ADM2863EBRNZ

Overview

The ADM2863EBRNZ is a half-duplex RS-485 transceiver featuring 5.7 kV RMS signal and power isolation with an integrated dc-to-dc converter. It operates at a maximum data rate of 500 kbps to control electromagnetic interference. The device supports a primary supply voltage (VCC) from 3 V to 5.5 V and a flexible logic I/O supply (VIO) from 1.7 V to 5.5 V. It provides ±12 kV contact and ±15 kV air IEC ESD protection on bus pins, high common-mode transient immunity of 250 kV/µs, and full hot-swap support. The component is housed in a 28-lead fine pitch SOIC_W package.

Feature Summary

• Integrated isolated dc-to-dc converter eliminates the need for external isolated power supplies.
• Cable invert feature allows correction of reversed A/B/Y/Z cable connections while maintaining receiver fail-safe performance.
• Passes EN 55032 Class B radiated emissions testing with margin on a standard two-layer PCB.
• Supports up to 192 bus nodes with 72 kΩ receiver input impedance.

Applications

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

Procurement Notes

Verify the specific ordering suffix against official Analog Devices documentation to confirm package type and tape-and-reel specifications. Ensure compliance with humidity sensitivity levels and storage conditions prior to assembly. Confirm that the procurement channel provides valid traceability for safety-related insulation approvals such as UL 1577 and IEC 62368-1.

Selection Notes

Select this model when low-speed communication up to 500 kbps is required to minimize electromagnetic interference. Choose this variant over higher-speed options if the application demands robust ESD protection on all bus terminals and simplified board design by removing external isolated power components. Verify that the logic interface voltage range matches the system's microcontroller or processor requirements.

Part Context

This component belongs to the ADM286x family of isolated RS-485 transceivers. It shares the same physical footprint and isolation architecture with the ADM2861E, ADM2865E, and ADM2867E. The primary distinction lies in the data rate capability; this specific part is optimized for lower speeds compared to the 25 Mbps variants within the same series.

Replacement Considerations

ADM2861EBRNZ: Identical half-duplex form factor with equivalent electrical characteristics and pinout compatibility.

FAQ

How does the Cable Invert feature function?

The Cable Invert feature allows the user to correct reversed cable connections on the A, B, Y, and Z bus pins. This is achieved via dedicated INVR and INVD pins that invert the receiver and driver signals respectively, ensuring proper communication without rewiring while maintaining full receiver fail-safe performance.

What are the supported isolation voltage ratings?

The device provides 5.7 kV rms basic insulation rating per UL 1577. For reinforced insulation under DIN EN IEC 60747-17, it supports a maximum working insulation voltage (VIORM) of 400 V rms and a maximum repetitive isolation voltage (VIOWM) of 565 V peak.

Can the device be powered directly from a 5 V source?

Yes, the VCC supply accepts 3.0 V to 5.5 V. Additionally, the VSEL pin can be configured to set the internal isolated supply (VISO) to 5.0 V when VCC is greater than 4.5 V, making it compatible with PROFIBUS standards requiring 5 V isolated power.