Datasheet ADR420, ADR421, ADR423, ADR425 (Analog Devices)

Ultraprecision, Low Noise, 2.048 V/2.500 V/ 3.00 V/5.00 V XFET® Voltage References Data Sheet ADR420/ ADR421/ ADR423/ ADR425 FEATURES PIN CONFIGURATION Low noise (0.1 Hz to 10 Hz) TP 1 ADR420/ 8 TP ADR420: 1.75 μV p-p ADR421/ VIN 2 7 NIC ADR423/ ADR421: 1.75 μV p-p NIC 3 ADR425 6 VOUT ADR423: 2 .0 μV p-p TOP VIEW GND 4 (Not to Scale) 5 TRIM ADR425: 3 .4 μV p-p
1 0 0
Low temperature coefficient: 3 ppm/°C NIC = NO INTERNAL CONNECTION
2- 43
TP = TEST PIN (DO NOT CONNECT) Long-term stability: 50 ppm/1000 hours
02 Figure 1. 8-Lead SOIC, 8-Lead MSOP
Load regulation: 70 ppm/mA Line regulation: 35 ppm/V GENERAL DESCRIPTION Low hysteresis: 40 ppm typical
The ADR42x are a series of ultraprecision, second generation
Wide operating range
eXtra implanted junction FET (XFET) voltage references
ADR420: 4 V to 18 V
featuring low noise, high accuracy, and excellent long-term
ADR421: 4.5 V to 18 V
stability in SOIC and MSOP footprints.
ADR423: 5 V to 18 V
Patented temperature drift curvature correction technique and
ADR425: 7 V to 18 V
XFET technology minimize nonlinearity of the voltage change
Quiescent current: 0.5 mA maximum
with temperature. The XFET architecture offers superior
High output current: 10 mA
accuracy and thermal hysteresis to the band gap references. It
Wide temperature range: −40°C to +125°C
also operates at lower power and lower supply headroom than
APPLICATIONS
the buried Zener references.
Precision data acquisition systems
The superb noise and the stable and accurate characteristics
High resolution converters
of the ADR42x make them ideal for precision conversion
Battery-powered instrumentation
applications such as optical networks and medical equipment.
Portable medical instruments
The ADR42x trim terminal can also be used to adjust the out-
Industrial process control systems
put voltage over a ±0.5% range without compromising any
Precision instruments
other performance. The ADR42x series voltage references
Optical network control circuits
offer two electrical grades and are specified over the extended industrial temperature range of −40°C to +125°C. Devices have 8-lead SOIC or 30% smaller, 8-lead MSOP packages.
ADR42x PRODUCTS Table 1. Initial Accuracy Output Voltage, VOUT (V) Model mV % Temperature Coefficient (ppm/°C)
ADR420 2.048 1, 3 0.05, 0.15 3, 10 ADR421 2.50 1, 3 0.04, 0.12 3, 10 ADR423 3.00 1.5, 4 0.04, 0.13 3, 10 ADR425 5.00 2, 6 0.04, 0.12 3, 10
Rev. J Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2001–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications Pin Configuration General Description ADR42x Products Revision History Specifications ADR420 Electrical Specifications ADR421 Electrical Specifications ADR423 Electrical Specifications ADR425 Electrical Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configurations and Function Descriptions Typical Performance Characteristics Terminology Theory of Operation Device Power Dissipation Considerations Basic Voltage Reference Connections Noise Performance Turn-On Time Applications Output Adjustment Reference for Converters in Optical Network Control Circuits High Voltage Floating Current Source Kelvin Connections Dual-Polarity References Programmable Current Source Programmable DAC Reference Voltage Precision Voltage Reference for Data Converters Precision Boosted Output Regulator Outline Dimensions Ordering Guide