GENERAL DESCRIPTION

The ADR291 and ADR292 are low noise, micropower precision voltage references that use an XFET® reference circuit. The new XFET architecture offers significant performance improvements over traditional band gap and buried Zener-based references. Improvements include one quarter the voltage noise output of band gap references operating at the same current, very low and ultralinear temperature drift, low thermal hysteresis, and excellent long-term stability.

The ADR291/ADR292 family is a series of voltage references providing stable and accurate output voltages from supplies as low as 2.8 V for the ADR291. Output voltage options are 2.5 V and 4.096 V for the ADR291 and ADR292, respectively.

FEATURES

  Supply range

     2.8 V to 15 V, ADR291

     4.4 V to 15 V, ADR292

  Supply current: 15 μA maximum

  Low noise: 8 μV and 12 μV p-p (0.1 Hz to 10 Hz)

  High output current: 5 mA

  Temperature range: −40°C to +125°C

  Pin-compatible with REF02/REF19x

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