ADR421 Analog Devices, ADR421 Datasheet

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ADR421

Manufacturer Part Number
ADR421
Description
Manufacturer
Analog Devices
Datasheet

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FEATURES
Low noise (0.1 Hz to 10 Hz)
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
Quiescent current: 0.5 mA maximum
High output current: 10 mA
Wide temperature range: −40°C to +125°C
APPLICATIONS
Precision data acquisition systems
High resolution converters
Battery-powered instrumentation
Portable medical instruments
Industrial process control systems
Precision instruments
Optical network control circuits
ADR42x PRODUCTS
Table 1.
Model
ADR420
ADR421
ADR423
ADR425
Rev. H
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
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.
ADR420: 1.75 μV p-p
ADR421: 1.75 μV p-p
ADR423: 2.0 μV p-p
ADR425: 3.4 μV p-p
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
Output Voltage, V
2.048
2.50
3.00
5.00
OUT
(V)
Ultraprecision, Low Noise, 2.048 V/2.500 V/
mV
1, 3
1, 3
1.5, 4
2, 6
3.00 V/5.00 V XFET
Initial Accuracy
%
0.05, 0.15
0.04, 0.12
0.04, 0.13
0.04, 0.12
ADR420/ADR421/ADR423/ADR425
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
GENERAL DESCRIPTION
The ADR42x are a series of ultraprecision, second generation
eXtra implanted junction FET (XFET) voltage references
featuring low noise, high accuracy, and excellent long-term
stability in SOIC and MSOP footprints.
Patented temperature drift curvature correction technique and
XFET technology minimize nonlinearity of the voltage change
with temperature. The XFET architecture offers superior
accuracy and thermal hysteresis to the band gap references. It
also operates at lower power and lower supply headroom than
the buried Zener references.
The superb noise and the stable and accurate characteristics
of the ADR42x make them ideal for precision conversion
applications such as optical networks and medical equipment.
The ADR42x trim terminal can also be used to adjust the out-
put 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 have
8-lead SOIC or 30% smaller, 8-lead MSOP packages.
Temperature Coefficient (ppm/°C)
3, 10
3, 10
3, 10
3, 10
Figure 1. 8-Lead SOIC, 8-Lead MSOP
TP = TEST PIN (DO NOT CONNECT)
®
NIC = NO INTERNAL CONNECTION
©2001–2007 Analog Devices, Inc. All rights reserved.
PIN CONFIGURATION
GND
NIC
V
TP
IN
Voltage References
1
2
3
4
(Not to Scale)
ADR420/
ADR421/
ADR423/
ADR425
TOP VIEW
8
7
6
5
TP
NIC
V
TRIM
OUT
www.analog.com

ADR421 Summary of contents

Page 1

... 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 ADR420 ADR421: 4 ADR423 ADR425 Quiescent current: 0.5 mA maximum High output current Wide temperature range: −40°C to +125°C ...

Page 2

... TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Pin Configuration............................................................................. 1 General Description ......................................................................... 1 ADR42x Products............................................................................. 1 Revision History ............................................................................... 2 Specifications..................................................................................... 3 ADR420 Electrical Specifications............................................... 3 ADR421 Electrical Specifications............................................... 4 ADR423 Electrical Specifications............................................... 5 ADR425 Electrical Specifications............................................... 6 Absolute Maximum Ratings............................................................ 7 Thermal Resistance ...................................................................... 7 ESD Caution.................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Typical Performance Characteristics ............................................. 9 Terminology .................................................................................... 15 Theory of Operation ...

Page 3

... IN −40°C < T < +125° p-p 0 kHz ∆V 1000 hours OUT V OUT_HYS RRR kHz Rev Page ADR420/ADR421/ADR423/ADR425 Min Typ Max 2.045 2.048 2.051 2.047 2.048 2.049 −3 +3 −0.15 +0.15 −1 +1 −0.05 +0. ...

Page 4

... ADR420/ADR421/ADR423/ADR425 ADR421 ELECTRICAL SPECIFICATIONS 25°C, unless otherwise noted Table 3. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade B Grade TEMPERATURE COEFFICIENT A Grade B Grade SUPPLY VOLTAGE HEADROOM LINE REGULATION LOAD REGULATION QUIESCENT CURRENT VOLTAGE NOISE VOLTAGE NOISE DENSITY TURN-ON SETTLING TIME ...

Page 5

... IN −40°C < T < +125° p-p 0 kHz ∆V 1000 hours OUT V OUT_HYS RRR kHz Rev Page ADR420/ADR421/ADR423/ADR425 Min Typ Max 2.996 3.000 3.004 2.9985 3.000 3.0015 −4 +4 −0.13 +0.13 −1.5 +1.5 −0.04 +0. ...

Page 6

... ADR420/ADR421/ADR423/ADR425 ADR425 ELECTRICAL SPECIFICATIONS 25°C, unless otherwise noted Table 5. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade B Grade TEMPERATURE COEFFICIENT A Grade B Grade SUPPLY VOLTAGE HEADROOM LINE REGULATION LOAD REGULATION QUIESCENT CURRENT VOLTAGE NOISE VOLTAGE NOISE DENSITY TURN-ON SETTLING TIME ...

Page 7

... Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ADR420/ADR421/ADR423/ADR425 THERMAL RESISTANCE θ is specified for the worst-case conditions, that is, θ JA ...

Page 8

... GND Ground Pin = TRIM Trim Terminal. It can be used to adjust the output voltage over a ±0.5% range without affecting the temperature coefficient Output Voltage. OUT TP ADR420 ADR421/ V NIC ADR423/ ADR425 V 6 NIC 3 OUT TOP VIEW GND TRIM (Not to Scale) ...

Page 9

... Figure 3. ADR420 Typical Output Voltage vs. Temperature 2.5015 2.5013 2.5011 2.5009 2.5007 2.5005 2.5003 2.5001 2.4999 2.4997 2.4995 –40 – TEMPERATURE (°C) Figure 4. ADR421 Typical Output Voltage vs. Temperature 3.0010 3.0008 3.0006 3.0004 3.0002 3.0000 2.9998 2.9996 2.9994 2.9992 2.9990 –40 – TEMPERATURE (°C) Figure 5 ...

Page 10

... Rev Page 0mA TO 5mA 6. –40 – TEMPERATURE (°C) Figure 12. ADR421 Load Regulation vs. Temperature 0mA TO 10mA 15V –40 – TEMPERATURE (°C) Figure 13. ADR423 Load Regulation vs. Temperature ...

Page 11

... TEMPERATURE (°C) Figure 15. ADR420 Line Regulation vs. Temperature 15V –40 – TEMPERATURE (°C) Figure 16. ADR421 Line Regulation vs. Temperature 15V –40 – TEMPERATURE (°C) Figure 17. ADR423 Line Regulation vs. Temperature ...

Page 12

... DEVIATION (ppm) Figure 23. ADR421 Typical Hysteresis SAMPLE SIZE – 160 Rev Page TIME (1s/DIV) Figure 24. ADR421 Typical Noise Voltage 0 TIME (1s/DIV) Figure 25. Typical Noise Voltage kHz 1k ADR425 100 ADR420 10 10 100 1k FREQUENCY (Hz) Figure 26 ...

Page 13

... C = 0µF BYPASS LINE INTERRUPTION V IN 500mV/DIV V 500mV/DIV OUT TIME (100µs/DIV) Figure 27. ADR421 Line Transient Response 0.1µF BYPASS LINE INTERRUPTION V IN 500mV/DIV V 500mV/DIV OUT TIME (100µs/DIV) Figure 28. ADR421 Line Transient Response, C BYPASS C = 0µF 1mA LOAD ...

Page 14

... NO INPUT CAP V OUT V IN TIME (4µs/DIV) Figure 34. ADR421 Turn-On Response C = 0.1µF BYPASS R = 500Ω OUT V IN TIME (100µs/DIV) Figure 35. ADR421 Turn-On/Turn-Off Response 2V/DIV 2V/DIV –10 2V/DIV –20 –30 –40 –50 2V/DIV – ...

Page 15

... A capacitor here acts as a source of stored energy for 10 sudden increase in load current. The only parameter that degrades by adding an output capacitor is the turn-on time, which depends on the size of the selected capacitor. Rev Page ADR420/ADR421/ADR423/ADR425 ( ) = ° − ...

Page 16

... band for the ADR420, ADR421, and ADR423. Figure 24 shows the 0 noise of the ADR421, which is only 1.75 μV p-p. The noise measurement is made with a band-pass filter made of a 2-pole high-pass filter with a corner frequency at 0.1 Hz and a 2-pole V OUT low-pass filter with a corner frequency ...

Page 17

... In many current-output CMOS DAC applications where 10kΩ 10kΩ (ADR420) the output signal voltage must be of the same polarity as the 15kΩ (ADR421) reference voltage, a current-switching DAC is often recon- figured into a voltage-switching DAC with a 1.25 V reference amp, a pair of resistors, and an additional operational amplifier at the output to reinvert the signal ...

Page 18

... 2.10kΩ – × ERROR L Rev Page ADR420/ V OUT SENSE ADR421 ADR423/ R ADR425 LW V OUT A1 FORCE V OUT 6 GND OP191 Figure 44. Advantage of Kelvin Connection 1µF 0.1µF ...

Page 19

... OP2177 V– 10Ω 3R2 3R2 R2 A 1kΩ 3R2 LOAD respectively able to deliver Rev Page ADR420/ADR421/ADR423/ADR425 REF ⎛ ⎞ R2 × + ⎜ ⎟ REF ⎝ ⎠ REF ⎛ ⎞ × ⎜ ...

Page 20

... AD7701 is an example of an ADC that is well suited for the ADR42x. The ADR421 is used as the precision reference for the converter in Figure 49. The AD7701 is a 16-bit ADC with on-chip digital filtering intended for measuring wide dynamic range and low frequency signals, such as those representing chemical, physical, or biological processes. It contains a charge- balancing (Σ ...

Page 21

... Figure 51. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 5. 3.20 4.90 3.00 4.65 2. PIN 1 0.65 BSC 0.95 0.85 1.10 MAX 0.75 0.15 0.38 0.23 0.00 0.22 0.08 SEATING COPLANARITY PLANE 0.10 COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 52. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters Rev Page ADR420/ADR421/ADR423/ADR425 0.50 (0.0196) 45° 0.25 (0.0099) 1.27 (0.0500) 0.40 (0.0157) 0.80 8° 0.60 0° 0.40 ...

Page 22

... ADR420ARMZ-REEL7 2.048 3 ADR420BR 2.048 1 ADR420BR-REEL7 2.048 1 1 ADR420BRZ 2.048 1 1 ADR420BRZ-REEL7 2.048 1 ADR421AR 2.50 3 ADR421AR-REEL7 2. ADR421ARZ 2.50 3 ADR421ARZ-REEL7 1 2.50 3 ADR421ARM 2.50 3 ADR421ARM-REEL7 2. ADR421ARMZ 2. ADR421ARMZ-REEL7 2.50 3 ADR421BR 2.50 1 ADR421BR-REEL7 2. ADR421BRZ 2. ADR421BRZ-REEL7 2.50 1 ADR423AR 3.00 4 ADR423AR-REEL7 3. ADR423ARZ 3. ADR423ARZ-REEL7 3.00 4 ADR423ARM 3.00 4 ADR423ARM-REEL7 3.00 4 ADR423BR 3.00 1.5 ADR423BR-REEL7 3.00 1.5 1 ADR423ARMZ 3. ADR423ARMZ-REEL7 3 ...

Page 23

... NOTES ADR420/ADR421/ADR423/ADR425 Rev Page ...

Page 24

... ADR420/ADR421/ADR423/ADR425 NOTES ©2001–2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. C02432-0-6/07(H) Rev Page ...

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