AD261BND-2

Overview

The AD261BND-2 is a high-speed logic isolator designed to isolate five digital control signals between a microcontroller and field I/O components. It features six models offering various input/output configurations, with this specific variant providing five inputs and two outputs. The device utilizes magnetic coupling technology to achieve an isolation test voltage of 3.5 kVrms. Each isolated channel provides a minimum bandwidth of 20 MHz and a propagation delay of 14 ns. Waveform edge transmission symmetry is maintained within ±1 ns, ensuring accurate isolation of time-based PWM signals. The component operates over a temperature range of -25°C to +85°C.

Feature Summary

• Provides robust isolation for five digital control signals using magnetic coupling technology
• Maintains waveform edge transmission symmetry within ±1 ns for precise PWM signal handling
• Features independent enable/three-state functions for system-side multiplexing and power-up presetting
• Replaces up to five discrete opto-isolators in a single integrated package

Applications

• PLC and DCS analog input and output cards
• IGBT motor drive controls
• High-speed digital I/O ports
• Communications bus isolation

Procurement Notes

Verify the specific suffix configuration against the official Analog Devices datasheet to confirm the exact input/output pinout, as the AD261 series includes multiple variants. Confirm that the obsolete status does not impact long-term supply chain requirements. Ensure compatibility with existing PCB footprints and thermal management solutions before finalizing procurement decisions.

Selection Notes

Select this component when designing systems requiring high-speed isolation for multiple digital lines without the latency associated with optical couplers. The low propagation delay and high common-mode transient immunity make it suitable for applications demanding precise timing synchronization. Consider the available I/O configurations to match the specific microcontroller-to-field interface requirements.

Part Context

The AD261 series represents a family of high-speed logic isolators from Analog Devices. These devices are engineered to replace traditional opto-isolators by offering faster data rates and better symmetry. The series supports various I/O combinations, allowing designers to optimize board space and cost while maintaining strict electrical isolation standards for industrial and communication applications.

Replacement Considerations

Direct replacements may include other AD261 variants with different I/O counts or updated suffixes if available. Verify pin compatibility and isolation ratings when substituting with similar high-speed isolators from other manufacturers.