Micropower, Low Noise Precision Voltage
References with Shutdown
ADR391/ADR392/ADR395
FEATURES
Compact 5-lead TSOT package
Low temperature coefficient
B grade: 9 ppm/°C
A grade: 25 ppm/°C
Initial accuracy
B grade: ±4 mV maximum (ADR391)
A grade: ±6 mV maximum
Ultralow output noise: 5 μV p-p (0.1 Hz to 10 Hz)
Low dropout: 300 mV
Low supply current
3 μA maximum in shutdown
140 μA maximum in operation
No external capacitor required
Output current: 5 mA
Automotive grade available
Wide temperature range: −40°C to +125°C
PIN CONFIGURATION
SHDN
1
V
IN 2
V
OUT (SENSE) 3
(Not to Scale)
4
V
OUT (FORCE)
Figure 1. 5-Lead TSOT (UJ Suffix)
Table 1.
Model
ADR391B
ADR391A
ADR392B
ADR392A
ADR395B
ADR395A
Output
Voltage (V
O
)
2.5
2.5
4.096
4.096
5.0
5.0
Temperature
Coefficient (ppm/°C)
9
25
9
25
9
25
Accuracy
(mV)
±4
±6
±5
±6
±5
±6
APPLICATIONS
Battery-powered instrumentation
Portable medical instrumentation
Data acquisition systems
Industrial process controls
Automotive
GENERAL DESCRIPTION
The ADR391/ADR392/ADR395 are precision 2.048 V, 2.5 V,
4.096 V, and 5 V band gap voltage references, respectively,
featuring low power and high precision in a tiny footprint. Using
patented temperature drift curvature correction techniques
from Analog Devices, Inc., the ADR39x references achieve a
low 9 ppm/°C of temperature drift in the TSOT package.
The ADR39x family of micropower, low dropout voltage references
provides a stable output voltage from a minimum supply of
300 mV above the output. Their advanced design eliminates the
need for external capacitors, which further reduces board space
and system cost. The combination of low power operation,
small size, and ease of use makes the ADR39x precision voltage
references ideally suited for battery-operated applications.
Rev. H
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.
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 ©2002–2009 Analog Devices, Inc. All rights reserved.
00419-001
ADR391/
ADR392/
ADR395
5
GND
ADR391/ADR392/ADR395
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR391 Electrical Characteristics............................................. 3
ADR392 Electrical Characteristics............................................. 4
ADR395 Electrical Characteristics............................................. 5
Absolute Maximum Ratings............................................................ 6
Thermal Resistance ...................................................................... 6
ESD Caution...................................................................................6
Typical Performance Characteristics ..............................................7
Terminology .................................................................................... 13
Theory of Operation ...................................................................... 14
Device Power Dissipation Considerations .............................. 14
Shutdown Mode Operation ...................................................... 14
Applications Information .............................................................. 15
Basic Voltage Reference Connection ....................................... 15
Capacitors .................................................................................... 17
Outline Dimensions ....................................................................... 18
Ordering Guide .......................................................................... 18
Changes to ADR392—Specifications .............................................5
Changes to ADR395—Specifications .............................................6
Changes to Absolute Maximum Ratings ........................................7
Changes to Thermal Resistance.......................................................7
Moved ESD Caution..........................................................................7
Changes to Figure 3, Figure 4, Figure 7, and Figure 8 ..................9
Changes to Figure 11, Figure 12, Figure 13, and Figure 14....... 10
Changes to Figure 15, Figure 16, Figure 19, and Figure 20....... 11
Changes to Figure 23 and Figure 24............................................. 12
Changes to Figure 27...................................................................... 13
Changes to Ordering Guide .......................................................... 19
Updated Outline Dimensions ....................................................... 19
10/02—Rev. B to Rev. C
Add parts ADR392 and ADR395 ..................................... Universal
Changes to Features ..........................................................................1
Changes to General Description .....................................................1
Additions to Table I ...........................................................................1
Changes to Specifications .................................................................2
Changes to Ordering Guide .............................................................4
Changes to Absolute Maximum Ratings ........................................4
New TPCs 3, 4, 7, 8, 11, 12, 15, 16, 19, and 20 ..............................6
New Figures 4 and 5 ....................................................................... 13
Deleted A Negative Precision Reference
without Precision Resistors Section ............................................. 13
Edits to General-Purpose Current Source Section .................... 13
Updated Outline Dimensions ....................................................... 15
5/02—Rev. A to Rev. B
Edits to Layout .................................................................... Universal
Changes to Figure 6 ........................................................................ 13
REVISION HISTORY
10/09—Rev. G to Rev. H
Deleted ADR390 ................................................................. Universal
Changes to Ordering Guide Section ............................................ 18
2/08—Rev. F to Rev. G
Changes to Ripple Rejection Ration Parameter (Table 2) ........... 3
Changes to Ripple Rejection Ration Parameter (Table 3) ........... 4
Changes to Ripple Rejection Ration Parameter (Table 4) ........... 5
Changes to Ripple Rejection Ration Parameter (Table 5) ........... 6
Changes to Figure 7 .......................................................................... 9
Changes to Outline Dimensions................................................... 19
Changes to Ordering Guide .......................................................... 19
5/05—Rev. E to Rev. F
Changes to Table 5 ............................................................................ 7
Changes to Figure 2 .......................................................................... 9
4/04—Rev. D to Rev. E
Changes to ADR390—Specifications ............................................. 3
Changes to ADR391—Specifications ............................................. 4
Changes to ADR392—Specifications ............................................. 5
Changes to ADR395—Specifications ............................................. 6
4/04—Rev. C to Rev. D
Updated Format .................................................................. Universal
Changes to Title ................................................................................ 1
Changes to Features.......................................................................... 1
Changes to Applications .................................................................. 1
Changes to General Description .................................................... 1
Changes to Table 1 ............................................................................ 1
Changes to ADR390—Specifications ............................................. 3
Changes to ADR391—Specifications ............................................. 4
Rev. H | Page 2 of 20
PCB Design
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