High Precision Shunt Mode
Voltage References
ADR520/ADR525/ADR530/ADR540/ADR550
FEATURES
Ultracompact SC70 and SOT-23-3 packages
Temperature coefficient: 40 ppm/°C (maximum)
2× the temperature coefficient improvement over the
LM4040
Pin compatible with the LM4040/LM4050
Initial accuracy: ±0.2%
Low output voltage noise: 14 μV p-p @ 2.5 V output
No external capacitor required
Operating current range: 50 μA to 15 mA
Industrial temperature range: −40°C to +85°C
PIN CONFIGURATION
V+
1
ADR520/
ADR525/
ADR530/
ADR540/
ADR550
3
TRIM
04501-001
V–
2
Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23-3 (RT)
GENERAL DESCRIPTION
Designed for space-critical applications, the ADR520/ADR525/
ADR530/ADR540/ADR550 are high precision shunt voltage
references, housed in ultrasmall SC70 and SOT-23-3 packages.
These references feature low temperature drift of 40 ppm/°C,
an initial accuracy of better than ±0.2%, and ultralow output
noise of 14 μV p-p.
Available in output voltages of 2.048 V, 2.5 V, 3.0 V, 4.096 V,
and 5.0 V, the advanced design of the ADR520/ADR525/
ADR530/ADR540/ADR550 eliminates the need for compensa-
tion by an external capacitor, yet the references are stable with
any capacitive load. The minimum operating current increases
from a mere 50 μA to a maximum of 15 mA. This low operating
current and ease of use make these references ideally suited for
handheld, battery-powered applications.
A trim terminal is available on the ADR520/ADR525/ADR530/
ADR540/ADR550 to allow adjustment of the output voltage
over a ±0.5% range, without affecting the temperature coefficient
of the device. This feature provides users with the flexibility to
trim out any system errors.
APPLICATIONS
Portable, battery-powered equipment
Automotive
Power supplies
Data acquisition systems
Instrumentation and process control
Energy measurement
Table 1. Selection Guide
Initial
Accuracy (%)
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
Temperature
Coefficient
(ppm/°C)
70
40
70
40
70
40
70
40
70
40
Part
ADR520A
ADR520B
ADR525A
ADR525B
ADR530A
ADR530B
ADR540A
ADR540B
ADR550A
ADR550B
Voltage (V)
2.048
2.048
2.5
2.5
3.0
3.0
4.096
4.096
5.0
5.0
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.
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 ©2003–2008 Analog Devices, Inc. All rights reserved.
ADR520/ADR525/ADR530/ADR540/ADR550
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
ADR520 Electrical Characteristics............................................. 3
ADR525 Electrical Characteristics............................................. 3
ADR530 Electrical Characteristics............................................. 4
ADR540 Electrical Characteristics............................................. 4
ADR550 Electrical Characteristics............................................. 5
Absolute Maximum Ratings ............................................................6
Thermal Resistance .......................................................................6
ESD Caution...................................................................................6
Parameter Definitions .......................................................................7
Temperature Coefficient...............................................................7
Thermal Hysteresis .......................................................................7
Typical Performance Characteristics ..............................................8
Theory of Operation ...................................................................... 11
Applications ................................................................................ 11
Outline Dimensions ....................................................................... 13
Ordering Guide .......................................................................... 14
REVISION HISTORY
6/08—Rev. D to Rev. E
Changes to Table 3 ............................................................................ 3
Changes to Table 4 and Table 5 ....................................................... 4
Changes to Table 6 ............................................................................ 5
Changes to Figure 4 .......................................................................... 8
Changes to Applications Section .................................................. 11
12/07—Rev. C to Rev. D
Changes to Figure 3 and Figure 5 ................................................... 8
Changes to Figure 15, Figure 16, and Figure 17 Captions ........ 10
Changes to Figure 23 ...................................................................... 12
Updated Outline Dimensions ....................................................... 13
8/07—Rev. B to Rev. C
Changes to Figure 21 ...................................................................... 11
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 14
1/06—Rev. A to Rev. B
Updated Formatting ........................................................... Universal
Changes to Features Section ............................................................1
Changes to General Description Section .......................................1
Updated Outline Dimensions ....................................................... 13
Changes to Ordering Guide .......................................................... 14
12/03—Data Sheet Changed from Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 13
Change to Ordering Guide............................................................ 14
11/03—Revision 0: Initial Version
Rev. E | Page 2 of
16
ADR520/ADR525/ADR530/ADR540/ADR550
SPECIFICATIONS
ADR520 ELECTRICAL CHARACTERISTICS
I
IN
= 50 μA to 15 mA, T
A
= 25°C, unless otherwise noted.
Table 2.
Parameter
Output Voltage
Grade A
Grade B
Initial Accuracy
Grade A
Grade B
Temperature Coefficient
1
Grade A
Grade B
Output Voltage Change vs. I
IN
Symbol
V
OUT
Conditions
Min
2.040
2.044
V
OERR
±0.4%
±0.2%
−40°C < T
A
< +85°C
−8
−4
25
15
∆V
R
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
I
IN
= 1 mA
+8
+4
70
40
1
4
2
0.27
50
14
2
40
mV
mV
ppm/°C
ppm/°C
mV
mV
mV
Ω
μA
μV p-p
μs
ppm
Typ
2.048
2.048
Max
2.056
2.052
Unit
V
V
TCV
O
Dynamic Output Impedance
Minimum Operating Current
Voltage Noise
Turn-On Settling Time
Output Voltage Hysteresis
1
(∆V
R
/∆I
R
)
I
IN
e
N p-p
t
R
∆V
OUT_HYS
Guaranteed by design; not production tested.
ADR525 ELECTRICAL CHARACTERISTICS
I
IN
= 50 μA to 15 mA, T
A
= 25°C, unless otherwise noted.
Table 3.
Parameter
Output Voltage
Grade A
Grade B
Initial Accuracy
Grade A
Grade B
Temperature Coefficient
1
Grade A
Grade B
Output Voltage Change vs. I
IN
Symbol
V
OUT
Conditions
Min
2.490
2.495
V
OERR
±0.4%
±0.2%
−40°C < T
A
< +85°C
−10
−5
25
15
∆V
R
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
I
IN
= 1 mA
+10
+5
70
40
1
4
2
0.2
50
18
2
40
mV
mV
ppm/°C
ppm/°C
mV
mV
mV
Ω
μA
μV p-p
μs
ppm
Typ
2.500
2.500
Max
2.510
2.505
Unit
V
V
TCV
O
Dynamic Output Impedance
Minimum Operating Current
Voltage Noise
Turn-On Settling Time
Output Voltage Hysteresis
1
(∆V
R
/∆I
R
)
I
IN
e
N p-p
t
R
∆V
OUT_HYS
Guaranteed by design; not production tested.
Rev. E | Page 3 of
16
ADR520/ADR525/ADR530/ADR540/ADR550
ADR530 ELECTRICAL CHARACTERISTICS
I
IN
= 50 μA to 15 mA, T
A
= 25°C, unless otherwise noted.
Table 4.
Parameter
Output Voltage
Grade A
Grade B
Initial Accuracy
Grade A
Grade B
Temperature Coefficient
1
Grade A
Grade B
Output Voltage Change vs. I
IN
Symbol
V
OUT
Conditions
Min
2.988
2.994
V
OERR
±0.4%
±0.2%
−40°C < T
A
< +85°C
−12
−6
25
15
∆V
R
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
I
IN
= 1 mA
+12
+6
70
40
1
4
2
0.2
50
22
2
40
mV
mV
ppm/°C
ppm/°C
mV
mV
mV
Ω
μA
μV p-p
μs
ppm
Typ
3.000
3.000
Max
3.012
3.006
Unit
V
V
TCV
O
Dynamic Output Impedance
Minimum Operating Current
Voltage Noise
Turn-On Settling Time
Output Voltage Hysteresis
1
(∆V
R
/∆I
R
)
I
IN
e
N p-p
t
R
∆V
OUT_HYS
Guaranteed by design; not production tested.
ADR540 ELECTRICAL CHARACTERISTICS
I
IN
= 50 μA to 15 mA, T
A
= 25°C, unless otherwise noted.
Table 5.
Parameter
Output Voltage
Grade A
Grade B
Initial Accuracy
Grade A
Grade B
Temperature Coefficient
1
Grade A
Grade B
Output Voltage Change vs. I
IN
Symbol
V
OUT
Conditions
Min
4.080
4.088
V
OERR
±0.4%
±0.2%
−40°C < T
A
< +85°C
−16
−8
25
15
∆V
R
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
I
IN
= 1 mA
+16
+8
70
40
1
5
2
0.2
50
30
2
40
mV
mV
ppm/°C
ppm/°C
mV
mV
mV
Ω
μA
μV p-p
μs
ppm
Typ
4.096
4.096
Max
4.112
4.104
Unit
V
V
TCV
O
Dynamic Output Impedance
Minimum Operating Current
Voltage Noise
Turn-On Settling Time
Output Voltage Hysteresis
1
(∆V
R
/∆I
R
)
I
IN
e
N p-p
t
R
∆V
OUT_HYS
Guaranteed by design; not production tested.
Rev. E | Page 4 of
16
ADR520/ADR525/ADR530/ADR540/ADR550
ADR550 ELECTRICAL CHARACTERISTICS
I
IN
= 50 μA to 15 mA, T
A
= 25°C, unless otherwise noted.
Table 6.
Parameter
Output Voltage
Grade A
Grade B
Initial Accuracy
Grade A
Grade B
Temperature Coefficient
1
Grade A
Grade B
Output Voltage Change vs. I
IN
Symbol
V
OUT
Conditions
Min
4.980
4.990
V
OERR
±0.4%
±0.2%
−40°C < T
A
< +85°C
−20
−10
25
15
∆V
R
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 1 mA to 15 mA
−40°C < T
A
< +85°C
I
IN
= 0.1 mA to 15 mA
−40°C < T
A
< +85°C
0.1 Hz to 10 Hz
I
IN
= 1 mA
+20
+10
70
40
1
5
2
0.2
50
38
2
40
mV
mV
ppm/°C
ppm/°C
mV
mV
mV
Ω
μA
μV p-p
μs
ppm
Typ
5.000
5.000
Max
5.020
5.010
Unit
V
V
TCV
O
Dynamic Output Impedance
Minimum Operating Current
Voltage Noise
Turn-On Settling Time
Output Voltage Hysteresis
1
(∆V
R
/∆I
R
)
I
IN
e
N p-p
t
R
∆V
OUT_HYS
Guaranteed by design; not production tested.
Rev. E | Page 5 of
16
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