ADM2795EARWZ-RL7

Overview

The ADM2795EARWZ-RL7 is a robust, 5 kV rms isolated RS-485/RS-422 transceiver manufactured by Analog Devices Inc. It integrates iCoupler technology to combine a three-channel isolator with certified Level 4 IEC electromagnetic compatibility (EMC) transient protection and full ±42 V AC/DC peak bus overvoltage fault protection in a single package. The device supports data rates up to 2.5 Mbps and operates across an extended temperature range of −40°C to +125°C. It features a flexible logic supply voltage range from 1.7 V to 5.5 V on VDD1, while the bus side operates between 3 V and 5.5 V on VDD2. Packaged in a 16-lead wide-body SOIC, it provides high common-mode transient immunity exceeding 75 kV/μs.

Feature Summary

• Integrates certified Level 4 IEC EMC protection including surge, electrical fast transient, and electrostatic discharge capabilities directly on the RS-485 A and B bus pins without requiring external components.
• Provides comprehensive ±42 V AC/DC peak fault protection on the RS-485 bus pins, safeguarding against miswiring and short circuits within the specified operating range.
• Utilizes iCoupler magnetic isolation technology to deliver 5 kV rms signal isolation combined with a three-channel digital isolator for enhanced noise immunity and system reliability.

Applications

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

Procurement Notes

Verify that the specific ordering suffix RL7 corresponds to the reel packaging format required for your assembly line. Confirm that the component meets all necessary regional safety certifications, such as UL 1577 and DIN EN IEC 60747-17, for your intended deployment environment. Ensure proper handling precautions are observed due to the device's sensitivity to electrostatic discharge during storage and installation.

Selection Notes

Select this component when designing RS-485 or RS-422 interfaces that require strict compliance with IEC 61000-4-x standards without adding discrete protection circuitry. It is suitable for applications demanding high common-mode voltage tolerance up to ±25 V and operation with low-voltage logic supplies down to 1.7 V. Consider its thermal characteristics and wide-body SOIC footprint constraints during the printed circuit board layout phase.

Part Context

This part belongs to the ADM2795E series of isolated RS-485 transceivers designed for harsh industrial environments. The series distinguishes itself by integrating certified IEC EMC protection and high-voltage fault tolerance directly into the silicon, eliminating the need for bulky external transient voltage suppressors. It represents a consolidated solution for designers seeking to reduce bill-of-materials complexity and improve system robustness against electrical faults.

Replacement Considerations

Direct functional replacements include the non-isolated ADM3095E series, which offers similar EMC protection but lacks galvanic isolation. Designers must account for the absence of the 5 kV rms isolation barrier when substituting these parts. Verify that any alternative component maintains the required ±42 V fault protection and Level 4 IEC certification if those specifications are critical to the application.

FAQ

Does the ADM2795E require external components for IEC 61000-4-5 surge protection?

No, the device integrates certified Level 4 IEC 61000-4-5 surge protection capable of withstanding ±4 kV directly on the RS-485 bus pins, removing the need for external transient voltage suppressors.

What is the maximum common-mode input voltage range supported by this transceiver?

The ADM2795E supports an extended common-mode input range of −25 V to +25 V, ensuring reliable data communication in electrically noisy environments.

How does the device handle power-up and power-down sequences?

The transceiver features glitch-free power-up and power-down capabilities, allowing for hot swap functionality without generating erroneous signals on the bus.