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Ultralow Noise XFET Voltage References
with Current Sink and Source Capability
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
FEATURES
Low noise (0.1 Hz to 10.0 Hz): 3.5 μV p-p @ 2.5 V output
No external capacitor required
Low temperature coefficient
A Grade: 10 ppm/°C maximum
B Grade: 3 ppm/°C maximum
Load regulation: 15 ppm/mA
Line regulation: 20 ppm/V
Wide operating range
ADR430: 4.1 V to 18 V
ADR431: 4.5 V to 18 V
ADR433: 5.0 V to 18 V
ADR434: 6.1 V to 18 V
ADR435: 7.0 V to 18 V
ADR439: 6.5 V to 18 V
High output source and sink current: +30 mA and −20 mA
Wide temperature range: −40°C to +125°C
PIN CONFIGURATIONS
TP
1
V
IN 2
3
7
NC
TOP VIEW
6
V
OUT
NC
(Not to Scale)
5
TRIM
GND
4
04500-001
04500-041
ADR43x
8
TP
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Figure 1. 8-Lead MSOP (RM-8)
TP
1
V
IN 2
NC
TOP VIEW
NC
3
6
V
OUT
(Not to Scale)
GND
4
5
TRIM
7
ADR43x
8
TP
NOTES
1. NC = NO CONNECT
2. TP = TEST PIN (DO NOT CONNECT)
Figure 2. 8-Lead SOIC_N (R-8)
APPLICATIONS
Precision data acquisition systems
High resolution data converters
Medical instruments
Industrial process control systems
Optical control circuits
Precision instruments
GENERAL DESCRIPTION
The ADR43x series is a family of XFET® voltage references
featuring low noise, high accuracy, and low temperature drift
performance. Using Analog Devices, Inc., patented temperature
drift curvature correction and XFET (eXtra implanted junction
FET) technology, voltage change vs. temperature nonlinearity in
the ADR43x is minimized.
The XFET references operate at lower current (800 μA) and
lower supply voltage headroom (2 V) than buried Zener
references. Buried Zener references require more than 5 V
headroom for operation. The ADR43x XFET references are
the only low noise solutions for 5 V systems.
The ADR43x family has the capability to source up to 30 mA of
output current and sink up to 20 mA. It also comes with a trim
terminal to adjust the output voltage over a 0.5% range without
compromising performance.
The ADR43x is available in 8-lead MSOP and 8-lead narrow
SOIC packages. All versions are specified over the extended
industrial temperature range of −40°C to +125°C.
Rev. E
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.
Table 1. Selection Guide
Output
Voltage (V)
2.048
2.048
2.500
2.500
3.000
3.000
4.096
4.096
5.000
5.000
4.500
4.500
Temperature
Coefficient
(ppm/°C)
10
3
10
3
10
3
10
3
10
3
10
3
Model
ADR430A
ADR430B
ADR431A
ADR431B
ADR433A
ADR433B
ADR434A
ADR434B
ADR435A
ADR435B
ADR439A
ADR439B
Accuracy (mV)
±3
±1
±3
±1
±4
±1.5
±5
±1.5
±6
±2
±5.5
±2
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2003–2009 Analog Devices, Inc. All rights reserved.
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configurations ........................................................................... 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR430 Electrical Characteristics............................................. 3
ADR431 Electrical Characteristics............................................. 4
ADR433 Electrical Characteristics............................................. 5
ADR434 Electrical Characteristics............................................. 6
ADR435 Electrical Characteristics............................................. 7
ADR439 Electrical Characteristics............................................. 8
Absolute Maximum Ratings............................................................ 9
Thermal Resistance ...................................................................... 9
ESD Caution .................................................................................. 9
Typical Performance Characteristics ........................................... 10
Theory of Operation ...................................................................... 15
Basic Voltage Reference Connections ...................................... 15
Noise Performance ..................................................................... 15
High Frequency Noise ............................................................... 15
Turn-On Time ............................................................................ 16
Applications Inforamtion .............................................................. 17
Output Adjustment .................................................................... 17
Reference for Converters in Optical Network Control
Circuits......................................................................................... 17
Negative Precision Reference Without Precision Resistors .. 17
High Voltage Floating Current Source .................................... 18
Kelvin Connection ..................................................................... 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
REVISION HISTORY
1/09—Rev. D to Rev. E
Added High Frequency Noise Section and Equation 3;
Renumbered Sequentially.............................................................. 15
Inserted Figure 31, Figure 32, and Figure 33; Renumbered
Sequentially ..................................................................................... 16
Changes to the Ordering Guide.................................................... 22
12/07—Rev. C to Rev. D
Changes to Initial Accuracy and Ripple Rejection Ratio
Parameters in Table 2 through Table 7 .......................................... 3
Changes to Table 9 ............................................................................ 9
Changes to Theory of Operation Section .................................... 15
Updated Outline Dimensions ....................................................... 20
8/06—Rev. B to Rev. C
Updated Format .................................................................. Universal
Changes to Table 1 ............................................................................ 1
Changes to Table 3 ............................................................................ 4
Changes to Table 4 ............................................................................ 5
Changes to Table 7 ............................................................................ 8
Changes to Figure 26 ...................................................................... 14
Changes to Figure 31 ...................................................................... 16
Updated Outline Dimensions ....................................................... 20
Changes to Ordering Guide .......................................................... 21
9/04—Rev. A to Rev. B
Added New Grade .............................................................. Universal
Changes to Specifications .................................................................3
Replaced Figure 3, Figure 4, Figure 5........................................... 10
Updated Ordering Guide .............................................................. 21
6/04—Rev. 0 to Rev. A
Changes to Format ............................................................. Universal
Changes to the Ordering Guide ................................................... 20
12/03—Revision 0: Initial Version
Rev. E | Page 2 of 24
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
SPECIFICATIONS
ADR430 ELECTRICAL CHARACTERISTICS
V
IN
= 4.1 V to 18 V, I
L
= 0 mA, T
A
= 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
LINE REGULATION
LOAD REGULATION
QUIESCENT CURRENT
VOLTAGE NOISE
VOLTAGE NOISE DENSITY
TURN-ON SETTLING TIME
LONG-TERM STABILITY
1
OUTPUT VOLTAGE HYSTERESIS
RIPPLE REJECTION RATIO
SHORT CIRCUIT TO GND
SUPPLY VOLTAGE
OPERATING RANGE
SUPPLY VOLTAGE HEADROOM
1
Symbol
V
O
Conditions
Min
2.045
2.047
Typ
2.048
2.048
Max
2.051
2.049
±3
±0.15
±1
±0.05
Unit
V
V
mV
%
mV
%
ppm/°C
ppm/°C
ppm/V
ppm/mA
ppm/mA
μA
μV p-p
nV/√Hz
μs
ppm
ppm
dB
mA
V
V
V
OERR
TCV
O
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
V
IN
= 4.1 V to 18 V, −40°C < T
A
< +125°C
I
L
= 0 mA to 10 mA, V
IN
= 5.0 V, −40°C < T
A
< +125°C
I
L
= −10 mA to 0 mA, V
IN
= 5.0 V, −40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
0.1 Hz to 10.0 Hz
1 kHz
C
L
= 0 μF
1000 hours
f
IN
= 1 kHz
2
1
5
10
3
20
15
15
800
∆V
O
/∆V
IN
∆V
O
/∆I
L
∆V
O
/∆I
L
I
IN
e
N
p-p
e
N
t
R
∆V
O
V
O_HYS
RRR
I
SC
V
IN
V
IN
− V
O
560
3.5
60
10
40
20
–70
40
4.1
2
18
The long-term stability specification is noncumulative. The drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
Rev. E | Page 3 of 24
ADR430/ADR431/ADR433/ADR434/ADR435/ADR439
ADR431 ELECTRICAL CHARACTERISTICS
V
IN
= 4.5 V to 18 V, I
L
= 0 mA, T
A
= 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
LINE REGULATION
LOAD REGULATION
QUIESCENT CURRENT
VOLTAGE NOISE
VOLTAGE NOISE DENSITY
TURN-ON SETTLING TIME
LONG-TERM STABILITY
1
OUTPUT VOLTAGE HYSTERESIS
RIPPLE REJECTION RATIO
SHORT CIRCUIT TO GND
SUPPLY VOLTAGE
OPERATING RANGE
SUPPLY VOLTAGE HEADROOM
1
Symbol
V
O
Conditions
Min
2.497
2.499
Typ
2.500
2.500
Max
2.503
2.501
±3
±0.12
±1
±0.04
Unit
V
V
mV
%
mV
%
ppm/°C
ppm/°C
ppm/V
ppm/mA
ppm/mA
μA
μV p-p
nV/√Hz
μs
ppm
ppm
dB
mA
V
V
V
OERR
TCV
O
−40°C < T
A
< +125°C
−40°C < T
A
< +125°C
V
IN
= 4.5 V to 18 V, −40°C < T
A
< +125°C
I
L
= 0 mA to 10 mA, V
IN
= 5.0 V, −40°C < T
A
< +125°C
I
L
= −10 mA to 0 mA, V
IN
= 5.0 V, −40°C < T
A
< +125°C
No load, −40°C < T
A
< +125°C
0.1 Hz to 10.0 Hz
1 kHz
C
L
= 0 μF
1000 hours
f
IN
= 1 kHz
2
1
5
10
3
20
15
15
800
∆V
O
/∆V
IN
∆V
O
/∆I
L
∆V
O
/∆I
L
I
IN
e
N
p-p
e
N
t
R
∆V
O
V
O_HYS
RRR
I
SC
V
IN
V
IN
− V
O
580
3.5
80
10
40
20
−70
40
4.5
2
18
The long-term stability specification is noncumulative. The drift in subsequent 1000 hour periods is significantly lower than in the first 1000 hour period.
Rev. E | Page 4 of 24
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