIN via a ferrite bead, eliminating the need for external isolation components.