ADM2485BRWZ: High-Speed, Half-Duplex Isolated RS-485 Transceiver with iCoupler® Technology

The ADM2485BRWZ is a robust, integrated isolated RS-485 transceiver designed by Analog Devices, Inc. (ADI) for reliable bidirectional data communication in industrial, automotive, and harsh-environment applications. Leveraging ADI's patented iCoupler® magnetic isolation technology, this device eliminates the limitations of traditional optocouplers while providing superior performance, safety, and reliability.

Key Features

1. iCoupler® Magnetic Isolation

• Provides 2.5 kV rms galvanic isolation between the logic interface and bus lines, ensuring noise immunity and protection against high-voltage transients.
• Meets UL 1577 (1 minute, 2500 V rms) and VDE V 0884-10 (reinforced insulation, 560 V peak VIORM) safety standards.

1. High-Speed Data Transmission

• Supports data rates up to 16 Mbps, enabling fast communication in PROFIBUS®, Modbus®, and other industrial networks.
• Half-duplex operation with 50-node bus capability, ideal for multipoint data transmission systems.

1. Wide Supply Voltage Range

• Operates on 3.3 V or 5 V logic supply (VDD1) and 5 V isolated bus supply (VDD2), offering flexibility in mixed-voltage designs.
• Low power consumption (75 mA typical at 5 V) reduces thermal stress and extends battery life in portable applications.

1. Robust Electromagnetic Performance

• >25 kV/μs common-mode transient immunity (CMTI) ensures reliable operation in noisy industrial environments.
• Integrated protection against ESD (±15 kV HBM), short-circuit, and thermal shutdown enhances system robustness.

1. Compact and Integrated Design

• Combines a 3-channel isolator, differential driver, and differential receiver in a single 16-lead SOIC package, saving PCB space and reducing BOM complexity.
• Surface-mount (SMD/SMT) compatibility simplifies automated assembly.

1. Industrial Temperature Range

• Fully operational from -40°C to +85°C, making it suitable for automotive, outdoor, and factory-floor deployments.

Applications

• Industrial Automation:
• PROFIBUS® and Modbus® networks
• Programmable logic controllers (PLCs)
• Distributed control systems (DCS)
• Automotive Electronics:
• Battery management systems (BMS)
• Engine control units (ECUs)
• In-vehicle networking (CAN/RS-485 hybrid)
• Energy & Utilities:
• Smart grid meters
• Solar inverter monitoring
• Wind turbine control
• Medical & Instrumentation:
• Patient monitoring equipment
• Industrial imaging systems
• Test and measurement devices

Advantages Over Competitors

• Superior Isolation Performance: Unlike optocouplers, iCoupler® technology offers no degradation over time, lower power, and higher reliability.
• Higher Data Rate: 16 Mbps throughput exceeds many competing isolated RS-485 transceivers.
• Smaller Footprint: 16-lead SOIC package is more compact than DIP or multi-component solutions.
• Industrial-Grade Certifications: Meets strict safety and EMC standards for global deployment.

Conclusion

The ADM2485BRWZ is an ideal choice for designers seeking a high-speed, isolated RS-485 transceiver with industry-leading noise immunity and rugged reliability. Its integration of isolation, drivers, and receivers in a single package simplifies design while reducing cost and board space. Whether for industrial automation, automotive, or energy applications, the ADM2485BRWZ delivers unmatched performance in harsh environments.

For evaluation, ADI offers the EVAL-ADM2485EBZ assessment board, enabling quick prototyping and system verification.