ADR291 Analog Devices, ADR291 Datasheet

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ADR291

Manufacturer Part Number
ADR291
Description
Precision, Micropower 2.5 V XFET(TM) Reference
Manufacturer
Analog Devices
Datasheet

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FEATURES
Supply range
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
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
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.
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
Rev. E
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 registered trademarks are the property of their respective owners.
2.8 V to 15 V, ADR291
4.4 V to 15 V, ADR292
REF02/REF19x
4.096 V Precision Voltage References
Low Noise Micropower 2.5 V and
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
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.
Table 1. ADR291/ADR292 Product
Part No.
ADR291
ADR292
Output
Voltage (V)
2.500
4.096
CONNECTION DIAGRAMS
GND
GND
NC
V
NC
V
NC
NC
IN
Figure 2. 8-Lead TSSOP (RU-8)
IN
Figure 3. 3-Lead TO-92 (T-3)
Figure 1. 8-Lead SOIC (R-8)
V
OUT
1
2
3
4
1
2
3
4
NC = NO CONNECT
NC = NO CONNECT
©2007 Analog Devices, Inc. All rights reserved.
(Not to Scale)
(Not to Scale)
(Not to Scale)
ADR291/
ADR291/
ADR292
TOP VIEW
ADR292
TOP VIEW
3
TOP VIEW
ADR291
Initial
Accuracy (±%)
0.08, 0.12, 0.24
0.07, 0.10, 0.15
ADR291/ADR292
GND
2
1
8
7
6
5
V
7
6
5
8
IN
NC
NC
V
NC
NC
NC
V
NC
OUT
OUT
Temperature
Coefficient
(ppm/°C) Max
8, 15, 25
8, 15, 25
www.analog.com

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ADR291 Summary of contents

Page 1

... 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 ± ...

Page 2

... ADR291/ADR292 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Connection Diagrams...................................................................... 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 ADR291 Electrical Specifications............................................... 3 ADR292 Electrical Specifications............................................... 4 Absolute Maximum Ratings............................................................ 6 ESD Caution.................................................................................. 6 Pin Configurations and Function Descriptions ........................... 7 Typical Performance Characteristics ............................................. 8 Terminology .................................................................................... 12 Theory of Operation ...................................................................... 13 REVISION HISTORY 12/07—Rev Rev. E Changes to Features.......................................................................... 1 Changes to Figure 34...................................................................... 14 3/06— ...

Page 3

... SPECIFICATIONS ADR291 ELECTRICAL SPECIFICATIONS 25°C, unless otherwise noted Table 2. Parameter Symbol E GRADE Output Voltage V OUT Initial Accuracy V OERR F GRADE Output Voltage V OUT Initial Accuracy V OERR G GRADE Output Voltage V OUT Initial Accuracy V OERR LINE REGULATION E/F Grades ∆V OUT ...

Page 4

... ADR291/ADR292 −40°C to+125°C, unless otherwise noted Table 4. Parameter TEMPERATURE COEFFICIENT E Grade F Grade G Grade LINE REGULATION E/F Grades G Grade LOAD REGULATION E/F Grades G Grade SUPPLY CURRENT THERMAL HYSTERESIS ADR292 ELECTRICAL SPECIFICATIONS 25°C, unless otherwise noted. ...

Page 5

... OUT LOAD S OUT 25° −40°C ≤ T ≤ +125° 8-lead SOIC, 8-lead TSSOP OUT-HYS Rev Page ADR291/ADR292 Min Typ Max 125 50 150 20 125 30 150 Min Typ ...

Page 6

... Supply Voltage Output Short-Circuit Duration to GND Storage Temperature Range Packages Operating Temperature Range ADR291/ADR292 Junction Temperature Range Packages Lead Temperature (Soldering, 60 sec) Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only ...

Page 7

... OUT (Not to Scale) GND CONNECT Figure 5. 8-Lead TSSOP (RU-8) TO-92 Mnemonic N GND 3 V OUT Rev Page ADR291/ADR292 GND V V OUT ADR291 TOP VIEW (Not to Scale) Figure 6. 3-Lead TO-92 (T-3) Description No Connect Input Voltage Ground Output Voltage ...

Page 8

... +25° –40° INPUT VOLTAGE (V) Figure 9. ADR291 Quiescent Current vs. Input Voltage 14 3 TYPICAL PARTS 100 125 14 3 TYPICAL PARTS 100 125 Figure 11. ADR291/ADR292 Supply Current vs. Temperature 100 ...

Page 9

... LOAD CURRENT (mA) Figure 15. ADR292 Minimum Input-Output Voltage Differential vs. Load Current 200 OUT 160 120 80 40 ADR292 0 100 125 –50 Figure 16. ADR291 Load Regulation vs. Temperature 200 160 120 –50 4.0 4.5 5.0 Figure 17. ADR292 Load Regulation vs. Temperature 0 –250 –500 –750 –1000 –1250 –1500 – ...

Page 10

... T = +25° +125° μ 15V 25°C A 1000 1000 Rev Page 100 Figure 22. ADR291 0 Noise 100 1k FREQUENCY (Hz) Figure 23. ADR291 Output Impedance vs. Frequency ...

Page 11

... Rev Page ADR291/ADR292 500 μ 5mA L 1V Figure 28. ADR291 Turn-On Time I = 0mA 10ms L 1V Figure 29. ADR291 Turn-Off Time TEMPERATURE +25 °C ≥ –40°C ≥ +85°C ≥ +25°C V DEVIATION (ppm) OUT Figure 30. Typical Hysteresis for the ADR291 Product ...

Page 12

... ADR291/ADR292 TERMINOLOGY Line Regulation Line regulation refers to the change in output voltage due to a specified change in input voltage. It includes the effects of self- heating. Line regulation is expressed as percent-per-volt, parts- per-million-per-volt, or microvolts-per-volt change in input voltage. Load Regulation The change in output voltage is due to a specified change in load current and includes the effects of self-heating ...

Page 13

... the positive temperature coefficient correction current. PTAT The various versions of the ADR291/ADR292 family are created by on-chip adjustment of R1 and R3 to achieve 2.500 V or 4.096 V at the reference output. The process used for the XFET reference also features vertical NPN and PNP transistors, the latter of which are used as output devices to provide a very low dropout voltage ...

Page 14

... PRECISION CURRENT SOURCE In low power applications, there is often a need for a precision current source that can operate on low supply voltages. As shown in Figure 34, any one of the devices in the ADR291/ ADR292 family of references can be configured as a precision current source. The circuit configuration illustrated is a floating current source with a grounded load. The reference’ ...

Page 15

... ADR291/ADR292, make it ideal for low power applica- tions such as handheld, battery-operated equipment. One such ADC for which the ADR291 is well suited is the AD7701. Figure 37 shows the ADR291 used as the reference for this converter. The AD7701 is a 16-bit ADC with on-chip ...

Page 16

... ADR291/ADR292 OUTLINE DIMENSIONS 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497) 4 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 0.25 (0.0098) 0.10 (0.0040) 0.51 (0.0201) COPLANARITY 0.10 0.31 (0.0122) 0.25 (0.0098) SEATING PLANE 0.17 (0.0067) COMPLIANT TO JEDEC STANDARDS MS-012-A A CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS (IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN. ...

Page 17

... ADR291ERZ 1 2.50 1 ADR291ERZ-REEL7 2.50 ADR291FR 2.50 ADR291FR-REEL 2.50 ADR291FR-REEL7 2.50 1 ADR291FRZ 2.50 1 ADR291FRZ-REEL 2.50 1 ADR291FRZ-REEL7 2.50 ADR291GR 2.50 ADR291GR-REEL 2.50 ADR291GR-REEL7 2.50 1 ADR291GRZ 2.50 1 ADR291GRZ-REEL 2.50 1 ADR291GRZ-REEL7 2.50 ADR291GRU 2.50 ADR291GRU-REEL7 2.50 1 ADR291GRUZ 2.50 1 ADR291GRUZ-REEL 2.50 ADR291GRUZ-REEL7 1 2.50 ADR291GT9 2.50 ADR291GT9-REEL 2.50 1 ADR291GT9Z 2.50 ADR292ER 4.096 ADR292ER-REEL 4.096 1 ADR292ERZ 4.096 1 ADR292ERZ-REEL 4.096 ADR292FR 4.096 ADR292FR-REEL 4.096 ADR292FR-REEL7 4.096 1 ADR292FRZ 4.096 1 ADR292FRZ-REEL 4.096 ...

Page 18

... ADR291/ADR292 NOTES Rev Page ...

Page 19

... NOTES Rev Page ADR291/ADR292 ...

Page 20

... ADR291/ADR292 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D00163-0-12/07(E) Rev Page ...

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