FEATURES
TYPICAL APPLICATION CIRCUIT
Ultralow voltage noise (0.1 Hz to 10 Hz): 1.2 µV p-p
Superb temperature drift: 5 ppm/°C
Low dropout operation (supply voltage headroom): 500 mV
Supply voltage operating range: 3 V to 18 V
High output source and sink current
+10 mA and −5 mA, respectively
ENHANCED PRODUCT FEATURES
Supports defense and aerospace applications (AQEC
standard)
Military temperature range (−55°C to +125°C)
Controlled manufacturing baseline
1 assembly/test site
1 fabrication site
Product change notification
Qualification data available on request
DNC 1
VIN
2
+
10µF
0.1µF
NIC 3
GND
8
DNC
ADR441-EP
7
TOP VIEW
(Not to Scale)
NIC
6
4
5
VOUT
TRIM
0.1µF
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT CONNECTED INTERNALLY.
2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
17030-001
Enhanced Product
Ultralow Noise, LDO XFET Voltage
Reference with Current Sink and Source
ADR441-EP
Figure 1.
APPLICATIONS
Precision data acquisition systems
High resolution data converters
Battery-powered instrumentation
Precision instruments
Military communication
Unmanned systems
Avionics
GENERAL DESCRIPTION
The ADR441-EP1 is a XFET® voltage reference featuring
ultralow noise, high accuracy, and low temperature drift
performance. Using Analog Devices, Inc., temperature drift
curvature correction and extra implanted junction FET (XFET)
technology, voltage change vs. temperature nonlinearity in the
ADR441-EP is greatly minimized.
The XFET reference offers better noise performance than buried
Zener references, and the XFET reference operates off
low supply voltage headroom (500 mV). This combination of
features makes the ADR441-EP ideally suited for precision
signal conversion applications in high end data acquisition
systems, military communication, and avionics applications.
1
The ADR441-EP has the capability to source up to +10 mA of
output current and sink up to −5 mA. The device also comes
with a trim terminal to adjust the output voltage over a 0.5%
range without compromising performance.
The ADR441-EP is available in an 8-lead, narrow SOIC package.
The ADR441-EP is specified over the military temperature range
of −55°C to +125°C. Additional application and technical
information can be found in the ADR441 data sheet.
Protected by U.S. Patent Number 5,838,192.
Rev. 0
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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.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
©2018 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com
ADR441-EP
Enhanced Product
TABLE OF CONTENTS
Features .............................................................................................. 1
Absolute Maximum Ratings ............................................................4
Enhanced Product Features ............................................................ 1
Thermal Resistance .......................................................................4
Applications ....................................................................................... 1
ESD Caution...................................................................................4
Typical Application Circuit ............................................................. 1
Pin Configuration and Function Descriptions..............................5
General Description ......................................................................... 1
Typical Performance Characteristics ..............................................6
Revision History ............................................................................... 2
Outline Dimensions ..........................................................................8
Specifications..................................................................................... 3
Ordering Guide .............................................................................8
Electrical Characteristics ............................................................. 3
REVISION HISTORY
7/2018—Revision 0: Initial Version
Rev. 0 | Page 2 of 8
Enhanced Product
ADR441-EP
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
VIN = 3 V to 18 V, TA = 25°C, and input capacitance (CIN) = output capacitance (COUT) = 0.1 µF, unless otherwise noted.
Table 1.
Parameter
OUTPUT VOLTAGE
INITIAL ACCURACY
Symbol
VOUT
VOERR
Test Conditions/Comments
TEMPERATURE DRIFT
REGULATION
Line
Load
TCVOUT
−55°C < TA < +125°C
ΔVOUT/ΔVIN
ΔVOUT/ΔILOAD
−55°C < TA < +125°C
Load current (ILOAD) = 0 mA to 10 mA, VIN = 4 V,
−55°C < TA < +125°C
ILOAD = 0 mA to −5 mA, VIN = 4 V, −55°C < TA < +125°C
OUTPUT CURRENT CAPACITY
Sourcing
Sinking
QUIESCENT CURRENT
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
Headroom
1
ΔVOUT/ΔILOAD
ILOAD
IIN
eN p-p
eN
tR
∆VOUT
VOUT_HYS
RRR
ISC
Min
2.499
1
Max
2.501
±1
0.04
5
Unit
V
mV
%
ppm/°C
10
20
ppm/V
+50
+50
ppm/mA
ppm/mA
−50
−50
10
−5
3
1.2
48
10
50
70
−80
27
No load, −55°C < TA < +125°C
0.1 Hz to 10 Hz
1 kHz
1000 hours
Input frequency (fIN) = 1 kHz
VIN
VIN − VOUT
Typ
2.500
3
500
3.75
18
The long-term stability specification is noncumulative. The drift in the subsequent 1000 hour period is significantly lower than in the first 1000 hour period.
Rev. 0 | Page 3 of 8
mA
mA
mA
µV p-p
nV/√Hz
µs
ppm
ppm
dB
mA
V
mV
ADR441-EP
Enhanced Product
ABSOLUTE MAXIMUM RATINGS
TA = 25°C, unless otherwise noted.
THERMAL RESISTANCE
Table 2.
Thermal performance is directly linked to printed circuit board
(PCB) design and operating environment. Careful attention to
PCB thermal design is required.
Parameter
Supply Voltage
Output Short-Circuit Duration to GND
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature, Soldering (60 sec)
Rating
20 V
Indefinite
−65°C to +150°C
−55°C to +125°C
−65°C to +150°C
300°C
Stresses at or above those listed under Absolute Maximum
Ratings may cause permanent damage to the product. This is a
stress rating only; functional operation of the product at these
or any other conditions above those indicated in the operational
section of this specification is not implied. Operation beyond
the maximum operating conditions for extended periods may
affect product reliability.
θJA is the natural convection junction to ambient thermal
resistance measured in a one cubic foot sealed enclosure.
θJC is the junction to case thermal resistance.
Table 3. Thermal Resistance
Package Type1
R-8
1
θJA
130
θJC
43
Unit
°C/W
Thermal impedance simulated values are based on a JEDEC 2S2P thermal
test board. See JEDEC JESD-51.
ESD CAUTION
Rev. 0 | Page 4 of 8
Enhanced Product
ADR441-EP
DNC 1
VIN 2
NIC 3
GND 4
8
DNC
ADR441-EP
7
NIC
TOP VIEW
(Not to Scale)
6
VOUT
5
TRIM
NOTES
1. NIC = NOT INTERNALLY CONNECTED.
THIS PIN IS NOT CONNECTED INTERNALLY.
2. DNC = DO NOT CONNECT. DO NOT CONNECT TO THIS PIN.
17030-101
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
Figure 2. Pin Configuration
Table 4. Pin Function Descriptions
Pin No.
1, 8
2
3, 7
4
5
6
Mnemonic
DNC
VIN
NIC
GND
TRIM
VOUT
Description
Do Not Connect. Do not connect to these pins.
Input Voltage Connection.
Not Internally Connected. These pins are not connected internally.
Ground.
Output Voltage Trim.
Output Voltage.
Rev. 0 | Page 5 of 8
ADR441-EP
Enhanced Product
TYPICAL PERFORMANCE CHARACTERISTICS
VIN = 7 V, TA = 25°C, and CIN = COUT = 0.1 µF, unless otherwise noted.
2.5020
10
LINE REGULATION (ppm/V)
2.5015
OUTPUT VOLTAGE (V)
2.5010
2.5005
2.5000
2.4995
2.4990
8
6
4
2
–35
–15
5
25
45
65
TEMPERATURE (°C)
85
105
125
0
–55
–35
–15
5
25
45
65
TEMPERATURE (°C)
85
105
125
17030-010
2.4980
–55
17030-003
2.4985
Figure 6. Line Regulation vs. Temperature
Figure 3. Output Voltage vs. Temperature
40
4.0
ILOAD = 0mA TO 10mA
LOAD REGULATION (ppm/mA)
SUPPLY CURRENT (mA)
35
3.5
+125°C
3.0
+25°C
–55°C
2.5
VIN = 18V
30
25
20
VIN = 6V
15
10
4
6
8
10
12
14
INPUT VOLTAGE (V)
16
18
3.5
3.0
2.5
–15
5
25
45
65
TEMPERATURE (°C)
85
105
125
17030-007
SUPPLY CURRENT (mA)
4.0
–35
–35
–15
5
25
45
65
TEMPERATURE (°C)
85
105
125
Figure 7. Load Regulation vs. Temperature for Various Input Voltages
Figure 4. Supply Current vs. Input Voltage for Various Temperatures
2.0
–55
0
–55
17030-011
2.0
17030-006
5
Figure 5. Supply Current vs. Temperature
Rev. 0 | Page 6 of 8
Enhanced Product
ADR441-EP
0.7
0.5
MINIMUM HEADROOM (V)
0.4
0.5
+125°C
0.4
+25°C
–55°C
0.3
0.2
0.3
0.2
0.1
0
–10
–5
0
LOAD CURRENT (mA)
5
10
0
–55
–35
–15
65
5
25
45
TEMPERATURE (°C)
85
105
Figure 9. Minimum Headroom vs. Temperature
Figure 8. Supply Voltage Headroom vs. Load Current for Various
Temperatures
Rev. 0 | Page 7 of 8
125
17030-015
0.1
17030-014
SUPPLY VOLTAGE HEARDROOM (V)
NO LOAD
0.6
ADR441-EP
Enhanced Product
OUTLINE DIMENSIONS
5.00 (0.1968)
4.80 (0.1890)
1
5
6.20 (0.2441)
5.80 (0.2284)
4
1.27 (0.0500)
BSC
0.25 (0.0098)
0.10 (0.0040)
COPLANARITY
0.10
SEATING
PLANE
0.50 (0.0196)
0.25 (0.0099)
1.75 (0.0688)
1.35 (0.0532)
0.51 (0.0201)
0.31 (0.0122)
45°
8°
0°
0.25 (0.0098)
0.17 (0.0067)
1.27 (0.0500)
0.40 (0.0157)
COMPLIANT TO JEDEC STANDARDS MS-012-AA
CONTROLLING DIMENSIONS ARE IN MILLIMETERS; INCH DIMENSIONS
(IN PARENTHESES) ARE ROUNDED-OFF MILLIMETER EQUIVALENTS FOR
REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN.
012407-A
8
4.00 (0.1574)
3.80 (0.1497)
Figure 10. 8-Lead Standard Small Outline Package [SOIC_N]
Narrow Body
(R-8)
Dimensions shown in millimeters and (inches)
ORDERING GUIDE
Model 1
ADR441TRZ-EP
ADR441TRZ-EP-R7
1
Output Voltage (V)
2.500
2.500
Initial Accuracy
±mV
%
1
0.04
1
0.04
Temperature
Drift (ppm/°C)
5
5
Z = RoHS Compliant Part.
©2018 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D17030-0-7/18(0)
Rev. 0 | Page 8 of 8
Temperature Range
−55°C to +125°C
−55°C to +125°C
Package Description
8-Lead SOIC_N
8-Lead SOIC_N
Package
Option
R-8
R-8
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