ADR291ERZ-REEL7

Overview

The ADR291ERZ-REEL7 is a low noise, micropower precision voltage reference from Analog Devices. It provides a nominal output voltage of 2.5 V with an initial accuracy of ±0.08% and a maximum temperature coefficient of 8 ppm/°C. The device operates within a supply range of 2.8 V to 15 V and draws a maximum quiescent current of 15 μA across the extended industrial temperature range of −40°C to +125°C. It features a low noise output of 8 μV p-p (0.1 Hz to 10 Hz) and supports a high output current of up to 5 mA. The component is housed in an 8-lead SOIC package.

Feature Summary

• Utilizes XFET architecture for significantly lower voltage noise compared to traditional band gap references.
• Offers very low thermal hysteresis and excellent long-term stability.
• Provides high output current capability while maintaining micropower consumption.

Applications

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

Procurement Notes

Verify the specific suffix REEL7 indicates tape and reel packaging when sourcing. Confirm the E grade designation corresponds to the required 0.08% accuracy and 8 ppm/°C temperature coefficient specifications. Ensure compatibility with the 8-lead SOIC footprint during PCB layout. Check for RoHS compliance status as per manufacturer documentation.

Selection Notes

Select this part for applications requiring low noise and high precision in battery-powered devices. The 2.5 V output suits systems needing a stable reference below the supply rail. Consider the 8-lead SOIC package for surface mount assembly. Evaluate power dissipation if operating near maximum input voltage limits.

Part Context

This component belongs to the ADR291/ADR292 series of voltage references. It shares the XFET technology found in other family members but offers a distinct 2.5 V output option. The series is designed to replace older generation references like the REF02 and REF19x families while providing superior noise performance.

Replacement Considerations

Pin-compatible with REF02 and REF19x series devices. Verify pinout alignment before substitution. Electrical parameters such as noise and drift differ significantly from legacy parts.