a
FEATURES
Supply Range
2.35 V to 15 V, ADR290
2.8 V to 15 V, ADR291
4.4 V to 15 V, ADR292
Supply Current 12 A Max
Low-Noise 6 V, 8 V, 12 V p-p (0.1 Hz–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
A/D and D/A Converter Reference
Solar-Powered Applications
Loop-Current-Powered Instruments
Low Noise Micropower
2.048 V, 2.5 V, and 4.096 V
Precision Voltage References
ADR290/ADR291/ADR292
PIN CONFIGURATIONS
8-Lead Narrow Body SO (SO Suffix)
NC 1
V
IN
2
8 NC
7 NC
TOP VIEW
NC 3 (Not to Scale) 6 V
OUT
5 NC
ADR29x
GND 4
NC = NO CONNECT
8-Lead TSSOP (RU Suffix)
NC 1
V
IN
2
8 NC
7 NC
TOP VIEW
NC 3 (Not to Scale) 6 V
OUT
5 NC
ADR29x
GND 4
NC = NO CONNECT
GENERAL DESCRIPTION
The ADR290, ADR291 and ADR292 are low noise, micro-
power precision voltage references that use an XFET
®
reference
circuit. The new XFET architecture offers significant perfor-
mance improvements over traditional bandgap and Buried
Zener-based references. Improvements include: one quarter the
voltage noise output of bandgap references operating at the
same current, very low and ultralinear temperature drift, low
thermal hysteresis and excellent long-term stability.
The ADR29x family are series voltage references providing stable
and accurate output voltages from supplies as low as 2.35 V for the
ADR290. Output voltage options are 2.048 V, 2.5 V, and 4.096 V
for the ADR290, 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
max for the ADR290 and ADR291, and
±
3 mV,
±
4 mV and
±
6 mV max for the ADR292. Temperature coefficients for the
three grades are 8 ppm/°C, 15 ppm/°C, and 25 ppm/°C max,
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 ADR290, 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 and 8-lead
TSSOP packages.
ADR29x Product
Part Number
ADR290
ADR291
ADR292
ADR293
Output Voltage
(V)
2.048
2.500
4.096
5.000
Initial Accuracy
(%)
Temperature Coefficient
(ppm/ C) Max
0.10, 0.15, 0.29
8, 15, 25
0.08, 0.12, 0.24
8, 15, 25
0.07, 0.10, 0.15
8, 15, 25
(See ADR293 Data Sheet)
XFET is a registered trademark of Analog Devices, Inc.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2001
ADR290/ADR291/ADR292
ABSOLUTE MAXIMUM RATINGS
Package Type
8-Lead SOIC (SO)
8-Lead TSSOP (RU)
Supply Voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Output Short-Circuit Duration to GND . . . . . . . . . . Indefinite
Storage Temperature Range
SO, RU Package . . . . . . . . . . . . . . . . . . . 65°C to 150°C
Operating Temperature Range
ADR290/ADR291/ADR292 . . . . . . . . . . . 40°C to 125°C
Junction Temperature Range
SO, RU Package . . . . . . . . . . . . . . . . . . . 65°C to 125°C
Lead Temperature (Soldering, 60 sec) . . . . . . . . . . . . . 300°C
NOTES
1. Stresses above those listed under Absolute Maximum Ratings may
cause permanent damage to the device. This is a stress rating only; functional
operation at or above this specification is not implied. Exposure to the
above maximum rating conditions for extended periods may affect device
reliability.
2. Remove power before inserting or removing units from their sockets.
JA
*
JC
Unit
°C/W
°C/W
158
240
43
43
*θ
JA
is specified for worst-case conditions, i.e.,
θ
JA
is specified for device in socket
testing. In practice,
θ
JA
is specified for a device soldered in the circuit board.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection.
Although the ADR290/ADR291/ADR292 features proprietary ESD protection circuitry, perma-
nent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore,
proper ESD precautions are recommended to avoid performance degradation or loss of functionality.
WARNING!
ESD SENSITIVE DEVICE
ORDERING GUIDE
Model
ADR290
ER, ER-REEL7, ER-REEL
FR, FR-REEL7, FR-REEL
GR, GR-REEL7, GR-REEL
GRU-REEL7, GRU-REEL
ADR291
ER, ER-REEL7, ER-REEL
FR, FR-REEL7, FR-REEL
GR, GR-REEL7, GR-REEL
GRU-REEL7, GRU-REEL
ADR292
ER, ER-REEL7, ER-REEL
FR, FR-REEL7, FR-REEL
GR, GR-REEL7, GR-REEL
GRU-REEL7, GRU-REEL
Output
Voltage
2.048
2.048
2.048
2.048
2.50
2.50
2.50
2.50
4.096
4.096
4.096
4.096
Initial
Accuracy (%)
0.10
0.15
0.29
0.29
0.08
0.12
0.24
0.24
0.07
0.10
0.15
0.15
Temperature
Coefficient
Max (ppm/ C)
8
15
25
25
8
15
25
25
8
15
25
25
Package
Description
SOIC
SOIC
SOIC
TSSOP
SOIC
SOIC
SOIC
TSSOP
SOIC
SOIC
SOIC
TSSOP
Package
Option
SO-8
SO-8
SO-8
RU-8
SO-8
SO-8
SO-8
RU-8
SO-8
SO-8
SO-8
RU-8
Number of
Parts per
Package
98, 1000, 2500
98, 1000, 2500
98, 1000, 2500
1000, 2500
98, 1000, 2500
98, 1000, 2500
98, 1000, 2500
1000, 2500
98, 1000, 2500
98, 1000, 2500
98, 1000, 2500
1000, 2500
See ADR293 data sheet for ordering guide.
OTHER XFET PRODUCTS
Part
Number
ADR420
ADR421
Nominal Output
Voltage (V)
2.048
2.50
Package
Type
8-Lead_µSOIC/SOIC
8-Lead_µSOIC/SOIC
REV. B
–5–
Embedded System
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