This document describes the features and characteristics of the ADR291/ADR292 series low noise micropower 2.5 V and 4.096 V precision voltage references.
The ADR291 and ADR292 are low‑noise, micropower precision voltage references that use an XFET® reference circuit. They offer very low voltage noise, ultra‑linear temperature drift, and excellent long‑term stability, making them suitable for battery‑powered instrumentation and precision reference applications.
The document includes detailed electrical specifications, absolute maximum ratings, pin‑out diagrams for SOIC, TSSOP and TO‑92 packages, typical performance curves, and application notes such as precision current sources and Kelvin connections.
| Supply voltage range (ADR291) | 2.8 V to 15 V |
|---|---|
| Supply voltage range (ADR292) | 4.4 V to 15 V |
| Supply current (max) | 15 pA |
| Quiescent current | 12 µA |
| Low noise (0.1 Hz‑10 Hz) | 8 pV‑12 pV p‑p |
| Output voltage options | 2.5 V (ADR291) / 4.096 V (ADR292) |
| Operating temperature range | –40 °C to +125 °C |
| Initial accuracy (E‑grade) | ±0.08 % |
The ADR291 operates from 2.8 V up to 15 V.
The devices have a quiescent current of about 12 µA.
They are offered in 8‑lead SOIC, 8‑lead TSSOP, and 3‑lead TO‑92 packages.
They are specified for –40 °C to +125 °C operation.