CONFIGURATION 5-Lead SOT-23 Suffix) FEATURES Initial Accuracy: TC
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Precision Drift 2.048 V/2.5 V/4.096 SOT-23 Reference with Shutdown ADR390/ADR391/ADR392/ADR395
CONFIGURATION 5-Lead SOT-23 Suffix)
FEATURES Initial Accuracy: TCVO: ppm/ Load Regulation: ppm/mA Line Regulation: ppm/V Supply Headroom: Wide Operating Range: (VOUT Power: Shutdown Less Than Output Current: Wide Temperature Range: ADR390, ADR391 +125 ADR392, ADR395 Tiny 5-Lead SOT-23 Package APPLICATIONS Battery-Powered Instrumentation Portable Medical Instruments Data Acquisition Systems Industrial Process Control Systems Fault Protection Critical Systems Automotive GENERAL DESCRIPTION
SHDN
VOUT (SENSE) (Not Scale) VOUT (FORCE)
ADR390/ ADR391/ ADR392/ ADR395
Table ADR39x Products
Part Number ADR390 ADR391 ADR392 ADR395
Nominal Output Voltage 2.048 2.500 4.096 5.000
ADR390, ADR391, ADR392, ADR395 precision 2.048 4.096 band voltage references featuring high accuracy stability power consumption tiny footprint. Patented temperature drift curvature correction techniques minimize nonlinearity voltage change with temperature. wide operating range power consumption with additional shutdown capability make them ideal battery-powered applications. VOUT Sense enables greater accuracy supporting full Kelvin operation PCBs employing thin long traces. ADR390, ADR391, ADR392, ADR395 micropower, dropout voltage (LDV) devices that provide stable output voltage from supplies above output voltage. ADR390 ADR391 specified over industrial range (-40C +85C), while ADR392 ADR395 specified over extended industrial range (-40C +125C). Each available tiny 5-lead SOT-23 package. combination VOUT sense shutdown functions also enables number unique applications combining precision reference/regulation with fault decision overcurrent protection. Details provided Applications section.
REV.
Information furnished Analog Devices believed accurate reliable. However, responsibility assumed Analog Devices use, infringements patents other rights third parties that result from use. license granted implication otherwise under patent patent rights Analog Devices. Technology Way, P.O. 9106, Norwood, 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 Analog Devices, Inc., 2002
ADR390/ADR391/ADR392/ADR395
ADR390 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Parameter Initial Accuracy 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 Shutdown Supply Current Shutdown Logic Input Current Shutdown Logic Shutdown Logic High Symbol VOERR TCVO ILOAD VO_HYS ISHDN ILOGIC VINL VINH
unless otherwise noted.)
Conditions 2.042 0.29 -40C +85C -40C +85C ILOAD -40C +85C Load -40C +85C 2.048 2.054 0.29 Unit ppm/C ppm/V ppm/mA ppm/1000
15.0
*The long-term stability specification noncumulative. drift subsequent 1000 hour periods significantly lower than first 1000 hour period. Specifications subject change without notice.
ADR391 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Parameter Initial Accuracy Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Symbol VOERR TCVO ILOAD VO_HYS ILOGIC VINL VINH
unless otherwise noted.)
Conditions 2.494 0.24 -40C +85C -40C +85C ILOAD -40C +85C Load -40C +85C 2.506 0.24 Unit ppm/C ppm/V
Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability* Output Voltage Hysteresis Ripple Rejection Ratio Short Circuit Shutdown Supply Current Shutdown Logic Input Current Shutdown Logic Shutdown Logic High
15.0
ppm/mA ppm/1000
*The long-term stability specification noncumulative. drift subsequent 1000 hour periods significantly lower than first 1000 hour period. Specifications subject change without notice.
REV.
ADR390/ADR391/ADR392/ADR395
ADR392 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Parameter Initial Accuracy Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Symbol VOERR TCVO ILOAD VO_HYS ILOGIC VINL VINH
unless otherwise noted.)
Conditions 4.090 0.15 -40C +125C -40C +125C ILOAD -40C +125C Load -40C +125C 4.096 4.912 0.15 Unit ppm/C ppm/V
Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability* Output Voltage Hysteresis Ripple Rejection Short Circuit Shutdown Supply Current Shutdown Logic Input Current Shutdown Logic Shutdown Logic High
15.0
ppm/mA ppm/1000
*The long-term stability specification noncumulative. drift subsequent 1000 hour periods significantly lower than first 1000 hour period. Specifications subject change without notice.
ADR395 SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
Parameter Initial Accuracy Initial Accuracy Error Temperature Coefficient Minimum Supply Voltage Headroom Line Regulation Load Regulation Symbol VOERR TCVO ILOAD VO_HYS ILOGIC VINL VINH
unless otherwise noted.)
Conditions 4.994 0.12 -40C +125C -40C +125C ILOAD -40C +125C Load -40C +125C 5.000 5.006 0.12 Unit ppm/C ppm/V
Quiescent Current Voltage Noise Turn-On Settling Time Long-Term Stability* Output Voltage Hysteresis Ripple Rejection Short Circuit Shutdown Supply Current Shutdown Logic Input Current Shutdown Logic Shutdown Logic High
15.0
ppm/mA ppm/1000
*The long-term stability specification noncumulative. drift subsequent 1000 hour periods significantly lower than first 1000 hour period. Specifications subject change without notice.
REV.
ADR390/ADR391/ADR392/ADR395
ABSOLUTE MAXIMUM RATINGS
Supply Voltage Output Short-Circuit Duration Observe Derating Curves Storage Temperature Range Package -65C +150C Operating Temperature Range ADR390/ADR391 -40C +85C ADR392/ADR395 -40C +125C Junction Temperature Range Package -65C +150C Lead Temperature Range (Soldering, Sec) 300C
Package Type 5-Lead SOT-23 (RT)
Unit
NOTES Absolute Maximum Ratings apply 25C, unless otherwise noted. Stresses above those listed under Absolute Maximum Ratings cause permanent damage device. This stress rating only; functional operation device these other conditions above those listed operational sections this specification implied. Exposure absolute maximum rating conditions extended periods affect device reliability.
ORDERING GUIDE
Model ADR390ART-RL7 ADR390ART-RL ADR391ART-RL7 ADR391ART-RL ADR392ART-RL7 ADR392ART-RL ADR395ART-RL7
Temperature Range -40C +85C -40C +85C -40C +85C -40C +85C -40C +125C -40C +125C -40C +125C
Package Description 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23 5-Lead SOT-23
Package Option RT-5 RT-5 RT-5 RT-5 RT-5 RT-5 RT-5
Mark
Output Voltage 2.048 2.048 2.500 2.500 4.096 4.096 5.000
Number Parts Reel 3,000 10,000 3,000 10,000 3,000 10,000 3,000
CAUTION (electrostatic discharge) sensitive device. Electrostatic charges high 4000 readily accumulate human body test equipment discharge without detection. Although ADR390/ADR391/ADR392/ADR395 features proprietary protection circuitry, permanent damage occur devices subjected high energy electrostatic discharges. Therefore, proper precautions recommended avoid performance degradation loss functionality.
WARNING!
SENSITIVE DEVICE
REV.
ADR390/ADR391/ADR392/ADR395
PARAMETER DEFINITION Temperature Coefficient (TCV
change output voltage over operating temperature change normalized output voltage 25C, expressed ppm/C. equation follows:
TCVO
where: VO(25C)
(25C
response improved with additional output capacitor parallel. capacitor here will source stored energy sudden increase load current. only parameter that will degrade, adding output capacitor, turn-on time depends size capacitor chosen.
Long-Term Stability
Typical shift output voltage over 1000 hours controlled temperature. Figure shows sample parts measured different intervals controlled environment 1000 hours.
VO(T1) temperature1 VO(T2) temperature2
Line Regulation VIN)
where: VO(t0) time
change output voltage specified change input voltage. includes effects self-heating. Line regulation expressed either percent volt, parts million volt, microvolts volt change input voltage.
Load Regulation ILOAD)
VO(t1) after 1000 hours operation controlled temperature
Thermal Hysteresis (VO_HYS)
change output voltage specified change load current. includes effects self-heating. Load regulation expressed either microvolts milliampere, parts million milliampere, output resistance.
Input Capacitor
change output voltage after device cycled through temperature from +25C -40C +85C back +25C. This typical value from sample parts through such cycle.
Input capacitors required ADR39x. There limit value capacitor used input, capacitor input will improve transient response applications where supply suddenly changes. additional parallel will also help reducing noise from supply.
Output Capacitor
(25C
(25C (25C
where: VO(25C)
ADR39x does need output capacitors stability under load condition. output capacitor, typically will filter level noise voltage will affect operation part. other hand, load transient
VO_TC after temperature cycle +25C -40C +85C back +25C
DATA TAKEN CONTROLLED ENVIRONMENT
DRIFT
TIME Hours
1040
Figure ADR391 Typical Long-Term Drift over 1000 Hours
REV.
ADR390/ADR391/ADR392/ADR395 -Typical Performance Characteristics
2.054 SAMPLE 2.052
5.004 SAMPLE 5.006
2.050
VOUT
5.002
2.048
SAMPLE
VOUT
SAMPLE 5.000 SAMPLE 4.998
2.046
2.044
SAMPLE
4.996
2.042 TEMPERATURE
4.994
TEMPERATURE
ADR390 Output Voltage Temperature
ADR395 Output Voltage Temperature
2.506
2.504
SAMPLE 2.502
VOUT
SUPPLY CURRENT
SAMPLE 2.500
2.498 SAMPLE 2.496
2.494 TEMPERATURE
10.0 INPUT VOLTAGE
12.5
15.0
ADR391 Output Voltage Temperature
ADR390 Supply Current Input Voltage
4.100
4.098
SAMPLE 4.096 SAMPLE VOUT 4.094 SAMPLE 4.092
SUPPLY CURRENT
4.090
4.088
TEMPERATURE
10.0 INPUT VOLTAGE
12.5
15.0
ADR392 Output Voltage Temperature
ADR391 Supply Current Input Voltage
REV.
ADR390/ADR391/ADR392/ADR395
LOAD REGULATION ppm/mA
+125
SUPPLY CURRENT
3.5V 5.0V
INPUT VOLTAGE
TEMPERATURE
ADR392 Supply Current Input Voltage
ADR391 Load Regulation Temperature
LINE REGULATION ppm/mA
+125 7.5V
SUPPLY CURRENT
10.0 11.5 INPUT VOLTAGE
13.0
14.5
TEMPERATURE
ADR395 Supply Current Input Voltage
ADR392 Load Regulation Temperature
LOAD REGULATION ppm/mA
LOAD REGULATION ppm/mA
7.5V
3.0V 5.0V
TEMPERATURE
TEMPERATURE
ADR390 Load Regulation Temperature
ADR395 Load Regulation Temperature
REV.
ADR390/ADR391/ADR392/ADR395
2.5V
LINE REGULATION ppm/V
LINE REGULATION ppm/V 5.3V
TEMPERATURE
TEMPERATURE
ADR390 Line Regulation Temperature
ADR395 Line Regulation Temperature
2.8V
LINE REGULATION ppm/V
2.848
2.648 VIN_MIN
2.448 2.248
TEMPERATURE
2.048
LOAD CURRENT
ADR391 Line Regulation Temperature
ADR390 Minimum Input Voltage Load Current
3.30
LINE REGULATION ppm/V 3.10
4.4V
VIN_MIN
2.90
2.70
2.50 TEMPERATURE
LOAD CURRENT
ADR392 Line Regulation Temperature
ADR391 Minimum Input Voltage Load Current
REV.
ADR390/ADR391/ADR392/ADR395
TEMPERATURE: +125 VIN_MIN
FREQUENCY
LOAD CURRENT
0.56
0.41
0.11 0.26 0.04 VOUT DEVIATION
0.19
0.34
ADR392 Minimum Input Voltage Load Current
ADR391 VOUT Hysteresis Distribution
+125 VIN_MIN
VOLTAGE NOISE DENSITY
ADR391
ADR390
LOAD CURRENT
FREQUENCY
ADR395 Minimum Input Voltage Load Current
Voltage Noise Density Frequency
TEMPERATURE:
VOLTAGE V/DIV
FREQUENCY
0.24
0.18
0.12
0.06 0.06 0.12 VOUT DEVIATION
0.18
0.24
0.30
TIME Sec/DIV
ADR390 VOUT Hysteresis Distribution
ADR391 Typical Voltage Noise
REV.
ADR390/ADR391/ADR392/ADR395
TIME 10ms/DIV
VOUT
VOLTAGE V/DIV
VOLTAGE 1V/DIV
VLOAD TIME s/DIV LOAD
ADR391 Voltage Noise
ADR391 Load Transient Response
CBYPASS
VOLTAGE 1V/DIV
VOUT
LINE INTERRUPTION
0.5V/DIV
VOLTAGE
LOAD VLOAD
VOUT TIME s/DIV
1V/DIV
TIME s/DIV
ADR391 Line Transient Response
ADR391 Load Transient Response
CBYPASS VOUT TIME s/DIV 1V/DIV LINE INTERRUPTION
100nF VOUT
VOLTAGE 1V/DIV
0.5V/DIV
VOLTAGE
LOAD VLOAD TIME s/DIV
ADR391 Line Transient Response
ADR391 Load Transient Response
-10-
REV.
ADR390/ADR391/ADR392/ADR395
5V/DIV VOUT TIME s/DIV 2V/DIV VOUT
VOLTAGE VOLTAGE
2V/DIV
TIME s/DIV 5V/DIV
ADR391 Turn-On Response Time
ADR391 Turn-On/Turn-Off Response
VOLTAGE 5V/DIV
100nF 2V/DIV VOUT 5V/DIV
5V/DIV
VOLTAGE
TIME s/DIV VOUT 2V/DIV
TIME s/DIV
ADR391 Turn-Off Response
ADR391 Turn-On/Turn-Off Response
CBYPASS 2V/DIV VOUT
RIPPLE REJECTION
FREQUENCY 100k
VOLTAGE
5V/DIV
TIME s/DIV
ADR391 Turn-On/Turn-Off Response
Ripple Rejection Frequency
REV.
-11-
ADR390/ADR391/ADR392/ADR395
OUTPUT IMPEDANCE
Device Power Dissipation Considerations
ADR390/ADR391/ADR392/ADR395 capable delivering load currents with input voltage that ranges from (ADR391 only) When this device used applications with large input voltages, care should taken avoid exceeding specified maximum power dissipation junction temperature that could result premature device failure. following formula should used calculate device's maximum junction temperature dissipation:
FREQUENCY
100k
Output Impedance Frequency
THEORY OPERATION
this equation, are, respectively, junction ambient temperatures, device power dissipation, device package thermal resistance.
Shutdown Mode Operation
Band references high performance solution supply voltage power voltage reference applications, ADR390/ADR391/ADR392/ADR395 exception. uniqueness this product lies architecture. observing Figure ideal zero band voltage referenced output, ground. Therefore, noise exists ground line, will greatly attenuated VOUT. band cell consists pair Q52, running unequal current densities. difference results voltage with positive which amplified ratio This PTAT voltage, combined with VBEs Q52, produces stable band voltage. Reduction band curvature performed ratio resistors R59, which linearly temperature dependent. Precision laser trimming other patented circuit techniques used further enhance drift performance.
ADR390/ADR391/ADR392/ADR395 includes shutdown feature that TTL/CMOS level compatible. logic zero volt condition SHDN required turn device off. During shutdown, output reference becomes high impedance state where potential would then determined external circuitry. shutdown feature used, SHDN should connected (Pin
APPLICATIONS BASIC VOLTAGE REFERENCE CONNECTION
circuit Figure illustrates basic configuration ADR39x family. Decoupling capacitors required circuit stability. ADR39x family capable driving capacitive loads from However, ceramic output capacitor recommended absorb deliver charge required dynamic load.
SHUTDOWN INPUT SHDN VOUT(S) VOUT(F)
ADR39x
VOUT (FORCE) VOUT (SENSE)
REQUIRED
OUTPUT
Figure Basic Configuration ADR39x Family
Stacking Reference Arbitrary Outputs
SHDN
Some applications require reference voltage sources, which combined standard outputs. Figure circuit shows this "stacked output" reference implemented:
Figure Simplified Schematic
-12-
REV.
ADR390/ADR391/ADR392/ADR395
OUTPUT TABLE U1/U2 ADR390/ADR390 ADR391/ADR391 ADR392/ADR392 ADR395/ADR395 VOUT1 VOUT2 2.048 4.096 4.096 8.192
OUT(F) OUT(S) SHDN
+VDD
SHDN VOUT(F) VOUT(S)
-VDD
VOUT2
-VREF
Figure Negative Reference
SHDN VOUT(F) VOUT(S) VOUT1
General-Purpose Current Source
Figure Stacking Voltage References with ADR390/ADR391/ADR392/ADR395
reference used, from unregulated input, VIN. outputs individual simply connected series, which provides output voltages VOUT1 VOUT2. VOUT1 terminal voltage while VOUT2 this voltage terminal voltage simply chosen voltages that supply required outputs (see Output Table). example, both ADR391s, VOUT1 VOUT2 While this concept simple, precaution order. Since lower reference circuit must sink small bias current from plus base current from series output transistor either external load must provide path this current. minimum load well defined, resistor should used, value that will conservatively pass current with applicable VOUT1 across Note that reference circuits locally treated macrocells, each having bypasses input output best stability. Both this circuit source currents their full rating. minimum input voltage, VIN, determined outputs, VOUT2, plus dropout voltage
Negative Precision Reference without Precision Resistors
Many times power applications, need arises precision current source that operate supply voltages. shown Figure ADR390/ADR391/ADR392/ADR395 configured precision current source. circuit configuration illustrated floating current source with grounded load. reference's output voltage bootstrapped across RSET, which sets output current into load. With this configuration, circuit precision maintained load currents range from reference's supply current, typically approximately
SHDN VOUT
ADR39x
VOUT ISET
ADJUST
(ISET)
RSET
IOUT ISET (ISET)
Figure General-Purpose Current Source
High Power Performance with Current Limit
negative reference easily generated adding amp, configured shown Figure VOUTF VOUTS virtual ground therefore negative reference taken directly from output amp. must dual supply, offset, rail-to-rail negative supply voltage close reference output.
some cases, user want higher output current delivered load still achieve better than 0.5% accuracy ADR39x. accuracy reference normally specified data sheet with load. However, output voltage changes with load current. circuit Figure provides high current without compromising accuracy ADR39x. series pass transistor provides load current. ADR39x delivers only base drive through force pin. sense ADR39x regulated output connected load. transistor protects during short circuit limit faults robbing base drive. maximum current ILMAX V/RS.
REV.
-13-
ADR390/ADR391/ADR392/ADR395
4.7k SHDN VOUT (FORCE) VOUT (SENSE) Q2N2222 Q2N4921
4.7k SHDN VOUT (FORCE) VOUT (SENSE) Q2N2222 Q2N4921
ADR39x
ADR39x
Figure ADR39x High Power Performance with Current Limit
Figure ADR39x High Output Current with Darlington Drive Configuration
similar circuit function also achieved with Darlington transistor configuration (see Figure
-14-
REV.
ADR390/ADR391/ADR392/ADR395
OUTLINE DIMENSIONS
5-Lead Plastic Surface-Mount Package [SOT-23] (RT-5)
Dimensions shown millimeters
2.90
1.60
2.80
0.95 1.30 1.15 0.90 1.90
1.45
0.15
0.50 0.30
SEATING PLANE
0.22 0.08
0.60 0.45 0.30
COMPLIANT JEDEC STANDARDS MO-178AA
REV.
-15-
ADR390/ADR391/ADR392/ADR395 Revision History
Location 10/02-Data Sheet changed from REV. REV. Page
parts ADR392 ADR395 Universal Changes GENERAL DESCRIPTION Additions Table Changes SPECIFICATIONS Changes ORDERING GUIDE Changes ABSOLUTE MAXIMUM RATINGS TPCs Figures Deleted Negative Precision Reference without Precision Resistors section Edits General-Purpose Current Source section Updated OUTLINE DIMENSIONS
5/02-Data Sheet changed from REV. REV.
C00419-0-10/02(C) PRINTED U.S.A.
Changes FEATURES
Change Figure Edits layout .Universal
-16-
REV.
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