AD261AND-3

Overview

The AD261AND-3 is a high-speed logic isolator designed to isolate five digital control signals between a microcontroller and field I/O components. It features a minimum signal bandwidth of 20 MHz and a propagation delay of 14 ns. The device supports up to 3.5 kVrms isolation test voltage and offers a common-mode transient immunity of 10 kV/ms minimum. It operates within a temperature range of -25°C to +85°C and includes two enable pins for three-state output control.

Feature Summary

• Provides electrical isolation for five digital logic lines with high-speed data transmission capabilities.
• Maintains waveform edge symmetry within ±1 ns to accurately isolate time-based PWM signals.
• Features independent enable controls allowing outputs to be set to a high-resistance three-state level.

Applications

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

Procurement Notes

Verify the specific suffix AND-3 against official Analog Devices documentation to confirm pinout and configuration compatibility. Ensure environmental ratings meet system requirements. Confirm current availability status through authorized channels as supply conditions may vary.

Selection Notes

Select this component when replacing multiple discrete opto-isolators with a single integrated solution. It is suitable for applications requiring precise timing preservation in PWM signals. Consider the package type and operating temperature range during integration.

Part Context

The AD261 series consists of six models offering various input/output combinations. The AD261AND-3 specifically provides a defined configuration within this family. It effectively replaces up to five individual opto-isolators, simplifying circuit design and reducing board space requirements for digital isolation tasks.

Replacement Considerations

Check datasheet for pin-compatible alternatives within the AD261 family. Verify that substitute devices support the required 20 MHz bandwidth and 3.5 kVrms isolation rating.

FAQ

How does the AD261 handle PWM signal isolation?

Output waveform symmetry is maintained to within ±1 ns of the input, allowing the device to accurately isolate time-based PWM signals without significant distortion.

What is the maximum isolation voltage rating?

The device has an isolation test voltage rating of up to 3.5 kVrms.