Initial accuracy: mV/±6 maximum Initial accuracy error: ±0.24%/±0.24%
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Precision Drift 2.048 V/2.500 SOT-23 Voltage Reference ADR380/ADR381
Initial accuracy: mV/±6 maximum Initial accuracy error: ±0.24%/±0.24% TCVOUT: ppm/°C maximum Load regulation: ppm/mA Line regulation: ppm/V Wide operating ranges ADR380 ADR381 power: maximum High output current: Wide temperature range: -40°C +85°C Tiny 3-lead SOT-23 package with standard pinout
CONFIGURATION
ADR380/ ADR381
02175-001
VIEW VOUT (Not Scale)
Figure 3-Lead SOT-23 Suffix)
APPLICATIONS
Battery-powered instrumentation Portable medical instruments Data acquisition systems Industrial process control systems Hard disk drives Automotive
GENERAL DESCRIPTION
ADR380 ADR381 precision 2.048 2.500 band voltage references featuring high accuracy, high stability, power consumption tiny footprint. Patented temperature drift curvature correction techniques minimize nonlinearity voltage change with temperature. wide operating range power consumption make them ideal battery-powered applications. ADR380 ADR381 micropower, dropout voltage (LDV) devices that provide stable output voltage from supplies above output voltage. They specified over industrial (-40°C +85°C) temperature range. ADR380/ADR381 available tiny 3-lead SOT-23 package. Table ADR38x Products
Part Number ADR380 ADR381 Nominal Output Voltage 2.048 2.500
Rev.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. Specifications subject change without notice. license granted implication otherwise under patent patent rights Analog Devices. Trademarks registered trademarks property their respective owners.
Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 ©2001-2009 Analog Devices, Inc. rights reserved.
ADR380/ADR381 TABLE CONTENTS
Features Applications Configuration General Description Revision History Specifications. ADR380 Electrical Characteristics. ADR381 Electrical Characteristics. Absolute Maximum Ratings. Thermal Resistance Caution Typical Performance Characteristics Terminology Theory Operation Device Power Dissipation Considerations Input Capacitor Output Capacitor. Applications Information Stacking Reference Arbitrary Outputs Negative Precision Reference Without Precision Resistors Precision Current Source Precision High Current Voltage Source Outline Dimensions Ordering Guide
REVISION HISTORY
1/09-Rev. Rev. Updated Format Universal Changes Table Changes Stacking Reference Arbitrary Outputs Section, Figure Figure Updated Outline Dimensions Changes Ordering Guide 7/04-Rev. Rev. Updated Format Universal Changes Ordering Guide Updated Outline Dimensions
Rev. Page
ADR380/ADR381 SPECIFICATIONS
ADR380 ELECTRICAL CHARACTERISTICS
25°C, unless otherwise noted. Table
Parameter Output Voltage Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit Symbol VOUT VOERR TCVOUT VOUT VOUT/DVIN VOUT/DILOAD VOUT VOUT_HYS Conditions 2.043 -0.24 2.048 2.053 +0.24 Unit ppm/°C ppm/°C ppm/V ppm/mA
-40°C +85°C 70°C ILOAD -40°C +85°C ILOAD -40°C +85°C load -40°C +85°C 1000
15.0 25°C, unless otherwise noted. Table
Parameter Output Voltage Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit Symbol VOUT VOERR TCVOUT VOUT VOUT/DVIN VOUT/DILOAD VOUT VOUT_HYS -40°C +85°C 70°C ILOAD -40°C +85°C ILOAD -40°C +85°C load -40°C +85°C 1000 Conditions 2.043 -0.24 2.048 2.053 +0.24 Unit ppm/°C ppm/°C ppm/V ppm/mA
Rev. Page
ADR380/ADR381
ADR381 ELECTRICAL CHARACTERISTICS
25°C, unless otherwise noted. Table
Parameter Output Voltage Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit Symbol VOUT VOERR TCVOUT VOUT VOUT/DVIN VOUT/DILOAD VOUT VOUT_HYS -40°C +85°C 70°C ILOAD -40°C +85°C ILOAD -40°C +85°C load -40°C +85°C 1000 Conditions 2.494 -0.24 2.500 2.506 +0.24 Unit ppm/°C ppm/°C ppm/V ppm/mA
25°C, unless otherwise noted. Table
Parameter Output Voltage Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit Symbol VOUT VOERR TCVOUT VOUT VOUT/DVIN VOUT/DILOAD VOUT VOUT_HYS -40°C +85°C 70°C ILOAD -40°C +85°C ILOAD -40°C +85°C load -40°C +85°C 1000 Conditions 2.494 -0.24 2.500 2.506 +0.24 Unit ppm/°C ppm/°C ppm/V ppm/mA
Rev. Page
ADR380/ADR381 ABSOLUTE MAXIMUM RATINGS
Table
Parameter Supply Voltage Output Short-Circuit Duration Storage Temperature Range Operating Temperature Range Junction Temperature Range Lead Temperature (Soldering, Sec)
Rating Indefinite -65°C +150°C -40°C +85°C -65°C +150°C 300°C
Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those indicated operational section this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
THERMAL RESISTANCE
specified worst-case conditions, that device soldered circuit board surface-mount packages. Table
Package Type 3-Lead SOT-23 (RT) Unit °C/W
Absolute maximum ratings apply 25°C, unless otherwise noted.
CAUTION
Rev. Page
ADR380/ADR381 TYPICAL PERFORMANCE CHARACTERISTICS
2.054 TEMPERATURE +25°C -40°C +85°C +25°C 2.052
2.050
VOUT
SAMPLE
FREQUENCY
SAMPLE
TOTAL NUMBER DEVICES SAMPLE
2.048 SAMPLE
2.046
2.044
02175-002
TEMPERATURE (°C)
Figure ADR380 Output Voltage Temperature
Figure ADR381 Output Voltage Temperature Coefficient
2.506
SUPPLY CURRENT (µA)
2.504
+85°C
+25°C
2.502
VOUT
-40°C
SAMPLE
2.500 SAMPLE
2.498
SAMPLE
2.496
02175-003
TEMPERATURE (°C)
10.0 INPUT VOLTAGE
12.5
15.0
Figure ADR381 Output Voltage Temperature
Figure ADR380 Supply Current Input Voltage
TEMPERATURE +25°C -40°C +85°C +25°C
SUPPLY CURRENT (µA)
+85°C
+25°C
-40°C
FREQUENCY
TOTAL NUMBER DEVICES
02175-004
(°C)
10.0 INPUT VOLTAGE
12.5
15.0
Figure ADR380 Output Voltage Temperature Coefficient
Figure ADR381 Supply Current Input Voltage
Rev. Page
02175-007
02175-006
2.494
02175-005
2.042
(°C)
ADR380/ADR381
ILOAD
LOAD REGULATION (ppm/mA)
2.8V
LINE REGULATION (ppm/V)
02175-008
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure ADR380 Load Regulation Temperature
Figure ADR381 Line Regulation Temperature
ILOAD
LOAD REGULATION (ppm/mA) DIFFERENTIAL VOLTAGE
3.5V
+85°C -40°C
+25°C
02175-009
TEMPERATURE (°C)
LOAD CURRENT (mA)
Figure ADR381 Load Regulation Temperature
2.5V
Figure ADR380 Minimum Input/Output Differential Voltage Load Current
DIFFERENTIAL VOLTAGE
LINE REGULATION (ppm/V)
+85°C
+25°C -40°C
02175-010
TEMPERATURE (°C)
LOAD CURRENT (mA)
Figure ADR380 Line Regulation Temperature
Figure ADR381 Minimum Input/Output Differential Voltage Load Current
Rev. Page
02175-013
02175-012
02175-011
ADR380/ADR381
TEMPERATURE +25°C -40°C +85°C +25°C
CBYPASS
FREQUENCY
VOUT
1V/DIV
LINE INTERRUPTION
0.5V/DIV
0.5V/DIV
02175-014
-260 -200 -140 HYSTERESIS (ppm)
TIME (10µs/DIV)
Figure ADR381 VOUT Hysteresis
Figure ADR381 Line Transient Response
CBYPASS 0.1µF
2µV/DIV
VOUT
1V/DIV
LINE INTERRUPTION 0.5V/DIV
0.5V/DIV
02175-015
TIME (1s/DIV)
TIME (10µs/DIV)
Figure ADR381 Typical Noise Voltage,
Figure ADR381 Line Transient Response
100µV/DIV
VOUT
1V/DIV
LOAD VLOAD
2V/DIV
ILOAD
02175-016
TIME (10ms/DIV)
TIME (200µs/DIV)
Figure ADR381 Typical Noise Voltage,
Figure ADR381 Load Transient Response with
Rev. Page
02175-019
02175-018
02175-017
ADR380/ADR381
CBYPASS 0.1µF
VOUT
ZOUT (10/DIV)
1V/DIV
40pF
0.1µF
LOAD VLOAD
2V/DIV
ILOAD
02175-020
TIME (200µs/DIV)
FREQUENCY (Hz)
100k
Figure ADR381 Load Transient Response with
100nF
Figure ADR381 Output Impedance Frequency
VOUT
DRIFT (ppm)
1V/DIV
LOAD VLOAD
2V/DIV
ILOAD
-100 CONDITIONS: CONTROLLED ENVIRONMENT 50°C
02175-021
TIME (200µs/DIV)
HOURS
1000
Figure ADR381 Load Transient Response with
Figure ADR380 Long-Term Drift
2V/DIV
DRIFT (ppm)
VOUT
5V/DIV
-100 CONDITIONS: CONTROLLED ENVIRONMENT 50°C
02175-022
TIME (200µs/DIV)
HOURS
1000
Figure ADR381 Turn-On/Turn-Off Response
Figure ADR381 Long-Term Drift
Rev. Page
02175-025
-150
02175-024
-150
02175-023
ADR380/ADR381 TERMINOLOGY
Temperature Coefficient change output voltage over operating temperature change normalized output voltage 25°C, expressed ppm/°C. equation follows:
TCVOUT [ppm/C] VOUT VOUT VOUT (25C)
Long-Term Stability typical shift output voltage over 1000 hours controlled temperature. Figure Figure show sample parts measured different intervals controlled environment 50°C 1000 hours.
VOUT VOUT [ppm] VOUT VOUT
where: VOUT (25°C) VOUT 25°C. VOUT (T1) VOUT Temperature VOUT (T2) VOUT Temperature Line Regulation change output voltage specified change input voltage. includes effects self-heating. Line regulation expressed either percent volt, parts-per-million volt, microvolts volt change input voltage. Load Regulation change output voltage specified change load current. includes effects self-heating. Load regulation expressed either microvolts milliampere, parts-per-million milliampere, ohms output resistance.
where: VOUT (t0) VOUT Time VOUT (t1) VOUT after 1000 hours operation controlled temperature. Note that 50°C chosen because most applications higher temperature than 25°C.
Thermal Hysteresis change output voltage after device cycled through temperature from +25°C -40°C +85°C back +25°C. This typical value from sample parts through such cycle.
VOUT VOUT (25C) VOUT VOUT [ppm] VOUT (25C) VOUT VOUT (25C)
where: VOUT (25°C) VOUT 25°C. VOUT_TC VOUT 25°C after temperature cycle from +25°C -40°C +85°C back +25°C.
Rev. Page
ADR380/ADR381 THEORY OPERATION
Band references high performance solution supply voltage power voltage reference applications, ADR380/ADR381 exception. However, uniqueness this product lies architecture. shown Figure ideal zero band voltage referenced output, ground. band cell consists pair Q52, running unequal current densities. difference results voltage with positive that amplified ratio R58/R54. This PTAT voltage, combined with Q52, produce stable band voltage. Reduction band curvature performed ratio resistors, R59. Precision laser trimming other patented circuit techniques used further enhance drift performance.
VOUT
DEVICE POWER DISSIPATION CONSIDERATIONS
ADR380/ADR381 capable delivering load currents with input voltage that ranges from (ADR381 only) When this device used applications with large input voltages, take care avoid exceeding specified maximum power dissipation junction temperature that result premature device failure. following formula calculate device's maximum junction temperature dissipation:
where: device power dissipation, junction ambient temperatures, respectively. device package thermal resistance.
INPUT CAPACITOR
input capacitor required ADR380/ADR381. There limit value capacitor used input, capacitor input improves transient response applications where load current suddenly increases.
OUTPUT CAPACITOR
02175-026
Figure Simplified Schematic
ADR380/ADR381 need output capacitor stability under load condition. Using output capacitor, typically removes very level noise voltage does affect operation part. only parameter that degrades applying output capacitor turn-on time. (This varies depending size capacitor.) Load transient response also improved with output capacitor, which acts source stored energy sudden increase load current.
Rev. Page
ADR380/ADR381 APPLICATIONS INFORMATION
STACKING REFERENCE ARBITRARY OUTPUTS
Some applications require reference voltage sources, which combined standard outputs. following circuit shows this stacked output reference implemented:
0.1µF VOUT VOUT2
(current-switching mode) amplification (voltage-switching mode) output voltage. general, positive voltage reference converted into negative voltage reference through operational amplifier pair matched resistors inverting configuration. disadvantage this approach that largest single source error circuit relative matching resistors used. circuit Figure avoids need tightly matched resistors with active integrator circuit. this circuit, output voltage reference provides input drive integrator. integrator, maintain circuit equilibrium, adjusts output establish proper relationship between reference VOUT GND. Thus, negative output voltage desired chosen substituting appropriate reference precaution should noted with this approach: although rail-to-rail output amplifiers work best application, these operational amplifiers require finite amount (mV) headroom when required provide load current. choice circuit's negative supply should take this issue into account.
0.1µF VOUT 100k
ADR380/ ADR381
VOUT
VOUT1 3.9k
02175-027
0.1µF
ADR380/ ADR381
Figure Stacking Voltage References with ADR380/ADR381
ADR380s ADR381s used; outputs individual references simply cascaded reduce supply current. Such configuration provides output voltages: VOUT1 VOUT2. VOUT1 terminal voltage while VOUT2 this voltage terminal voltage chosen different voltages that supply required outputs. While this concept simple, precaution order. Because lower reference circuit must sink small bias current from plus base current from series output transistor external load either must provide path this current. minimum load well-defined, Resistor should used, value that conservatively passes current with applicable VOUT1 across Note that reference circuits locally treated macrocells, each having bypasses input output optimum stability. Both this circuit source currents their full rating. minimum input voltage, VIN, determined outputs, VOUT2, plus dropout voltage
ADR380/ ADR381
-VREF
02175-028
OP195
Figure Negative Precision Voltage Reference Using Precision Resistors
PRECISION CURRENT SOURCE
Many times power applications, need arises precision current source that operate supply voltages. shown Figure ADR380/ADR381 configured precision current source. circuit configuration illustrated floating current source with grounded load. reference output voltage bootstrapped across RSET P1), which sets output current into load. With this configuration, circuit precision maintained load currents range from reference supply current, typically approximately
0.1µF VOUT ADJUST
NEGATIVE PRECISION REFERENCE WITHOUT PRECISION RESISTORS
many current-output CMOS applications where output signal voltage must same polarity reference voltage, often required reconfigure currentswitching into voltage-switching through 1.25 reference, amp, pair resistors. Using current switching directly requires additional operational amplifier output reinvert signal. negative voltage reference then desirable from point that additional operational amplifier required either reinversion
Rev. Page
ADR380/ ADR381
IOUT
02175-029
Figure Precision Current Source
ADR380/ADR381
PRECISION HIGH CURRENT VOLTAGE SOURCE
some cases, user want higher output current delivered load still achieve better than 0.5% accuracy from ADR380/ADR381. accuracy reference normally specified data sheet with load. However, output voltage changes with load current. circuit Figure provides high current without compromising accuracy ADR380/ADR381. action, VOUT follows VREF with very drop maintain circuit equilibrium, also drives N-Channel MOSFET into saturation maintain current needed different loads. optional prevent oscillation such approach, hundreds milliamps load current achieved, current limited thermal limitation VOUT
100k 0.001µF
2N7002 VOUT
VOUT
AD820
ADR380/ ADR381
Figure ADR380/ADR381 Precision High Current Voltage Source
Rev. Page
02175-030
ADR380/ADR381 OUTLINE DIMENSIONS
3.04 2.90 2.80 1.40 1.30 1.20
2.64 2.10
0.60 0.45 1.02 0.95 0.88 0.100 0.013 SEATING PLANE 2.05 1.78
1.03 0.89 0.54
1.12 0.89
GAUGE PLANE
0.180 0.085 0.51 0.37 0.25 0.60 0.30
011909-C
COMPLIANT JEDEC STANDARDS TO-236-AB
Figure 3-Lead Small Outline Transistor Package [SOT-23-3] (RT-3) Dimensions shown millimeters
1.55 1.50 1.45
4.10 4.00 3.90
2.05 2.00 1.95
1.10 1.00 0.90
1.10 1.00 0.90
REEL 100.00 REEL 330.00 0.35 0.30 0.25 20.20
14.40
8.30 8.00 7.70
3.55 3.50 3.45 3.20 3.10 2.90 1.00 0.75
2.80 2.70 2.60
1.50
13.20 13.00 12.80
REEL 50.00 REEL 100.00
DIRECTION UNREELING
Figure Tape Reel Dimensions Dimensions shown millimeters
ORDERING GUIDE
Model ADR380ARTZ-REEL71 ADR381ART-REEL7 ADR381ARTZ-R21 ADR381ARTZ-REEL71
Temperature Range -40°C +85°C -40°C +85°C -40°C +85°C -40°C +85°C
Package Description 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23 3-Lead SOT-23
Package Option RT-3 RT-3 RT-3 RT-3
Branding R2D2 R3A#
Output Voltage 2.048 2.500 2.500 2.500
Ordering Quantity 3,000 3,000 3,000
RoHS Compliant Part, denotes RoHS compliant product bottom marked. Prior Date Code 0542, parts were branded with without
Rev. Page
053006-0
9.90 8.40 6.90
ADR380/ADR381 NOTES
Rev. Page
ADR380/ADR381 NOTES
©2001-2009 Analog Devices, Inc. rights reserved. Trademarks registered trademarks property their respective owners. D02175-0-1/09(B)
Rev. Page
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