Ultraprecision Low Noise, 2.048 V/2.500 V/
®
a
3.00 V/5.00 V XFET Voltage References
ADR420/ADR421/ADR423/ADR425
FEATURES
PIN CONFIGURATION
Low Noise (0.1 Hz to 10 Hz)
ADR420: 1.75 ꢀV p-p
ADR421: 1.75 ꢀV p-p
ADR423: 2.0 ꢀV p-p
ADR425: 3.4 ꢀV p-p
Surface-Mount Packages
8-Lead SOIC
8-Lead Mini_SOIC
Low Temperature Coefficient: 3 ppm/ꢁC
Long-Term Stability: 50 ppm/1000 Hours
Load Regulation: 70 ppm/mA
Line Regulation: 35 ppm/V
Low Hysteresis: 40 ppm Typical
Wide Operating Range
1
2
3
4
8
7
6
5
TP
NIC
V
TP
ADR42x
V
IN
NIC
OUT
TOP VIEW
(Not to Scale)
TRIM
GND
NIC = NO INTERNAL CONNECTION
TP = TEST PIN (DO NOT CONNECT)
ADR420: 4 V to 18 V
ADR421: 4.5 V to 18 V
ADR423: 5 V to 18 V
ADR425: 7 V to 18 V
Quiescent Current: 0.5 mA Maximum
High Output Current: 10 mA
Wide Temperature Range: –40ꢁC to +125ꢁC
APPLICATIONS
Precision Data Acquisition Systems
High-Resolution Converters
Battery-Powered Instrumentation
Portable Medical Instruments
Industrial Process Control Systems
Precision Instruments
Optical Network Control Circuits
GENERAL DESCRIPTION
Table I. ADR42x Products
The ADR42x series are ultra-precision second-generation XFET
voltage references featuring low noise, high accuracy, and excel-
lent long-term stability in a SOIC and Mini_SOIC footprints.
Patented temperature drift curvature correction technique and XFET
(eXtra implanted junction FET) technology minimize nonlinearity
of the voltage change with temperature. The XFET architecture
offers superior accuracy and thermal hysteresis than the bandgap
references. It also operates at lower power and lower supply
headroom than the Buried Zener references.
Output
Voltage
Products VO
Initial
Accuracy
%
ADR420
Tempco
ppm/
mV
°C
ADR420
ADR421
ADR423
ADR425
2.048
1, 3
1, 3
1.5, 4
2, 6
0.05, 0.15 3, 10
0.04, 0.12 3, 10
0.04, 0.12 3, 10
0.04, 0.12 3, 10
2.50
3.00
5.00
The superb noise, stable, and accurate characteristics of ADR42x
make them ideal for precision conversion applications such as
optical network and medical equipment. The ADR42x trim
terminal can also be used to adjust the output voltage over a
0.5% range without compromising any other performance. The
ADR42x series voltage references offer two electrical grades and
are specified over the extended industrial temperature range
of –40°C to +125°C. Devices are available in 8-lead SOIC-8 or
30% smaller 8-lead Mini_SOIC-8 packages.
XFET is a registered trademark of Analog Devices, Inc.
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
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Tel: 781/329-4700
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www.analog.com
© Analog Devices, Inc., 2001