Analog Devices Inc. ADM2482EBRWZ-REEL7

Overview

ADM2482EBRWZ-REEL7 from Analog Devices is a 2.5 kV isolated RS-485 transceiver with integrated transformer driver, supporting 16 Mbps data rate, ±15 kV ESD protection on bus pins, true fail-safe receiver inputs, and dual-supply operation (3.3 V or 5 V logic side, isolated 3.3 V bus side). It enables robust half-duplex communication in industrial field networks with up to 256 nodes.

For engineers reviewing the ADM2482EBRWZ-REEL7 datasheet, ADM2482EBRWZ-REEL7 pinout, ADM2482EBRWZ-REEL7 application, or ADM2482EBRWZ-REEL7 equivalent, key selection considerations include isolation rating (2500 V rms), high-speed timing (100 ns driver propagation delay), transformer-driven isolated power architecture, and compatibility with TIA/EIA-485-A-98 and ISO 8482:1987(E) standards.

Technical Context

The ADM2482EBRWZ-REEL7 integrates iCoupler® digital isolation (3-channel), a three-state differential line driver, and a differential receiver into a single wide-body SOIC package. Its on-chip oscillator (400–600 kHz at 5 V) drives an external center-tapped transformer to generate isolated 3.3 V bus-side power.

It features active-high driver enable (DE) and active-low receiver enable (RE), thermal shutdown at 150°C, and common-mode transient immunity of 25 kV/µs. The device operates across −40°C to +85°C and supports both half-duplex (Y/Z shared with A/B via external wiring) and full-duplex configurations.

Key Specifications

Pinout & Package

Package: Wide-body 16-lead SOIC (SOIC_W), 10.3 mm × 7.5 mm body, 1.27 mm pitch, creepage/clearance ≥7.8 mm per safety standards.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar isolated RS-485 transceiver applications.

Compared with ADM2482EBRWZ-REEL7, ADM2487EBRWZ-REEL7 trades speed for lower power and cost in legacy industrial networks, while ISO3082DWR adds design complexity with external power but offers greater supply voltage flexibility and avoids transformer sourcing constraints.

Availability

ADM2482EBRWZ-REEL7 is available at Aetrix Electronics and suitable for industrial PLC backplanes, factory floor sensor networks, energy meter concentrators, motion control synchronization links, and other applications requiring stable component supply with guaranteed long-term availability.

Supply support for ADM2482EBRWZ-REEL7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The ADM2482E product line delivers isolated RS-485 communication solutions with integrated transformer drivers, targeting industrial automation systems where galvanic isolation, ESD resilience, and simplified power architecture are critical design requirements.

FAQ

What is the maximum data rate supported by the ADM2482EBRWZ-REEL7?

The ADM2482EBRWZ-REEL7 supports a maximum data rate of 16 Mbps under specified conditions (VDD1 = 5 V, RDIFF = 54 Ω, CL = 100 pF). This is confirmed in Table 2 of the Rev. B datasheet. At lower rates (e.g., 500 kbps), the device draws less current and exhibits improved thermal margin. The 16 Mbps capability makes ADM2482EBRWZ-REEL7 suitable for high-throughput industrial protocols such as EtherCAT over RS-485 physical layer extensions.

Does the ADM2482EBRWZ-REEL7 require external isolated power, or does it generate its own bus-side supply?

The ADM2482EBRWZ-REEL7 integrates an on-chip oscillator and transformer driver (pins D1/D2) that, when paired with an external center-tapped transformer and rectifier/LDO circuit, generates the required isolated 3.3 V bus-side supply (VDD2). No external isolated DC/DC converter is needed. This architecture is explicitly detailed in the "Isolated Power Supply Circuit" section (page 16) and Figure 34 of the datasheet, confirming self-contained isolated power generation for the bus domain.

How does the true fail-safe receiver in the ADM2482EBRWZ-REEL7 eliminate the need for external bias resistors?

The ADM2482EBRWZ-REEL7's receiver input threshold is guaranteed between −200 mV and −30 mV (Table 1), meaning that when the A–B differential voltage decays to 0 V during bus idle or open-circuit conditions, the receiver output (RxD) remains high. This negative threshold ensures deterministic logic state without external pull-up/pull-down resistors - a feature validated in the "True Fail-Safe Receiver Inputs" section (page 15) and confirmed by the truth table for receiving (Table 12) where open inputs yield RxD = H.

What safety certifications apply to the ADM2482EBRWZ-REEL7, and what do they cover?

The ADM2482EBRWZ-REEL7 carries UL 1577 certification (File E214100) for 2500 V rms isolation and DIN EN IEC 60747-17 (VDE 0884-17) certification (Certificate No. 40011599) for reinforced insulation with 560 V peak working voltage. These approvals cover dielectric withstand, partial discharge limits, creepage/clearance (≥7.8 mm), and material group II tracking resistance (>400 V), as documented in Tables 5 and 6 of the datasheet.

Can the ADM2482EBRWZ-REEL7 operate with a 3.3 V logic supply, and how does that affect oscillator frequency?

Yes, the ADM2482EBRWZ-REEL7 supports VDD1 = 3.3 V operation. When powered at 3.3 V, the on-chip oscillator frequency drops to 230–430 kHz (vs. 400–600 kHz at 5 V), as specified in Table 1. This lower frequency requires adjustment of the external transformer turns ratio to maintain sufficient headroom for the ADP3330 LDO to regulate VDD2 at 3.3 V - a requirement explicitly called out in the "Isolated Power Supply Circuit" section (page 16).