PIN CONFIGURATIONS

8-Lead Narrow Body SO (SO Suffix)

1

2

3

4

8

7

6

5

GND

NC

NC

NC

NC

NC

ADR29x

TOP VIEW

(Not to Scale)

NC = NO CONNECT

8-Lead TSSOP (RU Suffix)

1

2

3

4

8

7

6

5

GND

NC

NC

NC

NC

NC

ADR29x

TOP VIEW

(Not to Scale)

NC = NO CONNECT

REV. B

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

which may result from its use. No license is granted by implication or

otherwise under any patent or patent rights of Analog Devices.

a

Low Noise Micropower

2.048 V, 2.5 V, and 4.096 V

Precision Voltage References

ADR290/ADR291/ADR292

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781/329-4700

World Wide Web Site: http://www.analog.com

Fax: 781/326-8703

© Analog Devices, Inc., 2001

FEATURES

Supply Range

2.35 V to 15 V, ADR290

2.8 V to 15 V, ADR291

4.4 V to 15 V, ADR292

Supply Current 12

A Max

Low-Noise 6

V, 8

V, 12

V p-p (0.1 Hz–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

A/D and D/A Converter Reference

Solar-Powered Applications

Loop-Current-Powered Instruments

GENERAL DESCRIPTION

The ADR290, ADR291 and ADR292 are low noise, micro-

circuit. The new XFET architecture offers significant perfor-

mance improvements over traditional bandgap and Buried

Zener-based references. Improvements include: one quarter the

voltage noise output of bandgap references operating at the

same current, very low and ultralinear temperature drift, low

thermal hysteresis and excellent long-term stability.

The ADR29x family are series voltage references providing stable

and accurate output voltages from supplies as low as 2.35 V for the

ADR290. Output voltage options are 2.048 V, 2.5 V, and 4.096 V

for the ADR290, ADR291, and ADR292 respectively. Quiescent

XFET is a registered trademark of Analog Devices, Inc.

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

max for the ADR290 and ADR291, and

± 3 mV, ±4 mV and

±6 mV max for the ADR292. Temperature coefficients for the

three grades are 8 ppm/

°C, 15 ppm/°C, and 25 ppm/°C max,

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 ADR290, 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 and 8-lead

TSSOP packages.

ADR29x Product

Output Voltage

Initial Accuracy

Temperature Coefficient

Part Number

(V)

(%)

(ppm/ C) Max

ADR290

2.048

0.10, 0.15, 0.29

8, 15, 25

ADR291

2.500

0.08, 0.12, 0.24

8, 15, 25

ADR292

4.096

0.07, 0.10, 0.15

8, 15, 25

ADR293

5.000

(See ADR293 Data Sheet)