ANALOG DEVICES ADR293 Service Manual

Low Noise, Micropower

www.BDTIC.com/ADI

FEATURES

6.0 V to 15 V supply range
Supply current: 15 μA maximum
Low noise: 15 μV p-p typical (0.1 Hz to 10 Hz)
High output current: 5 mA
Temperature range: −40°C to +125°C
Pin-compatible with the REF02/REF19x

APPLICATIONS

Portable instrumentation
Precision reference for 5 V systems
ADC and DAC reference
Solar-powered applications
Loop-current powered instruments

GENERAL DESCRIPTION

The ADR293 is a low noise, micropower precision voltage
reference that utilizes an XFET® (eXtra implanted junction FET)
reference circuit. The 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 long­term stability.

The ADR293 is a series voltage reference providing stable and

ccurate output voltage from a 6.0 V supply. Quiescent current

a
is only 15 μA maximum, making this device ideal for battery
powered instrumentation. Three electrical grades are available
offering initial output accuracy of ±3 mV, ±6 mV, and ±10 mV.
Temperature coefficients for the three grades are 8 ppm/°C,

5.0 V Precision Voltage Reference
ADR293

PIN CONFIGURATIONS

NC

1

ADR293

V

2

IN

TOP VIEW

NC

3

(Not to Scale)

4

GND

NC = NO CONNECT

Figure 1. 8-Lead Narrow Body SOIC (R-8)

1

NC

2

V

NC

GND

ADR293

IN

TOP VIEW

3

(Not to Scale)

4

NC = NO CONNECT

Figure 2. 8-Lead TSSOP (RU-8)

15 ppm/°C, and 25 ppm/°C maximum. Line regulation and load
regulation are typically 30 ppm/V and 30 ppm/mA, respectively,
maintaining the reference’s overall high performance.

The ADR293 is specified over the extended industrial

emperature range of –40°C to +125°C. This device is available

t
in the 8-lead SOIC and 8-lead TSSOP packages.

Table 1. ADR29x Products

Device

Output
V

oltage (V)

Initial
Accuracy (%)

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 0.06, 0.12, 0.20 8, 15, 25

NC

8

NC

7

V

6

OUT

5

NC

8

NC

7

NC

6

V

OUT

5

NC

00164-001

00164-002

Temperature
C

oefficient

(ppm/°C max)

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Anal og Devices for its use, nor for any infringements of patents or ot her
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: [phone] www.analog.com
Fax: [phone] ©2007 Analog Devices, Inc. All rights reserved.

ADR293

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TABLE OF CONTENTS

Features.............................................................................................. 1

Applications....................................................................................... 1

Pin Configurations ........................................................................... 1

General Description ......................................................................... 1

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Electrical Specificiations.............................................................. 3

Absolute Maximum Ratings............................................................ 5

Thermal Resistance ...................................................................... 5

ESD Caution.................................................................................. 5

Typical Performance Characteristics ............................................. 6

Terminology ...................................................................................... 9

Theory of Operation ...................................................................... 10

REVISION HISTORY

6/07—Rev. A to Rev. B

Updated Format..................................................................Universal

Changes to Table 1............................................................................ 1

Updated Outline Dimensions....................................................... 13

Changes to Ordering Guide.......................................................... 13

3/01—Rev. 0 to Rev. A

Device Power Dissipation Considerations.............................. 10

Basic Voltage Reference Connections ..................................... 10

Noise Performance..................................................................... 10

Turn-On Time ............................................................................ 10

Applications..................................................................................... 11

A Negative Precision Reference Without Precision

Resistors....................................................................................... 11

A Precision Current Source...................................................... 11

Kelvin Connections.................................................................... 11

Voltage Regulator for Portable Equipment............................. 12

Outline Dimensions....................................................................... 13

Ordering Guide .......................................................................... 14

Rev. B | Page 2 of 16

ADR293

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SPECIFICATIONS

ELECTRICAL SPECIFICIATIONS

VS = 6.0 V, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

OUTPUT VOLTAGE V

E Grade 4.997 5.000 5.003 V
F Grade 4.994 5.000 5.006 V
G Grade 4.990 5.000 5.010 V

INITIAL ACCURACY I

E Grade –3 +3 mV

0.06 %
F Grade –6 +6 mV

0.12 %
G Grade –10 +10 mV

0.20 %
LINE REGULATION ΔV

E, F Grades 30 100 ppm/V
G Grade 40 150 ppm/V

LOAD REGULATION ΔV

E, F Grades 30 100 ppm/mA

G Grade 40 150 ppm/mA
LONG-TERM STABILITY ΔV
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 15 μV p-p
WIDEBAND NOISE DENSITY eN at 1 kHz 640 nV/√Hz

V

= 6.0 V, TA = −25°C to +85°C, unless otherwise noted.

S

I

OUT

/ΔVIN 6.0 V to 15 V, I

OUT

/ΔI

OUT

LOAD

After 1000 hours of operation @ 125°C 50 ppm

OUT

= 0 mA

OUT

= 0 mA

OUT

= 0 mA

OUT

VS = 6.0 V, 0 mA to 5 mA

Table 3.

Parameter Symbol Conditions Min Typ Max Unit

TEMPERATURE COEFFICIENT TCV

I

OUT

OUT

= 0 mA
E Grade 3 8 ppm/°C
F Grade 5 15 ppm/°C
G Grade 10 25 ppm/°C

LINE REGULATION ΔV

/ΔVIN 6.0 V to 15 V, I

OUT

= 0 mA

OUT

E, F Grades 35 150 ppm/V
G Grade 50 200 ppm/V

LOAD REGULATION ΔV

OUT

/ΔI

VS = 6.0 V, 0 mA to 5 mA

LOAD

E, F Grades 20 150 ppm/mA
G Grade 30 200 ppm/mA

Rev. B | Page 3 of 16

ADR293

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VS = 6.0 V, TA = −40°C to +125°C, unless otherwise noted.

Table 4.

Parameter Symbol Conditions Min Typ Max Unit

TEMPERATURE COEFFICIENT TCV

E Grade 3 10 ppm/°C
F Grade 5 20 ppm/°C
G Grade 10 30 ppm/°C

LINE REGULATION ΔV

E, F Grades 40 200 ppm/V
G Grade 70 250 ppm/V

LOAD REGULATION ΔV

E, F Grades 20 200 ppm/mA
G Grade 30 300 ppm/mA

SUPPLY CURRENT IS @ 25°C 11 15 μA
15 20 μA

THERMAL HYSTERESIS V
8-lead TSSOP 157 ppm

I

OUT

/ΔVIN 6.0 V to 15 V, I

OUT

/ΔI

OUT

LOAD

8-lead SOIC_N 72 ppm

OUT-HYS

= 0 mA

OUT

= 0 mA

OUT

VS = 6.0 V, 0 mA to 5 mA

Rev. B | Page 4 of 16

ADR293

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ABSOLUTE MAXIMUM RATINGS

Table 5.

Parameter Rating

Supply Voltage 18 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +125°C
Junction Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 60 sec) 300°C

Stresses above those listed under Absolute Maximum Ratings

y cause permanent damage to the device. This is a stress

ma
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

THERMAL RESISTANCE

θJA is specified for worst-case conditions; that is, θJA is specified
for device in socket testing. In practice, θ
device soldered in circuit board.

Table 6. Thermal Resistance

Package Type θJA θ

8-Lead SOIC_N (R-8) 158 43 °C/W
8-Lead TSSOP (RU-8) 240 43 °C/W

is specified for a

JA

Unit

JC

ESD CAUTION

Rev. B | Page 5 of 16