ADR291FR

Overview

The ADR291FRZ is a low noise, micropower precision voltage reference from Analog Devices utilizing XFET architecture. It provides a stable 2.5 V output with an initial accuracy of ±0.12% and a maximum temperature coefficient of 15 ppm/°C. The device operates on a supply range of 2.8 V to 15 V with a typical quiescent current of 12 μA. It features low noise (8 μV p-p) and high output current capability up to 5 mA. Packaged in an 8-lead SOIC, it functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• Utilizes XFET architecture for ultralow thermal hysteresis and excellent long-term stability.
• Delivers high output current capability up to 5 mA while maintaining low quiescent power consumption.
• Offers pin-compatible replacement options for legacy REF02 and REF19x series references.

Applications

• Portable instrumentation
• Precision reference for 3 V and 5 V systems
• Analog-to-digital and digital-to-analog converter reference

Procurement Notes

Verify the specific suffix against the manufacturer's ordering guide to confirm package type and reel quantity. Ensure the selected grade meets the required initial accuracy and temperature coefficient specifications for the target application environment. Cross-reference the datasheet revision to confirm electrical parameters remain unchanged.

Selection Notes

Select this component when low noise and micropower operation are critical requirements. The 2.5 V output is suitable for single-supply systems operating at 3 V or higher. Consider the 8-lead SOIC package for surface mount assembly needs. Evaluate the thermal resistance characteristics if the device will operate near the upper temperature limits.

Part Context

This part belongs to the ADR291/ADR292 family of precision voltage references. The ADR291 variant specifically provides a 2.5 V output, whereas the ADR292 provides 4.096 V. Both share the same XFET-based core technology and package options, differing primarily in their nominal output voltage settings.

Replacement Considerations

Pin-compatible alternatives include the REF02 and REF19x series. Verify that substitute components meet the specific noise density and temperature coefficient requirements of the original design.

FAQ

What is the minimum input voltage required for the ADR291?

The ADR291 requires a minimum supply voltage of 2.8 V to function correctly.

How does the XFET architecture improve performance compared to band gap references?

XFET technology offers significantly lower voltage noise output, very low thermal hysteresis, and improved long-term stability compared to traditional band gap designs.