ADR291GRZ

Overview

The ADR291GRZ is a low noise, micropower precision voltage reference utilizing XFET architecture. It provides a fixed 2.5 V output with an initial accuracy of ±0.24% and a maximum temperature coefficient of 25 ppm/°C. The device operates from a supply range of 2.8 V to 15 V with a typical quiescent current of 12 μA. It features a low noise output of 8 μV p-p (0.1 Hz to 10 Hz) and supports up to 5 mA load current. Packaged in an 8-lead SOIC, it functions within an extended industrial temperature range of −40°C to +125°C.

Feature Summary

• XFET architecture delivers significantly lower voltage noise compared to traditional band gap references at equivalent currents.
• Ultralow thermal hysteresis and excellent long-term stability ensure consistent performance over time and temperature cycles.
• High output drive capability allows sourcing up to 5 mA while maintaining tight regulation specifications.

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 electrical grade matches the required initial accuracy and temperature coefficient for the target application. Confirm RoHS compliance status and check for any recent product change notices that may affect pinout or specifications.

Selection Notes

Select this component when a stable 2.5 V reference is needed with minimal power consumption. The G-grade offers the widest operating temperature range but requires verification of the higher temperature coefficient. Consider the 8-lead SOIC package for standard surface mount assembly processes and adequate thermal dissipation characteristics.

Part Context

This part belongs to the ADR291/ADR292 family of precision voltage references. It serves as a direct replacement for older REF02 and REF19x series devices due to pin compatibility. The family utilizes advanced XFET technology to achieve superior noise and drift performance compared to conventional band gap designs.

Replacement Considerations

Pin-compatible alternatives include the REF02 and REF19x series. Verify that substitute components meet the specific 2.5 V output requirement and match the 8-lead SOIC footprint for direct board integration without schematic modifications.