ANALOG DEVICES ADR291, ADR292 Service Manual
Low Noise Micropower 2.5 V and
V
www.BDTIC.com/ADI
4.096 V Precision Voltage References
FEATURES
Supply range
2.8 V to 15 V, ADR291
4.4 V to 15 V, ADR292
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 REF02/REF19x
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
ADR291/ADR292
CONNECTION DIAGRAMS
NC
1
ADR291/
V
2
IN
ADR292
NC
3
TOP VIEW
(Not to S cale)
4
GND
NC = NO CONNECT
Figure 1. 8-Lead SOIC (R-8)
1
NC
ADR291/
2
V
IN
ADR292
3
NC
GND
TOP VIEW
(Not to Scale)
4
NC = NO CONNECT
Figure 2. 8-Lead TSSOP (RU-8)
GND
OUT
321
ADR291
TOP VIEW
(Not to Scale)
Figure 3. 3-Lead TO-92 (T-3)
NC
8
NC
7
V
6
OUT
5
NC
00163-001
8
NC
7
NC
6
V
OUT
5
NC
00163-002
V
IN
00163-003
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
roviding stable and accurate output voltages from supplies as
p
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
b
attery-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
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
ext
ended 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
Temperature
Part No.
Output
V
oltage (V)
Initial
Accuracy (±%)
C
oefficient
(ppm/°C) Max
ADR291 2.500 0.08, 0.12, 0.24 8, 15, 25
ADR292 4.096 0.07, 0.10, 0.15 8, 15, 25
Rev. E
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: 781.329.4700 www.analog.com
Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
ADR291/ADR292
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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
Device Power Dissipation Considerations.............................. 13
Basic Voltage Reference Connections ..................................... 13
Noise Performance..................................................................... 13
Turn-On Time ............................................................................ 13
Applications Information.............................................................. 14
Negative Precision Reference Without Precision Resistors.. 14
Precision Current Source.......................................................... 14
High Voltage Floating Current Source.................................... 14
Kelvin Connections.................................................................... 15
Low Power, Low Voltage Reference for Data Converters ..... 15
Voltage Regulator for Portable Equipment............................. 15
Outline Dimensions....................................................................... 16
Ordering Guide .......................................................................... 17
REVISION HISTORY
12/07—Rev. D to Rev. E
Changes to Features.......................................................................... 1
C
hanges to Figure 34...................................................................... 14
3/06—Rev. C to Rev. D
Updated Format..................................................................Universal
hange to Table 8 ............................................................................. 6
C
Updated Outline Dimensions....................................................... 15
Changes to Ordering Guide.......................................................... 16
9/03—Rev. B to Rev. C
Deleted ADR290................................................................. Universal
C
hanges to Specifications.................................................................2
Changes to Ordering Guide.............................................................4
Updated Outline Dimensions....................................................... 13
Rev. E | Page 2 of 20
ADR291/ADR292
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SPECIFICATIONS
ADR291 ELECTRICAL SPECIFICATIONS
VS = 3.0 V to 15 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
E GRADE
Output Voltage V
Initial Accuracy V
–0.08 +0.08 %
F GRADE
Output Voltage V
Initial Accuracy V
–0.12 +0.12 %
G GRADE
Output Voltage V
Initial Accuracy V
–0.24 +0.24 %
LINE REGULATION
E/F Grades ∆V
G Grade 40 125 ppm/V
LOAD REGULATION
E/F Grades ∆V
G Grade 40 125 ppm/mA
LONG-TERM STABILITY ∆V
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 8 μV p-p
WIDEBAND NOISE DENSITY eN @ 1 kHz 480 nV/√Hz
V
= 3.0 V to 15 V, TA = −25°C to +85°C, unless otherwise noted.
S
I
OUT
–2 +2 mV
OERR
I
OUT
–3 +3 mV
OERR
I
OUT
–6 +6 mV
OERR
/∆VIN I
OUT
/∆I
OUT
LOAD
After 1000 hours of operation @ 125°C 50 ppm
OUT
= 0 mA 2.498 2.500 2.502 V
OUT
= 0 mA 2.497 2.500 2.503 V
OUT
= 0 mA 2.494 2.500 2.506 V
OUT
= 0 mA 30 100 ppm/V
OUT
VS = 5.0 V, I
= 0 mA to 5 mA 30 100 ppm/mA
OUT
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
TEMPERATURE COEFFICIENT
E Grade TCV
I
OUT
OUT
= 0 mA 3 8 ppm/°C
F Grade 5 15 ppm/°C
G Grade 10 25 ppm/°C
LINE REGULATION
E/F Grades ∆V
/∆VIN I
OUT
= 0 mA 35 125 ppm/V
OUT
G Grade 50 150 ppm/V
LOAD REGULATION
E/F Grades ∆V
OUT
/∆I
LOAD
VS = 5.0 V, I
= 0 mA to 5 mA 20 125 ppm/mA
OUT
G Grade 30 150 ppm/mA
Rev. E | Page 3 of 20
ADR291/ADR292
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VS = 3.0 V to 15 V, TA = −40°C to+125°C, unless otherwise noted.
Table 4.
Parameter Symbol Conditions Min Typ Max Unit
TEMPERATURE COEFFICIENT
E Grade TCV
F Grade 5 20 ppm/°C
G Grade 10 30 ppm/°C
LINE REGULATION
E/F Grades ∆V
G Grade 70 250 ppm/V
LOAD REGULATION
E/F Grades ∆V
G Grade 30 300 ppm/mA
SUPPLY CURRENT IS T
−40°C ≤ TA ≤ +125°C 12 15 μA
THERMAL HYSTERESIS V
ADR292 ELECTRICAL SPECIFICATIONS
VS = 5 V to 15 V, TA = 25°C, unless otherwise noted.
I
OUT
/∆VIN I
OUT
/∆I
OUT
OUT-HYS
VS = 5.0 V, I
LOAD
8-lead SOIC, 8-lead TSSOP 50 ppm
= 0 mA 3 10 ppm/°C
OUT
= 0 mA 40 200 ppm/V
OUT
= 0 mA to 5 mA 20 200 ppm/mA
OUT
= 25°C 9 12 μA
A
Table 5.
Parameter Symbol Conditions Min Typ Max Unit
E GRADE
Output Voltage V
Initial Accuracy V
I
OUT
−3 +3 mV
OERR
= 0 mA 4.093 4.096 4.099 V
OUT
−0.07 +0.07 %
F GRADE
Output Voltage V
Initial Accuracy V
I
OUT
−4 +4 mV
OERR
= 0 mA 4.092 4.096 4.1 V
OUT
−0.10 +0.10 %
G GRADE
Output Voltage V
Initial Accuracy V
I
OUT
−6 +6 mV
OERR
= 0 mA 4.090 4.096 4.102 V
OUT
−0.15 +0.15 %
LINE REGULATION
E/F Grades ∆V
/∆VIN V
OUT
= 4.5 V to 15 V, I
S
= 0 mA 30 100 ppm/V
OUT
G Grade 40 125 ppm/V
LOAD REGULATION
E/F Grades ∆V
OUT
/∆I
VS = 5.0 V, I
LOAD
= 0 mA to 5 mA 30 100 ppm/mA
OUT
G Grade 40 125 ppm/mA
LONG-TERM STABILITY ∆V
OUT
After 1000 hours of operation @
50 ppm
125°C
NOISE VOLTAGE eN 0.1 Hz to 10 Hz 12 μV p-p
WIDEBAND NOISE DENSITY eN @ 1 kHz 640 nV/√Hz
Rev. E | Page 4 of 20
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VS = 5 V to 15 V, TA = −25°C to +85°C, unless otherwise noted.
Table 6.
Parameter Symbol Conditions Min Typ Max Unit
TEMPERATURE COEFFICIENT
E Grade TCV
F Grade 5 15 ppm/°C
G Grade 10 25 ppm/°C
LINE REGULATION
E/F Grades ∆V
G Grade 50 150 ppm/V
LOAD REGULATION
E/F Grades ∆V
G Grade 30 150 ppm/mA
V
= 5 V to 15 V, TA = −40°C to +125°C, unless otherwise noted.
S
Table 7.
Parameter Symbol Conditions Min Typ Max Unit
TEMPERATURE COEFFICIENT
E Grade TCV
F Grade 5 20 ppm/°C
G Grade 10 30 ppm/°C
LINE REGULATION
E/F Grades ∆V
G Grade 70 250 ppm/V
LOAD REGULATION
E/F Grades ∆V
G Grade 30 300 ppm/mA
SUPPLY CURRENT IS T
−40°C ≤ TA ≤ +125°C 12 18 μA
THERMAL HYSTERESIS V
I
OUT
/ΔVIN V
OUT
/∆I
OUT
OUT
OUT
OUT
OUT-HYS
VS = 5.0 V, I
LOAD
I
/∆VIN V
/∆I
V
LOAD
8-lead SOIC, 8-lead TSSOP 50 ppm
= 0 mA 3 8 ppm/°C
OUT
= 4.5 V to 15 V, I
S
OUT
= 0 mA 3 10 ppm/°C
OUT
= 4.5 V to 15 V, I
S
= 5.0 V, I
S
= 25°C 10 15 μA
A
OUT
= 0 mA 35 125 ppm/V
OUT
= 0 mA to 5 mA 20 125 ppm/mA
= 0 mA 40 200 ppm/V
OUT
= 0 mA to 5 mA 20 200 ppm/mA
Rev. E | Page 5 of 20
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ABSOLUTE MAXIMUM RATINGS
Remove power before inserting or removing units from their
sockets.
Table 8.
Parameter Rating
Supply Voltage 18 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range
T, R, RU Packages −65°C to +150°C
Operating Temperature Range
ADR291/ADR292 −40°C to +125°C
Junction Temperature Range
T, R, RU Packages −65°C to +125°C
Lead Temperature (Soldering, 60 sec) 300°C
Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
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.
Table 9. Package Types
Package Type θ
8-Lead SOIC (R) 158 43 °C/W
8-Lead TSSOP (RU) 240 43 °C/W
3-Lead TO-92 (T ) 160 – °C/W
1
θJA is specified for worst-case conditions. For example, θJA is specified for a
device in socket testing. In practice, θJA is specified for a device soldered in
the circuit board.
Table 10. Other XFET Products
Nominal Output
V
Part Number
ADR420 2.048 8-Lead MSOP/SOIC
ADR421 2.50 8-Lead MSOP/SOIC
ADR423 3.0 8-Lead MSOP/SOIC
ADR425 5.0 8-Lead MSOP/SOIC
oltage (V)
1
θJC Unit
JA
Package Type
ESD CAUTION
Rev. E | Page 6 of 20
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