ADR291GRU

Overview

The ADR291GRU 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. The component is housed in an 8-lead TSSOP package and 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
• Supports high output current capability up to 5 mA
• Offers pin compatibility with REF02 and REF19x families

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 'GRU' against official Analog Devices documentation to confirm the exact grade, package type, and packaging option. Ensure the ordering information matches the required electrical specifications for your design. Cross-reference the datasheet revision history for any updates to the ordering guide or performance characteristics before finalizing procurement.

Selection Notes

Select this component when a stable 2.5 V reference is needed with moderate accuracy requirements. The G-grade offers a balance of cost and performance suitable for general-purpose applications. Consider the 8-lead TSSOP package for surface-mount designs requiring space efficiency. Verify that the input voltage remains within the specified operating range to ensure proper regulation.

Part Context

The ADR291 series belongs to Analog Devices' family of low noise, micropower precision voltage references. These devices are designed to replace traditional band gap and buried Zener-based references, offering significant improvements in noise performance and thermal stability. The ADR291 specifically provides a 2.5 V output, while the ADR292 variant offers 4.096 V.

Replacement Considerations

The datasheet indicates pin-compatible alternatives such as the REF02 and REF19x series. Designers should verify electrical parameter alignment, particularly regarding noise levels and temperature coefficients, when substituting these legacy components.