Low Noise Micropower 2.5 V and
4.096 V Precision Voltage References
ADR291/ADR292
CONNECTION DIAGRAMS
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
NC
1
2
3
4
8
7
6
5
NC
NC
V
ADR291/
ADR292
V
IN
NC
TOP VIEW
OUT
(Not to Scale)
GND
NC
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R-8)
Temperature range: −40°C to +125°C
Pin-compatible with REF02/REF19x
1
2
3
4
NC
8
7
6
5
NC
NC
ADR291/
ADR292
V
IN
NC
TOP VIEW
V
OUT
APPLICATIONS
(Not to Scale)
GND
NC
Portable instrumentation
NC = NO CONNECT
Precision reference for 3 V and 5 V systems
Analog-to-digital and digital-to-analog converter reference
Solar-powered applications
Figure 2. 8-Lead TSSOP (RU-8)
GND
Loop-current-powered instruments
V
V
IN
OUT
3
2
1
ADR291
TOP VIEW
(Not to Scale)
Figure 3. 3-Lead TO-92 (T-3)
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.
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.
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.
Table 1. ADR291/ADR292 Product
Temperature
Coefficient
Output
Initial
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
Part No.
ADR291
ADR292
Voltage (V)
Accuracy (±±)
(ppm/°C) Max
2.500
4.096
0.08, 0.12, 0.24
0.07, 0.10, 0.15
8, 15, 25
8, 15, 25
Rev. F
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007–2011 Analog Devices, Inc. All rights reserved.