ADR291FRZ

Overview

The ADR291FRZ is a low noise, micropower precision voltage reference from Analog Devices utilizing XFET architecture. It provides a fixed 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 of 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 low noise and ultralinear temperature drift
• Pin-compatible with REF02/REF19x legacy devices
• Capable of sourcing up to 5 mA load current
• Operates efficiently at low supply voltages starting from 2.8 V

Applications

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

Procurement Notes

Verify the specific suffix 'FRZ' corresponds to the F grade (±0.12% accuracy, 15 ppm/°C) and 8-lead SOIC package. Confirm that the ordering quantity matches the tube packaging standard of 98 units per tube as listed in the official ordering guide. Ensure compatibility with existing board layouts designed for REF02 or REF19x pinouts.

Selection Notes

Select this component when a stable 2.5 V reference is required for battery-operated or portable equipment due to its low quiescent current. Choose the F grade specifically if the design requires tighter accuracy than the G grade but does not necessitate the E grade specifications. Verify that the input voltage remains above 2.8 V to ensure proper regulation across the full operating temperature range.

Part Context

This part belongs to the ADR291/ADR292 family of precision voltage references. The ADR291 series offers a 2.5 V output, while the ADR292 provides 4.096 V. Both families share the same XFET technology and package options, including SOIC, TSSOP, and TO-92. The FRZ designation identifies the specific electrical grade and physical package configuration within this broader product line.

Replacement Considerations

The datasheet explicitly states the device is pin-compatible with REF02 and REF19x series references. Designers replacing these legacy components should verify that the lower dropout voltage and different noise characteristics of the XFET architecture meet the system requirements.