Analog Devices ADR420 1 3 5 f Datasheet

Ultraprecision, Low Noise, 2.048 V/2.500 V/

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/1,000 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

3.00 V/5.00 V XFET

ADR420/ADR421/ADR423/ADR425

PIN CONFIGURATION

NIC 3

GND

NIC = NO INTERNAL CONNECTION

TP = TEST PIN (DO NOT CONNECT)

Figure 1. 8-Lead SOIC, 8-Lead MSOP

GENERAL DESCRIPTION

The ADR42x are a series of ultraprecision, second-generation
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 (eXtra implanted junction FET) 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, as well as 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 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 have
8-lead SOIC or 30% smaller, 8-lead MSOP packages.

®

Voltage References

TP

V

IN

1

ADR420/
ADR421/

2

ADR423/

ADR425

TOP VIEW

4

(Not to Scale)

TP8
NIC7
V

6

OUT

5

TRIM

02432-001

ADR42x PRODUCTS

Table 1.

Model

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, 0.12 3, 10
ADR425 5.00 2, 6 0.04, 0.12 3, 10

Rev. F

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.

Output Voltage (V

Initial Accuracy

O)

mV % Temperature Coefficient (ppm/°C)

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: [phone]
Fax: [phone] © 2005 Analog Devices, Inc. All rights reserved.

www.analog.com

ADR420/ADR421/ADR423/ADR425

TABLE OF CONTENTS

ADR420 Electrical Specifications................................................... 3

ADR421 Electrical Specifications................................................... 4

ADR423 Electrical Specifications................................................... 5

ADR425 Electrical Specifications................................................... 6

Absolute Maximum Ratings............................................................ 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ............................................. 9

Parameter Definitions.................................................................... 15

Theory of Operation ...................................................................... 16

Device Power Dissipation Considerations.............................. 16

Basic Voltage Reference Connections...................................... 16

Noise Performance .....................................................................16

Tur n -O n Ti m e ............................................................................ 16

Applications..................................................................................... 17

Output Adjustment .................................................................... 17

Reference for Converters in Optical
Network Control Circuits

A Negative Precision Reference
Without Precision Resistors

High Voltage Floating Current Source .................................... 18

Kelvin Connections.................................................................... 18

Dual-Polarity References........................................................... 18

Programmable Current Source ................................................ 19

Programmable DAC Reference Voltage.................................. 19

Precision Voltage Reference for Data Converters.................. 20

Precision Boosted Output Regulator....................................... 20

Outline Dimensions ....................................................................... 21

Ordering Guide .......................................................................... 22

......................................................... 17

...................................................... 17

REVISION HISTORY

2/05—Rev. E to Rev. F

Updated Format..................................................................Universal

Updated Outline Dimensions....................................................... 21

Changes to Ordering Guide.......................................................... 22

7/04—Rev. D to Rev. E.

Changes to ORDERING GUIDE ................................................... 5

3/04—Rev. C to Rev. D.

Changes to Table I ............................................................................ 1

Changes to ORDERING GUIDE ................................................... 4

Updated OUTLINE DIMENSIONS ............................................ 16

1/03—Rev. B to Rev. C.

Changed Mini_SOIC to MSOP .................................UNIVERSAL

Changes to ORDERING GUIDE ................................................... 4

Corrections to Y-axis labels in TPCs 21 and 24 ........................... 9

Enhancement to Figure 13 ............................................................ 15

Updated OUTLINE DIMENSIONS ............................................ 16

3/02—Rev. A to Rev. B.

Edits to ORDERING GUIDE ..........................................................4

Deletion of Precision Voltage Regulator section........................ 15

Addition of Precision Boosted Output Regulator section ....... 15

Addition of Figure 13..................................................................... 15

Rev. 0 to Rev. A.

Addition of ADR423 and ADR425 to

ADR420/ADR421........................................................UNIVERSAL

Rev. F | Page 2 of 24

ADR420/ADR421/ADR423/ADR425

ADR420 ELECTRICAL SPECIFICATIONS

@ VIN = 5.0 V to 15.0 V, TA = 25°C, unless otherwise noted.

Table 2.

Parameter Symbol Conditions Min Typ Max Unit

Output Voltage, A Grade VO 2.045 2.048 2.051 V
Initial Accuracy V

Output Voltage, B Grade VO 2.047 2.048 2.049 V
Initial Accuracy V

Temperature Coefficient A Grade, TCVO
Temperature Coefficient, B Grade 1 3 ppm/°C

Supply Voltage Headroom VIN – VO 2 V
Line Regulation

Load Regulation

Quiescent Current IIN No load 390 500 µA

Voltage Noise eN p-p 0.1 Hz to 10 Hz 1.75 µV p-p
Voltage Noise Density eN 1 kHz 60 nV/√Hz
Turn-On Settling Time tR 10 µs
Long-Term Stability

Output Voltage Hysteresis V
Ripple Rejection Ratio RRR fIN = 10 kHz 75 dB
Short Circuit to GND ISC 27 mA

OERR

−3

−0.15

OERR

−1

−0.05

−40°C < TA < +125°C

∆V

/∆VIN

O

∆V

/∆I

O

∆V

O

40 ppm

O_HYS

VIN = 5 V to 18 V 10 35 ppm/V

−40°C < TA < +125°C
I

= 0 mA to 10 mA 70 ppm/mA

LOAD

LOAD

−40°C < TA < +125°C

−40°C < TA < +125°C

1,000 hours 50 ppm

2 10 ppm°C

600 µA

+3 mV
+0.15 %

+1 mV
+0.05 %

Rev. F | Page 3 of 24

ADR420/ADR421/ADR423/ADR425

ADR421 ELECTRICAL SPECIFICATIONS

@ VIN = 5.0 V to 15.0 V, TA = 25°C, unless otherwise noted.

Table 3.

Parameter Symbol Conditions Min Typ Max Unit

Output Voltage, A Grade VO 2.497 2.500 2.503 V
Initial Accuracy V

Output Voltage, B Grade VO 2.499 2.500 2.501 V
Initial Accuracy V

Temperature Coefficient, A Grade TCVO
Temperature Coefficient, B Grade 1 3 ppm/°C

Supply Voltage Headroom
Line Regulation

Load Regulation

Quiescent Current IIN No load 390 500 µA

Voltage Noise eN p-p 0.1 Hz to 10 Hz 1.75 µV p-p
Voltage Noise Density eN 1 kHz 80 nV/√Hz
Turn-On Settling Time tR 10 µs
Long-Term Stability

Output Voltage Hysteresis V
Ripple Rejection Ratio RRR fIN = 10 kHz 75 dB
Short Circuit to GND ISC 27 mA

OERR

OERR

V

− VO

IN

∆V

/∆VIN

O

∆V

/∆I

O

∆V

O

O_HYS

LOAD

+3 mV
+0.12 %

+1 mV
+0.04 %

−40°C < TA < +125°C

−3

−0.12

−1

−0.04

2 10 ppm/°C

2 V
VIN = 5 V to 18 V 10 35 ppm/V

−40°C < TA < +125°C
I

= 0 mA to 10 mA 70 ppm/mA

LOAD

−40°C < TA < +125°C

−40°C < TA < +125°C

600 µA

1,000 hours 50 ppm
40 ppm

Rev. F | Page 4 of 24

ADR420/ADR421/ADR423/ADR425

ADR423 ELECTRICAL SPECIFICATIONS

@ VIN = 5.0 V to 15.0 V, TA = 25°C, unless otherwise noted.

Table 4.

Parameter Symbol Conditions Min Typ Max Unit

Output Voltage, A Grade VO 2.996 3.000 3.004 V
Initial Accuracy V

Output Voltage, B Grade VO 2.9985 3.000 3.0015 V
Initial Accuracy V

Temperature Coefficient, A Grade TCVO
Temperature Coefficient, B Grade 1 3 ppm/°C

Supply Voltage Headroom
Line Regulation

Load Regulation

Quiescent Current I

Voltage Noise eN p-p 0.1 Hz to 10 Hz 2 µV p-p
Voltage Noise Density e
Turn-On Settling Time tR 10 µs
Long-Term Stability

Output Voltage Hysteresis V
Ripple Rejection Ratio RRR fIN = 10 kHz 75 dB
Short Circuit to GND ISC 27 mA

OERR

−4

−0.13

OERR

−1.5

−0.04

−40°C < TA < +125°C

V
∆V

− VO

IN

O

/∆VIN

2 V
VIN = 5 V to 18 V 10 35 ppm/V

−40°C < TA < +125°C
I

∆V

/∆I

O

LOAD

= 0 mA to 10 mA 70 ppm/mA

LOAD

−40°C < TA < +125°C

IN

No load 390 500 µA

−40°C < TA < +125°C

1 kHz 90 nV/√Hz

N

∆V

O

40 ppm

O_HYS

1,000 hours 50 ppm

2 10 ppm/°C

600 µA

+4 mV
+0.13 %

+1.5 mV
+0.04 %

Rev. F | Page 5 of 24

ADR420/ADR421/ADR423/ADR425

ADR425 ELECTRICAL SPECIFICATIONS

@ VIN = 7.0 V to 15.0 V, TA = 25°C, unless otherwise noted.

Table 5.

Parameter Symbol Conditions Min Typ Max Unit

Output Voltage, A Grade VO 4.994 5.000 5.006 V
Initial Accuracy V

Output Voltage, B Grade VO 4.998 5.000 5.002 V
Initial Accuracy V

Temperature Coefficient, A Grade TCVO
Temperature Coefficient, B Grade 1 3 ppm/°C

Supply Voltage Headroom
Line Regulation

Load Regulation

Quiescent Current IIN No load 390 500 µA

Voltage Noise eN p-p 0.1 Hz to 10 Hz 3.4 µV p-p
Voltage Noise Density e
Turn-On Settling Time tR 10 µs
Long-Term Stability ∆VO 1,000 hours 50 ppm
Output Voltage Hysteresis V
Ripple Rejection Ratio RRR fIN = 10 kHz 75 dB
Short Circuit to GND ISC 27 mA

OERR

−6

−0.12

OERR

−2

−0.04

−40°C < TA < +125°C

V

− VO

IN

∆V

/∆VIN

O

∆V

/∆I

O

LOAD

1 kHz 110 nV/√Hz

N

40 ppm

O_HYS

2 V
VIN = 7 V to 18 V 10 35 ppm/V

−40°C < TA < +125°C
I

= 0 mA to 10 mA 70 ppm/mA

LOAD

−40°C < TA < +125°C

−40°C < TA < +125°C

2 10 ppm/°C

600 µA

+6 mV
+0.12 %

+2 mV
+0.04 %

Rev. F | Page 6 of 24

ADR420/ADR421/ADR423/ADR425

ABSOLUTE MAXIMUM RATINGS

These ratings apply at 25°C, unless otherwise noted.

Table 6.

Parameter Rating

Supply Voltage 18 V
Output Short-Circuit Duration to GND Indefinite
Storage Temperature Range R, RM Packages

Operating Temperature Range ADR42x
Junction Temperature Range R, RM Packages
Lead Temperature Range (Soldering, 60 sec) 300°C

−65°C to +150°C

−40°C to +125°C

−65°C to +150°C

Table 7.

Package Type

8-Lead MSOP (RM) 190 °C/W
8-Lead SOIC (R) 130 °C/W

1

θ

JA

Unit

1

θJA is specified for the worst-case conditions, that is, θJA is specified for

devices soldered in the circuit board for surface-mount packages.

Stresses above those listed under Absolute Maximum Ratings
may cause permanent damage to the device. This is a stress
rating only; functional operation of the device at these or any
other conditions above those indicated in the operational
section of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect
device reliability.

ESD 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 this product features
proprietary ESD protection circuitry, permanent 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.

Rev. F | Page 7 of 24

ADR420/ADR421/ADR423/ADR425

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

TP

1

ADR420/
ADR421/

2

V

IN

ADR423/

ADR425

NIC

3

TOP VIEW

4

GND

(Not to Scale)

NIC = NO INTERNAL CONNECTION

TP = TEST PIN (DO NOT CONNECT)

TP

8

NIC

7

V

6

OUT

5

TRIM

02432-002

Figure 2. Pin Configuration for 8-Lead SOIC

Table 8. Pin Function Descriptions

Pin No. Mnemonic Description

1, 8 TP

Test Pin. There are actual connections in TP pins but they are reserved for factory testing purposes. Users should not
connect anything to TP pins; otherwise, the device may not function properly.

2 V

IN

Input Voltage.
3, 7 NIC No Internal Connect. NICs have no internal connections.
4 GND Ground Pin = 0 V.
5 TRIM

Trim Terminal. It can be used to adjust the output voltage over a ±0.5% range without affecting the temperature

coefficient.
6 V

OUT

Output Voltage.

TP

1

ADR420/
ADR421/

2

V

IN

ADR423/

ADR425

NIC

3

TOP VIEW

4

GND

(Not to Scale)

NIC = NO INTERNAL CONNECTION

TP = TEST PIN (DO NOT CONNECT)

TP

8

NIC

7

V

6

OUT

5

TRIM

02432-003

Figure 3. Pin Configuration for 8-Lead MSOP

Rev. F | Page 8 of 24