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.
Quiescent current is only 12 μA, making these devices ideal for battery-powered instrumentation. Three electrical grades are available offering initial output accuracies of ±2 mV, ±3 mV, and ±6 mV maximum for the ADR291, and ±3 mV, ±4 mV, and ±6 mV maximum for the ADR292. Temperature coefficients for the three grades are 8 ppm/°C, 15 ppm/°C, and 25 ppm/°C maximum, respectively. Line regulation and load regulation are typically 30 ppm/V and 30 ppm/mA, maintaining the reference’s overall high performance. For a device with 5.0 V output, refer to the ADR293 data sheet.
The ADR291 and ADR292 references are specified over the extended industrial temperature range of −40°C to +125°C. Devices are available in the 8-lead SOIC, 8-lead TSSOP, and 3-lead TO-92 packages.
|Title||Content Type||File Type|
|ADR291/ADR292: Low Noise Micropower 2.5 V and 4.096 V Precision Voltage References Data Sheet (Rev F, 05/2011) (pdf, 466 kB)||Data Sheets|
|ADR291W: Low Noise Micropower 2.5 V Precision Voltage Reference Data Sheet (Rev 0, 03/2010) (pdf, 124 kB)||Data Sheets|
|AN-713: The Effect of Long-Term Drift on Voltage References (pdf, 237 kB)||Application Notes|
|CN-0234: Single Supply, Micropower Toxic Gas Detector Using an Electrochemical Sensor (pdf, 386 kB)||Circuit Note|
(Analog Dialogue, Vol. 32, No. 1, 1998)
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|What do I need to know about selecting and using Voltage References?||FAQs/RAQs||HTML|
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|Voltage Reference Selection & Evaluation Wizard||Design Calculators||HTML|
Voltage Reference Wizard (downloadable)
This Wizard helps you select the most suitable voltage for a use with a data converter. Supply the Wizard with a given data converter; it will provide you with a number of suitable references plus the maximum DC error contributed to your overall system. Or enter the amount of DC error your system can tolerate and find out which of ADI’s reference and data converter pairs will meet your requirement.
Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.
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