Ultralow Noise, High Accuracy
Voltage References
Data Sheet
FEATURES
Maximum temperature coefficient (TCV
OUT
):
0.8 ppm/°C (D grade 0°C to 70°C)
1 ppm/°C (C grade 0°C to 70°C)
2 ppm/°C (B grade −40°C to +125°C)
4 ppm/°C (A grade −40°C to +125°C)
Output noise (0.1 Hz to 10 Hz):
1 μV p-p at V
OUT
of 2.048 V typical
Initial output voltage error:
B, C, D grade: ±0.02% (maximum)
Input voltage range: 3 V to 15 V
Operating temperature:
A grade and B grade: −40°C to +125°C
C grade and D grade: 0°C to +70°C
Output current: +10 mA source/−10 mA sink
Low quiescent current: 950 μA (maximum)
Low dropout voltage: 300 mV at 2 mA (V
OUT
≥ 3 V)
8-lead SOIC and LCC package
AEC-Q100 qualified for automotive applications
Long-term drift: 8 ppm typical at 4500 hours
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
PIN CONFIGURATIONS
ADR4520/ADR4525/
ADR4530/ADR4533/
ADR4540/ADR4550
NIC
1
V
IN 2
NIC
3
8
7
DNC
NIC
6
V
OUT
TOP VIEW
(Not to Scale)
5
NIC
GND
4
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT CONNECTED INTERNALLY.
2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
Figure 1. 8-Lead SOIC Pin Configuration
ADR4520/ADR4525/
ADR4530/ADR4533/
ADR4540/ADR4550
DNC
8
DNC
V
IN
GND
FORCE
1
2
3
4
7
6
5
VOUT
FORCE
VOUT
SENSE
NIC
Precision data acquisition systems
High resolution data converters
High precision measurement devices
Industrial instrumentation
Medical devices
Automotive battery monitoring
Figure 2. 8-Lead LCC Pin Configuration
GENERAL DESCRIPTION
The ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/
ADR4550 devices are high precision, low power, low noise
voltage references featuring ±0.02% B, C, and D grade
maximum initial error, excellent temperature stability, and low
output noise.
This family of voltage references uses an innovative core topology
to achieve high accuracy while offering industry-leading
temperature stability and noise performance. The low, thermally
induced output voltage hysteresis and low long-term output
voltage drift of the devices also improve system accuracy over
time and temperature variations.
A maximum operating current of 950 μA and a maximum low
dropout voltage of 300 mV allow the devices to function very
well in portable equipment.
The ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/
ADR4550 series of references are each provided in an 8-lead
SOIC and are available in a wide range of output voltages, all of
which are specified over the extended industrial temperature
range of −40°C to +125°C.
Rev. D
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.
The ADR4525, ADR4540, and ADR4550 are also available in D,
which are in 8 lead LCC package, and C grade with a temperature
range of 0°C to 70°C. The ADR4525W, available in an 8-lead
SOIC package, is qualified for automotive applications.
Table 1. Selection Guide
Model
ADR4520
ADR4525
ADR4525W
ADR4530
ADR4533
ADR4540
ADR4550
Output Voltage (V)
2.048
2.5
2.5
3.0
3.3
4.096
5.0
Grade
A, B
A, B, C, D
B
A, B
A, B
A, B, C, D
A, B, C, D
Table 2. Voltage Reference Choices from Analog Devices, Inc.
V
OUT
(V)
2.048
Micropower
ADR3420
LT6656
ADR3425
LT1461
LT6656
ADR3450
LT1461
LT6656
Low Power
ADR360
LTC6652
LT6654
ADR361
LTC6652
LT6654
ADR365
LTC6652
LT6654
Ultralow Noise
ADR440
LTC6655
ADR441
LTC6655
ADR445
LTC6655
2.5
5.0
Document Feedback
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Tel: 781.329.4700 ©2012–2021 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
10203-057
APPLICATIONS
GND
SENSE
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT CONNECTED INTERNALLY.
2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
10203-001
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ...................................................................................... 1
General Description ......................................................................... 1
Pin Configurations ........................................................................... 1
Revision History ............................................................................... 2
Specifications .................................................................................... 4
ADR4520 Electrical Characteristics........................................... 4
ADR4525 Electrical Characteristics........................................... 5
ADR4530 Electrical Characteristics........................................... 6
ADR4533 Electrical Characteristics........................................... 7
ADR4540 Electrical Characteristics........................................... 8
ADR4550 Electrical Characteristics........................................... 9
Absolute Maximum Ratings ......................................................... 10
Thermal Resistance .................................................................... 10
ESD Caution................................................................................ 10
Pin Configurations and Function Descriptions ......................... 11
Typical Performance Characteristics ........................................... 12
ADR4520 ..................................................................................... 12
ADR4525 ..................................................................................... 15
Data Sheet
ADR4530 ..................................................................................... 19
ADR4533 ..................................................................................... 22
ADR4540 ..................................................................................... 25
ADR4550 ..................................................................................... 29
Terminology.................................................................................... 33
Applications Information ............................................................. 34
Basic Voltage Reference Connection ...................................... 34
Input and Output Capacitors ................................................... 34
Location of Reference in System .............................................. 34
Power Dissipation ...................................................................... 34
Sample Applications .................................................................. 34
Long-Term Drift ........................................................................ 35
Thermal Hysteresis .................................................................... 36
Humidity Sensitivity .................................................................. 37
Power Cycle Hysteresis ............................................................. 38
Outline Dimensions ....................................................................... 39
Ordering Guide .......................................................................... 39
Automotive Products ................................................................ 40
REVISION HISTORY
1/2021—Rev. C to Rev. D
Added 8-Lead LCC Package ........................................ Throughout
Changes to Features Section, General Description Section, and
Table 1 .......................................................................................................... 1
Added Figure 2; Renumbered Sequentially.......................................... 1
Changes to Table 4 ........................................................................... 5
Changes to Table 7 ........................................................................... 8
Changes to Table 8 ........................................................................... 9
Changes to Table 9 and Table 10 ................................................. 10
Added Figure 4 and Table 11; Renumbered Sequentially ........ 11
Changes to Typical Performance Characteristics Section ........ 12
Changes to Figure 110 and Figure 11 .......................................... 35
Added Figure 112 ........................................................................... 35
Changes to Figure 113 to Figure 116 ........................................... 36
Added Figure 117 ........................................................................... 36
Added Figure 118 ........................................................................... 37
Changes to Figure 120 and Figure 121 ........................................ 37
Changes to Figure 122 ................................................................... 38
Added Figure 124 ........................................................................... 38
Changes to Ordering Guide .......................................................... 38
3/2020—Rev. B to Rev. C
Added ADR4540 C Grade and ADR4550 C Grade . Throughout
Changes to Table 4 ............................................................................5
Changes to Table 7 ............................................................................8
Changes to Table 8 ............................................................................9
Deleted Figure 32, Renumbered Sequentially ............................ 18
Changes to Figure 39 ..................................................................... 19
Changes to Figure 52 ..................................................................... 22
Added Figure 69, Renumbered Sequentially .............................. 26
Changes to Figure 79 ..................................................................... 28
Added Figure 83 ............................................................................. 29
Updated Ordering Guide .............................................................. 41
12/2018—Rev. A to Rev. B
Changes to Features Section, Table 1, and Table 2 ......................1
Changes to Table 3 ............................................................................4
Changes to Table 4 ............................................................................5
Changes to Table 5 ............................................................................6
Changes to Table 6 ............................................................................7
Changes to Table 7 ............................................................................8
Changes to Table 8 ............................................................................9
Rev. D | Page 2 of 40
Data Sheet
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
Changes to Terminology Section.................................................. 30
Deleted Theory of Operation Section and Long-Term Drift
Section .............................................................................................. 31
Moved Power Dissipation Section................................................ 31
Added Long-Term Drift (LTD)Section, Figure 86, and
Figure 87 ........................................................................................... 32
Added Thermal Hysteresis Section, Figure 88, Figure 89,
Figure 90, and Figure 91 ................................................................ 33
Added Humidity Sensitivity Section, Figure 92, Figure 93, and
Figure 94 ........................................................................................... 34
Added Power Cycle Hysteresis Section and Figure 95 .............. 35
Changes to Ordering Guide .......................................................... 36
10/2017—Rev. 0 to Rev. A
Changed TP Pin to DNC Pin and NC Pin to
NIC Pin........................................................................... Throughout
Changes to Features Section, Figure 1, and General Description
Section ................................................................................................ 1
Changes to Figure 2 and Table 11 ................................................ 10
Changes to Ordering Guide .......................................................... 32
Added Automotive Products Section .......................................... 33
4/2012—Revision 0: Initial Version
Added Electrostatic Discharge (ESD) Human Body Model
(HBM) Parameter and Moisture Sensitivity Level Rating
Parameter, Table 9 ..........................................................................10
Changes to Thermal Resistance Section and Table 10 ..............10
Deleted Figure 4; Renumbered Sequentially ...............................12
Changes to Figure 15 ......................................................................14
Deleted Figure 17 ............................................................................14
Changes to Figure 16 Caption .......................................................15
Added Figure 17; Renumbered Sequentially ...............................15
Deleted Figure 19 ............................................................................15
Changes to Figure 29 ......................................................................17
Deleted Figure 32 ............................................................................17
Deleted Figure 34 ............................................................................18
Changes to Figure 43 ......................................................................20
Deleted Figure 48 ............................................................................20
Deleted Figure 50 ............................................................................21
Changes to Figure 56 ......................................................................23
Deleted Figure 63 ............................................................................23
Deleted Figure 65 ............................................................................24
Changes to Figure 69 ......................................................................26
Deleted Figure 78 ............................................................................26
Deleted Figure 80 ............................................................................27
Changes to Figure 82 ......................................................................29
Deleted Figure 93 ............................................................................29
Rev. D | Page 3 of 40
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
SPECIFICATIONS
ADR4520 ELECTRICAL CHARACTERISTICS
Unless otherwise noted, supply voltage (V
IN
) = 3 V to 15 V, I
L
= 0 mA, T
A
= 25°C.
Table 3.
Parameter
OUTPUT VOLTAGE
INITIAL OUTPUT VOLTAGE ERROR
B Grade
A Grade
SOLDER HEAT RESISTANCE SHIFT
TEMPERATURE COEFFICIENT
B Grade
A Grade
LINE REGULATION
LOAD REGULATION
ΔV
OUT
/ΔV
IN
ΔV
OUT
/ΔI
L
±0.02
TCV
OUT
See Terminology section
−40°C ≤ T
A
≤ +125°C (box method)
−40°C ≤ T
A
≤ +125°C (bowtie method)
−40°C ≤ T
A
≤ +125°C (box method)
−40°C ≤ T
A
≤ +125°C (bowtie method)
−40°C ≤ T
A
≤ +125°C
I
L
= 0 mA to +10 mA source, −40°C ≤ T
A
≤
+125°C
I
L
= 0 mA to −10 mA sink, −40°C ≤ T
A
≤ +125°C
−40°C ≤ T
A
≤ +125°C, no load
−40°C ≤ T
A
≤ +125°C, no load
−40°C ≤ T
A
≤ +125°C, I
L
= 2 mA
Input frequency (f
IN
) = 1 kHz
2
4
4
8
10
80
Symbol
V
OUT
V
OUT_ERR
Test Conditions/Comments
Min
Typ
2.048
Data Sheet
Max
Unit
V
%
μV
%
μV
%
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/V
ppm/mA
ppm/mA
μA
V
V
dB
mA
mA
μV p-p
nV/√Hz
ppm
ppm
ppm
ppm
ppm
ppm
ppm
µs
±0.02
410
±0.04
820
1
30
100
700
QUIESCENT CURRENT
DROPOUT VOLTAGE
RIPPLE REJECTION RATIO
OUTPUT CURRENT CAPACITY
Sinking
Sourcing
OUTPUT VOLTAGE NOISE
OUTPUT VOLTAGE NOISE DENSITY
OUTPUT VOLTAGE HYSTERESIS
I
Q
V
DO
RRR
I
L
120
950
1
1
90
−8
10
e
Np-p
e
N
ΔV
OUT_HYS
LONG-TERM DRIFT
ΔV
OUT_LTD
TURN-ON SETTLING TIME
LOAD CAPACITANCE
t
R
0.1 Hz to 10.0 Hz
1 kHz
T
A
= temperature cycled from
+25°C to +125°C to−40°C to +25°C (full cycle)
25°C to 125°C to 25°C (half cycle)
25°C to 70°C to 0°C to 25°C (full cycle)
25°C to 70°C to 25°C (half cycle)
T
A
= 25°C
250 hours (early life drift)
1000 hours
4500 hours
Output capacitor (C
OUT
) = 1 µF, input capacitor
(C
IN
) = 0.1 µF, load resistance (R
LOAD
) = 1 kΩ
1
1.0
35.8
−13
−97
−8
−17
19
25
51
90
100
µF
Rev. D | Page 4 of 40
Data Sheet
ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550
ADR4525 ELECTRICAL CHARACTERISTICS
Unless otherwise noted, V
IN
= 3 V to 15 V, I
L
= 0 mA, T
A
= 25°C.
Table 4.
Parameter
OUTPUT VOLTAGE
INITIAL OUTPUT VOLTAGE ERROR
B, C, D Grade
A Grade
SOLDER HEAT RESISTANCE SHIFT
A, B, C, D Grade
TEMPERATURE COEFFICIENT
D Grade
C Grade
B Grade
A Grade
LINE REGULATION
LOAD REGULATION
A, B, C Grade
D Grade
QUIESCENT CURRENT
DROPOUT VOLTAGE
RIPPLE REJECTION RATIO
OUTPUT CURRENT CAPACITY
Sinking
Sourcing
OUTPUT VOLTAGE NOISE
OUTPUT VOLTAGE NOISE
DENSITY
OUTPUT VOLTAGE HYSTERESIS
A, B, C Grade
I
Q
V
DO
RRR
I
L
ΔV
OUT
/ΔV
IN
ΔV
OUT
/ΔI
L
Symbol
V
OUT
V
OUT_ERR
Test Conditions/Comments
Min
Typ
2.500
Max
Unit
V
%
μV
%
mV
%
0.8
1.6
1
2
2
4
4
8
10
80
120
45
9
950
500
500
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/°C
ppm/V
ppm/mA
ppm/mA
ppm/mA
ppm/mA
μA
mV
mV
dB
mA
mA
μV p-p
nV/√Hz
±0.02
500
±0.04
1
±0.02
TCV
OUT
See Terminology section
0°C ≤ T
A
≤ 70°C (box method)
0°C ≤ T
A
≤ 70°C (bowtie method)
0°C ≤ T
A
≤ 70°C (box method)
0°C ≤ T
A
≤ 70°C (bowtie method)
−40°C ≤ T
A
≤ +125°C (box method)
−40°C ≤ T
A
≤ +125°C (bowtie method)
−40°C ≤ T
A
≤ +125°C (box method)
−40°C ≤ T
A
≤ +125°C (bowtie method)
−40°C ≤ T
A
≤ +125°C
I
L
= 0 mA to +10 mA source, −40°C ≤ T
A
≤ +125°C
I
L
= 0 mA to −10 mA sink, −40°C ≤ T
A
≤ +125°C
I
L
= 0 mA to +10 mA source, 0°C ≤ T
A
≤ +70°C
I
L
= 0 mA to −10 mA sink, 0°C ≤ T
A
≤ +70°C
−40°C ≤ T
A
≤ +125°C, no load
−40°C ≤ T
A
≤ +125°C, no load
−40°C ≤ T
A
≤ +125°C, I
L
= 2 mA
f
IN
= 1 kHz
1
30
60
35
4
700
90
−10
10
e
Np-p
e
N
ΔV
OUT_HYS
0.1 Hz to 10.0 Hz
1 kHz
T
A
= temperature cycled from
+25°C to +125°C to−40°C to +25°C (full cycle)
25°C to 125°C to 25°C (half cycle)
25°C to 70°C to 0°C to 25°C (full cycle)
25°C to 70°C to 25°C (half cycle)
25°C to 70°C to 0°C to 25°C (full cycle)
25°C to 70°C to 25°C (half cycle)
T
A
= 25°C
250 hours (early life drift)
1000 hours
4500 hours
250 hours (early life drift)
1000 hours
4500 hours
C
OUT
= 1 µF, C
IN
= 0.1 µF, R
LOAD
= 1 kΩ
1
Rev. D | Page 5 of 40
1.25
41.3
D Grade
LONG-TERM DRIFT
A, B, C Grade
ΔV
OUT_LTD
−13
−97
−8
−17
1
5
19
25
51
3
5
8
125
100
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
ppm
µs
µF
D Grade
TURN-ON SETTLING TIME
LOAD CAPACITANCE
t
R
FPGA/CPLD
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