ADR370 Analog Devices, Inc., ADR370 Datasheet

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ADR370

Manufacturer Part Number
ADR370
Description
Precision Low Power 2.048 V Sot-23 Voltage Reference
Manufacturer
Analog Devices, Inc.
Datasheet

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FEATURES
Initial accuracy: ±4 mV maximum
Initial accuracy error: ±0.2%
Low TCVO
Load regulation: 400 μV/mA, 100 ppm/mA
Line regulation: 25 μV/V, 20 ppm/V
Wide operating range: V
Low power: 72 μA maximum
High output sink/source current: ±5 mA minimum
Wide temperature range: −40°C to +125°C
Tiny 3-lead SOT-23 package with standard pin configuration
APPLICATIONS
Battery-powered instrumentation
Portable medical instruments
Data acquisition systems
Industrial process control systems
Automotive
GENERAL DESCRIPTION
The ADR370
reference featuring high accuracy, high stability, and low power
consumption packaged in a tiny 3-lead SOT-23 package. Precise
matching and thermal tracking of on-chip components, as well
as patented temperature drift curvature correction design
techniques, have been employed to ensure that the ADR370
provides an accurate 2.048 V output.
1
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 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.
Protected by U.S. Patent No. 5,969,657; other patents pending.
±50 ppm/°C maximum from −40°C to +125°C
30 ppm/°C maximum from +25°C to +70°C
1
is a low cost, 3-terminal (series) band gap voltage
IN
= 2.3 V to 15 V
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
Table 1. ADR370 Products
Products
ADR370BRT-REEL7
ADR370ART-REEL7
This micropowered, low dropout voltage device sources or sinks
up to 5 mA of load current while providing a stable 2.048 V
output. The compact footprint, high accuracy, and operating
range of 2.3 V to 12 V make the ADR370 ideal for use in 3 V
and 5 V systems where there can be wide variations in supply
voltage and a need to minimize power dissipation.
The ADR370 is offered in A and B grades; all devices are
specified over the extended industrial range of −40°C to +125°C.
Precision Low Power 2.048 V
SOT-23 Voltage Reference
V
OUT
©2003-2007 Analog Devices, Inc. All rights reserved.
PIN CONFIGURATION
V
IN
Output
Voltage
(V
2.048
2.048
O
Figure 1. 3-Lead SOT-23
1
2
)
ADR370
Initial
Accuracy ±
(mV)
4
10
3
GND
(%)
0.2
0.5
ADR370
www.analog.com
Temperature
Coefficient
(ppm/°C)
50
100

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ADR370 Summary of contents

Page 1

... V output. The compact footprint, high accuracy, and operating range of 2 make the ADR370 ideal for use and 5 V systems where there can be wide variations in supply voltage and a need to minimize power dissipation. ...

Page 2

... Changes to Electrical Characteristics ............................................ 2 Changes to Absolute Maximum Ratings ....................................... 3 Changes to Ordering Guide ............................................................ 3 Changes to Parameter Definitions ................................................. 6 Updated Outline Dimensions ......................................................... 9 Theory of Operation .........................................................................8 Applying the ADR370...................................................................8 Applications Information .................................................................9 Low Cost Negative Reference ......................................................9 Precision Negative Reference.......................................................9 Low Cost Current Source.............................................................9 Precision Current Source with Adjustable Output ...................9 12-Bit Precision Programmable Current Source ................... 10 Precision Boosted Output Regulator ...

Page 3

... V OUT OUT ΔV /Δ ± 100 120 Hz) OUT kHz C = 0.2 μF L 1000 hours @ 25°C Rev Page ADR370 Min Typ Max Unit 2.044 2.048 2.052 V −10 +10 mV −0.5 +0.5 % − −0.2 +0.2 ...

Page 4

... ADR370 ABSOLUTE MAXIMUM RATINGS Ratings at 25°C, unless otherwise noted. Table 3. Parameter Supply Voltage Storage Temperature Range Operating Temperature Range Lead Temperature Soldering, 60 sec Infrared, 15 sec Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only ...

Page 5

... Rev Page –2 –4 –6 –8 –10 –40 45 TEMPERATURE (°C) Figure 5. Line Regulation vs. Temperature TIME (0.1s/DIV) Figure 6. Voltage Noise 0 TIME (0.1s/DIV) Figure 7. Voltage Noise 100 kHz ADR370 = 5V TO 15V 125 ...

Page 6

... ADR370 C = 0.1µ 0.22µ OUT V = 5V/DIV IN TIME (100µs/DIV) Figure 8. Turn-On Response R = 1kΩ LOAD TIME (100µs/DIV) Figure 9. Turn-Off Response = 1V/DIV V = 1V/DIV OUT V = 5V/DIV IN Rev Page 0.1µ 1V/DIV 1V/DIV OUT TIME (100µs/DIV) Figure 10 ...

Page 7

... ° − HYS ° − × ppm ° HYS 25° 25°C after temperature cycle of +25°C to −40° ADR370 (2) (3) ...

Page 8

... ADR370 THEORY OF OPERATION The ADR370 uses the band gap concept to produce a stable, low temperature coefficient voltage reference suitable for high accuracy data acquisition components and systems. This device makes use of underlying temperature characteristics of a silicon transistor’s base-emitter voltage ( the forward-biased BE operating region ...

Page 9

... APPLICATIONS INFORMATION LOW COST NEGATIVE REFERENCE A low cost negative reference can be obtained by leveraging the current sinking capability of the ADR370. By simply tying the V terminal to ground and adding a bias resistor (R OUT GND pin of the device, a negative voltage reference can be obtained as shown in Figure 14. R should be chosen such that ...

Page 10

... A precision voltage output with boosted current can be realized with the circuit shown in Figure 19. In this circuit, V maintained by the ADR370 at 2.048 V. The ADR370 sources a maximum the load current (I is more than 5 mA, and if the current is furnished by the transistor (Q1) and the input voltage supply (V ...

Page 11

... Initial Output Accuracy ± Voltage Model (V ) (mV) O ADR370ART-R2 2.048 10 ADR370ART-REEL7 2.048 10 1 ADR370ARTZ-REEL7 2.048 10 ADR370BRT-R2 2.048 4 ADR370BRT-REEL7 2.048 4 1 ADR370BRTZ-R2 2.048 4 1 ADR370BRTZ-REEL7 2.048 RoHS Compliant Part. 7” REEL 100.00 1.10 13” REEL 330.00 1.00 0.90 0.35 0.30 0.25 2.80 20.20 2.70 MIN 2.60 3.55 3.50 3.45 0.75 MIN Figure 20. SOT-23-3 Tape and Reel Outline Dimensions Dimensions shown in millimeters 3 ...

Page 12

... ADR370 NOTES ©2003-2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C03432-0-9/07(B) Rev Page ...

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