IC REF PREC LONOISE 2.50V 8-SOIC

ADR421ARZ

Manufacturer Part NumberADR421ARZ
DescriptionIC REF PREC LONOISE 2.50V 8-SOIC
ManufacturerAnalog Devices Inc
SeriesXFET®
ADR421ARZ datasheet
 

Specifications of ADR421ARZ

Temperature Coefficient10ppm/°CDesign Resources40 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5380 (CN0007) 40 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5381 (CN0010) 32 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5382 (CN0011) 32 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5383 (CN0014) 8 to 16 Channels of Programmable Voltage with Excellent Temperature Drift Performance Using AD5390/1/2 (CN0029) High Precision Digital-to-Analog Conversion Using the 16-Bit AD5542/1, ADR421, and AD8628 (CN0079) 16 Channels of Programmable Output Span Using AD5360 (CN0131) Layout Considerations for an Expandable Multichannel Simultaneous Sampling Data Acquisition System Based on AD7606 (CN0148) 40 Channels of Programmable Output Span Using AD5371 (CN0149) Software Calibrated, 1 MHz to 8 GHz, 70 dB RF Power Measurement System Using AD8318 (CN0150) How to Achieve High Precision Voltage Level Setting Using AD5541A/42A (CN0169)
Reference TypeSeriesVoltage - Output2.5V
Tolerance±0.12%Voltage - Input4.5 ~ 18 V
Number Of Channels1Current - Quiescent500µA
Current - Output10mAOperating Temperature-40°C ~ 125°C
Mounting TypeSurface MountPackage / Case8-SOIC (3.9mm Width)
TopologySeriesInput Voltage4.5V To 18V
Reference Voltage2.5VReference Voltage Tolerance3mV
Voltage Reference Case StyleSOICNo. Of Pins8
Lead Free Status / RoHS StatusLead free / RoHS CompliantCurrent - Cathode-
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FEATURES
Low noise (0.1 Hz to 10 Hz)
ADR420: 1.75 μV p-p
ADR421: 1.75 μV p-p
ADR423: 2.0 μV p-p
ADR425: 3.4 μV p-p
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
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: −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.
Output Voltage, V
(V)
Model
OUT
ADR420
2.048
ADR421
2.50
ADR423
3.00
ADR425
5.00
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.
Ultraprecision, Low Noise, 2.048 V/2.500 V/
3.00 V/5.00 V XFET
ADR420/ADR421/ADR423/ADR425
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.
Initial Accuracy
mV
%
Temperature Coefficient (ppm/°C)
1, 3
0.05, 0.15
3, 10
1, 3
0.04, 0.12
3, 10
1.5, 4
0.04, 0.13
3, 10
2, 6
0.04, 0.12
3, 10
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
®
Voltage References
PIN CONFIGURATION
TP
ADR420/
TP
1
8
ADR421/
V
NIC
2
7
IN
ADR423/
ADR425
V
NIC
6
3
OUT
TOP VIEW
GND
TRIM
4
(Not to Scale)
5
NIC = NO INTERNAL CONNECTION
TP = TEST PIN (DO NOT CONNECT)
Figure 1. 8-Lead SOIC, 8-Lead MSOP
www.analog.com
©2001–2007 Analog Devices, Inc. All rights reserved.

ADR421ARZ Summary of contents

  • Page 1

    FEATURES Low noise (0 Hz) ADR420: 1.75 μV p-p ADR421: 1.75 μV p-p ADR423: 2.0 μV p-p ADR425: 3.4 μV p-p Low temperature coefficient: 3 ppm/°C Long-term stability: 50 ppm/1000 hours Load regulation: 70 ppm/mA Line regulation: ...

  • Page 2

    ADR420/ADR421/ADR423/ADR425 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............................................... ...

  • Page 3

    SPECIFICATIONS ADR420 ELECTRICAL SPECIFICATIONS 25°C, unless otherwise noted Table 2. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade B Grade TEMPERATURE COEFFICIENT A Grade B Grade ...

  • 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 ...

  • Page 5

    ADR423 ELECTRICAL SPECIFICATIONS 25°C, unless otherwise noted Table 4. Parameter OUTPUT VOLTAGE A Grade B Grade INITIAL ACCURACY A Grade B Grade TEMPERATURE COEFFICIENT A Grade B Grade SUPPLY ...

  • 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 ...

  • Page 7

    ABSOLUTE MAXIMUM RATINGS These ratings apply at 25°C, unless otherwise noted. Table 6. Parameter Supply Voltage Output Short-Circuit Duration to GND Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, 60 sec) Stresses above those listed under ...

  • Page 8

    ADR420/ADR421/ADR423/ADR425 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Table 8. Pin Function Descriptions Pin No. Mnemonic Description Test Pin. There are actual connections in TP pins, but they are reserved for factory testing purposes. Users should not connect anything ...

  • Page 9

    TYPICAL PERFORMANCE CHARACTERISTICS 2.0495 2.0493 2.0491 2.0489 2.0487 2.0485 2.0483 2.0481 2.0479 2.0477 2.0475 –40 – TEMPERATURE (°C) 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 ...

  • Page 10

    ADR420/ADR421/ADR423/ADR425 0.55 0.50 0.45 0.40 0.35 0.30 0. INPUT VOLTAGE (V) Figure 9. ADR423 Supply Current vs. Input Voltage 0.55 0.50 0.45 0.40 0.35 0.30 0. INPUT VOLTAGE (V) Figure 10. ADR425 Supply ...

  • Page 11

    V = 4.5V TO 15V –40 – TEMPERATURE (°C) Figure 15. ADR420 Line Regulation vs. Temperature 15V ...

  • Page 12

    ADR420/ADR421/ADR423/ADR425 2.5 2.0 –40°C +25°C 1.5 +125°C 1.0 0 LOAD CURRENT (mA) Figure 21. ADR423 Minimum Input/Output Voltage Differential vs. Load Current 2.5 2.0 –40°C +25°C 1.5 +125°C 1.0 0 ...

  • 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 ...

  • Page 14

    ADR420/ADR421/ADR423/ADR425 C = 0.01µ INPUT CAP V OUT V IN TIME (4µs/DIV) Figure 33. ADR421 Turn-Off Response C = 0.01µ INPUT CAP V OUT V IN TIME (4µs/DIV) Figure 34. ADR421 Turn-On Response C = 0.1µF ...

  • Page 15

    TERMINOLOGY Temperature Coefficient The change of output voltage over the operating temperature range is normalized by the output voltage at 25°C, and expressed in ppm/° − ° OUT TCV ppm / ...

  • Page 16

    ADR420/ADR421/ADR423/ADR425 THEORY OF OPERATION The ADR42x series of references uses a reference generation technique known as XFET (eXtra implanted junction FET). This technique yields a reference with low supply current, good thermal hysteresis, and exceptionally low noise. The core of ...

  • Page 17

    APPLICATIONS OUTPUT ADJUSTMENT The ADR42x trim terminal can be used to adjust the output voltage over a ±0.5% range. This feature allows the system designer to trim system errors out by setting the reference to a voltage other than the ...

  • Page 18

    ADR420/ADR421/ADR423/ADR425 HIGH VOLTAGE FLOATING CURRENT SOURCE The circuit in Figure 43 can be used to generate a floating current source with minimal self-heating. This particular configuration can operate on high supply voltages determined by the breakdown voltage of the N-channel ...

  • Page 19

    PROGRAMMABLE CURRENT SOURCE Together with a digital potentiometer and a Howland current pump, the ADR425 forms the reference source for a program- mable current as + ⎛ ⎞ ⎜ ⎟ ⎝ ⎠ × I ...

  • Page 20

    ADR420/ADR421/ADR423/ADR425 PRECISION VOLTAGE REFERENCE FOR DATA CONVERTERS The ADR42x family has a number of features that make it ideal for use with ADCs and DACs. The exceptionally low noise, tight temperature coefficient, and high accuracy characteristics make the ADR42x ideal ...

  • Page 21

    OUTLINE DIMENSIONS 0.25 (0.0098) 0.10 (0.0040) COPLANARITY 5.00 (0.1968) 4.80 (0.1890 6.20 (0.2441) 4.00 (0.1574) 1 5.80 (0.2284) 3.80 (0.1497) 4 1.27 (0.0500) BSC 1.75 (0.0688) 1.35 (0.0532) 8° 0° 0.51 (0.0201) 0.10 0.31 (0.0122) 0.25 (0.0098) SEATING ...

  • Page 22

    ... ADR420ARM-REEL7 2.048 3 1 ADR420ARMZ 2.048 3 1 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 3.00 ...

  • 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 ...