ADR291ERZ

Overview

The ADR291ERZ is a low noise, micropower precision voltage reference utilizing XFET architecture. It provides a fixed output of 2.5 V with an initial accuracy of ±0.08% and a maximum temperature coefficient of 8 ppm/°C. The device operates from a supply range of 2.8 V to 15 V with a maximum quiescent current of 15 μA. It supports a maximum load current of 5 mA and features low noise performance of 8 μV p-p (0.1 Hz to 10 Hz). The component is housed in an 8-lead SOIC package and functions within a temperature range of −40°C to +125°C.

Feature Summary

• XFET technology delivers significantly lower noise compared to traditional band gap references at equivalent currents.
• Ultralow thermal hysteresis ensures stable output voltage after temperature cycling.
• Micropower consumption enables extended battery life in portable instrumentation.
• Pin-compatible design allows for direct replacement of legacy REF02 and REF19x devices.

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 'ERZ' corresponds to the 8-lead SOIC package and E-grade specifications. Confirm that the ordering quantity matches the required reel or tube configuration. Ensure the application environment remains within the specified operating temperature range of −40°C to +125°C. Check for RoHS compliance status if environmental regulations apply to the final assembly.

Selection Notes

Select this part when high precision and low noise are critical for 2.5 V reference needs. The E-grade offers the tightest accuracy and lowest drift. Consider the 8-lead SOIC package for surface mount assembly. Evaluate the minimum input-output voltage differential requirements against the expected load current to ensure proper regulation.

Part Context

This component belongs to the ADR291/ADR292 family of XFET voltage references. It serves as a high-performance alternative to older band gap technologies. The family includes variants with different output voltages and accuracies. The ADR291 specifically targets 2.5 V applications requiring superior stability and low power consumption.

Replacement Considerations

The datasheet notes pin compatibility with REF02 and REF19x series devices. Verify pinout alignment before substitution. Electrical parameters such as noise and temperature coefficient may differ between generations. Ensure the replacement meets the specific accuracy grade required by the circuit design.