ANALOG DEVICES ADR380, ADR381 Service Manual
Precision Low Drift 2.048 V/2.500 V
V
FEATURES
Initial accuracy: ±5 mV/±6 mV maximum
Initial accuracy error: ±0.24%/±0.24%
Low TCV
Load regulation: 70 ppm/mA
Line regulation: 25 ppm/V
Wide operating ranges
2.4 V to 18 V for ADR380
2.8 V to 18 V for ADR381
Low power: 120 μA maximum
High output current: 5 mA
Wide temperature range: −40°C to +85°C
Tiny 3-lead SOT-23 package with standard pinout
APPLICATIONS
Battery-powered instrumentation
Portable medical instruments
Data acquisition systems
Industrial process control systems
Hard disk drives
Automotive
: 25 ppm/°C maximum
OUT
SOT-23 Voltage Reference
ADR380/ADR381
PIN CONFIGURATION
V
1
IN
ADR380/
ADR381
TOP VIEW
(Not to S cale)
2
OUT
Figure 1. 3-Lead SOT-23
(RT Suffix)
GND
3
02175-001
GENERAL DESCRIPTION
The ADR380 and ADR381 are precision 2.048 V and 2.500 V
band gap voltage references featuring high accuracy, high
stability, and low power consumption in a tiny footprint.
Patented temperature drift curvature correction techniques
minimize nonlinearity of the voltage change with temperature.
The wide operating range and low power consumption make
them ideal for 3 V to 5 V battery-powered applications.
The ADR380 and ADR381 are micropower, low dropout
voltage (LDV) devices that provide a stable output voltage from
supplies as low as 300 mV above the output voltage. They are
specified over the industrial (−40°C to +85°C) temperature
range. The ADR380/ADR381 are available in the tiny 3-lead
SOT-23 package.
Table 1. ADR38x Products
Part Number Nominal Output Voltage (V)
ADR380 2.048
ADR381 2.500
Rev. C
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ADR380/ADR381
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications ..................................................................................... 3
ADR380 Electrical Characteristics ............................................. 3
ADR381 Electrical Characteristics ............................................. 4
Absolute Maximum Ratings ............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution .................................................................................. 5
Typical Performance Characteristics ............................................. 6
Terminology .................................................................................... 10
REVISION HISTORY
10/10—Rev. B to Rev. C
Deleted Figure 32 ............................................................................ 14
Changes to Ordering Guide .......................................................... 14
1/09—Rev. A to Rev. B
Updated Format .................................................................. Universal
Changes to Table 7 ............................................................................ 5
Changes to Stacking Reference ICs for Arbitrary Outputs
Section, Figure 28, and Figure 29 ................................................. 12
Updated Outline Dimensions ....................................................... 14
Changes to Ordering Guide .......................................................... 14
Theory of Operation ...................................................................... 11
Device Power Dissipation Considerations .............................. 11
Input Capacitor ........................................................................... 11
Output Capacitor ........................................................................ 11
Applications Information .............................................................. 12
Stacking Reference ICs for Arbitrary Outputs ....................... 12
A Negative Precision Reference Without Precision Resistors
....................................................................................................... 12
Precision Current Source .......................................................... 12
Precision High Current Voltage Source .................................. 13
Outline Dimensions ....................................................................... 14
Ordering Guide .......................................................................... 14
7/04—Rev. 0 to Rev. A
Updated Format .................................................................. Universal
Changes to Ordering Guide .......................................................... 16
Updated Outline Dimensions ....................................................... 16
Rev. C | Page 2 of 16
ADR380/ADR381
SPECIFICATIONS
ADR380 ELECTRICAL CHARACTERISTICS
VIN = 5.0 V, TA = 25°C, unless otherwise noted.
Table 2.
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage V
Initial Accuracy Error V
−0.24 +0.24 %
Temperature Coefficient TCV
0°C < TA< 70°C 3 21 ppm/°C
Minimum Supply Voltage Headroom VIN – V
Line Regulation ΔV
Load Regulation ΔV
Quiescent Current IIN No load 100 120 μA
−40°C < TA < +85°C 140 μA
Voltage Noise eN 0.1 Hz to 10 Hz 5 μV p-p
Turn-On Settling Time tR 20 μs
Long-Term Stability ΔV
Output Voltage Hysteresis V
Ripple Rejection Ratio RRR fIN = 60 Hz 85 dB
Short Circuit to GND ISC 25 mA
V
= 15.0 V, TA = 25°C, unless otherwise noted.
IN
2.043 2.048 2.053 V
OUT
−5 +5 mV
OERR
−40°C < TA < +85°C 5 25 ppm/°C
OUT
I
OUT
/DVIN VIN = 2.5 V to 15 V, −40°C < TA < +85°C 10 25 ppm/V
OUT
/DI
OUT
LOAD
1000 Hrs 50 ppm
OUT
40 ppm
OUT_HYS
≤ 3 mA 300 mV
LOAD
V
−40°C < T
= 3 V, I
IN
= 0 mA to 5 mA,
LOAD
< +85°C
A
70 ppm/mA
Table 3.
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage
Initial Accuracy Error V
V
OUT
−5 +5 mV
OERR
2.043 2.048 2.053 V
−0.24 +0.24 %
Temperature Coefficient TCV
−40°C < TA < +85°C 5 25 ppm/°C
OUT
0°C < TA < 70°C 3 21 ppm/°C
Minimum Supply Voltage Headroom VIN − V
Line Regulation ΔV
Load Regulation ΔV
I
OUT
/DVIN VIN = 2.5 V to 15 V, −40°C < TA < +85°C 10 25 ppm/V
OUT
/DI
OUT
LOAD
≤ 3 mA 300 mV
LOAD
V
−40°C < T
= 3 V, I
IN
= 0 mA to 5 mA,
LOAD
< +85°C
A
70 ppm/mA
Quiescent Current IIN No load 100 120 μA
−40°C < TA < +85°C 140 μA
Voltage Noise eN 0.1 Hz to 10 Hz 5 μV p-p
Turn-On Settling Time tR 20 μs
Long-Term Stability ΔV
Output Voltage Hysteresis V
1000 Hrs 50 ppm
OUT
40 ppm
OUT_HYS
Ripple Rejection Ratio RRR fIN = 60 Hz 85 dB
Short Circuit to GND ISC 25 mA
Rev. C | Page 3 of 16
ADR380/ADR381
ADR381 ELECTRICAL CHARACTERISTICS
VIN = 5.0 V, TA = 25°C, unless otherwise noted.
Table 4.
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage
Initial Accuracy Error V
V
OUT
−6 +6 mV
OERR
−0.24 +0.24 %
Temperature Coefficient TCV
−40°C < TA < +85°C 5 25 ppm/°C
OUT
0°C < TA < 70°C 3 21 ppm/°C
Minimum Supply Voltage Headroom VIN − V
Line Regulation ΔV
Load Regulation ΔV
I
OUT
/DVIN VIN = 2.8 V to 15 V, −40°C < TA < +85°C 10 25 ppm/V
OUT
/DI
OUT
LOAD
≤ 2 mA 300 mV
LOAD
= 3.5 V, I
V
IN
−40°C < T
= 0 mA to 5 mA,
LOAD
< +85°C
A
Quiescent Current IIN No load 100 120 μA
−40°C < TA < +85°C 140 μA
Voltage Noise eN 0.1 Hz to 10 Hz 5 μV p-p
Turn-On Settling Time tR 20 μs
Long-Term Stability ΔV
Output Voltage Hysteresis V
1000 Hrs 50 ppm
OUT
75 ppm
OUT_HYS
Ripple Rejection Ratio RRR fIN = 60 Hz 85 dB
Short Circuit to GND ISC 25 mA
2.494 2.500 2.506 V
70 ppm/mA
V
= 5.0 V, TA = 25°C, unless otherwise noted.
IN
Table 5.
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage
Initial Accuracy Error V
V
OUT
−6 +6 mV
OERR
2.494 2.500 2.506 V
−0.24 +0.24 %
Temperature Coefficient TCV
−40°C < TA < +85°C 5 25 ppm/°C
OUT
0°C < TA < 70°C 3 21 ppm/°C
Minimum Supply Voltage Headroom VIN − V
Line Regulation ΔV
Load Regulation ΔV
I
OUT
/DVIN VIN = 2.8 V to 15 V, −40°C < TA < +85°C 10 25 ppm/V
OUT
/DI
OUT
LOAD
≤ 2 mA 300 mV
LOAD
V
−40°C < T
= 3.5 V, I
IN
= 0 mA to 5 mA,
LOAD
< +85°C
A
70 ppm/mA
Quiescent Current IIN No load 100 120 μA
−40°C < TA < +85°C 140 μA
Voltage Noise eN 0.1 Hz to 10 Hz 5 μV p-p
Turn-On Settling Time tR 20 μs
Long-Term Stability ΔV
Output Voltage Hysteresis V
1000 Hrs 50 ppm
OUT
75 ppm
OUT_HYS
Ripple Rejection Ratio RRR fIN = 60 Hz 85 dB
Short Circuit to GND ISC 25 mA
Rev. C | Page 4 of 16
ADR380/ADR381
ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter1 Rating
Supply Voltage 18 V
Output Short-Circuit Duration to GND
VIN > 15 V 10 sec
VIN ≤ 15 V Indefinite
Storage Temperature Range −65°C to +150°C
Operating Temperature Range −40°C to +85°C
Junction Temperature Range −65°C to +150°C
Lead Temperature (Soldering, 60 Sec) 300°C
1
Absolute maximum ratings apply at 25°C, unless otherwise noted.
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 7.
Package Type θJA Unit
3-Lead SOT-23 (RT) 333 °C/W
ESD CAUTION
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.
Rev. C | Page 5 of 16
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