ADR365B中文资料
Low Power, Low Noise Voltage References
with Sink/Source Capability
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366 Rev. A
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. T rademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, M A 02062-9106, U.S.A. Tel: 781.329.4700 https://www.sodocs.net/doc/c04751606.html, Fax: 781.461.3113 ?2006 Analog Devices, Inc. All rights reserved.
FEATURES
Compact TSOT-23-5 packages
Low temperature coefficient
B grade: 9 ppm/°C
A grade: 25 ppm/°C
Initial accuracy
B grade: ±3 mV maximum
A grade: ±6 mV maximum
Ultralow output noise: 6.8 μV p-p (0.1 Hz to 10 Hz) Low dropout: 300 mV
Low supply current: 190 μA maximum
No external capacitor required
Output current: +5 mA/?1 mA
Wide temperature range: ?40°C to +125°C
APPLICATIONS
Battery-powered instrumentations
Portable medical instrumentations
Data acquisition systems
Industrial process controls
Automotive
PIN CONFIGURATION
5
4
6
7
-
1
NC
GND
V IN OUT
NC = NO CONNECT
Figure 1. 5-Lead TSOT (UJ Suffix)
Table 1.
Model
V OUT
(V)1
Temperature
Coefficient (ppm/°C) Accuracy (mV) ADR360B 2.048 9 ±3
ADR360A 2.048 25 ±6
ADR361B 2.5 9 ±3
ADR361A 2.5 25 ±6
ADR363B 3.0 9 ±3
ADR363A 3.0 25 ±6
ADR364B 4.096 9 ±4
ADR364A 4.096 25 ±8
ADR365B 5.0 9 ±4
ADR365A 5.0 25 ±8
ADR366B 3.3 9 ±4
ADR366A 3.3 25 ±8
1 Contact Analog Devices, Inc. for other voltage options.
GENERAL DESCRIPTION
The ADR360/ADR361/ADR363/ADR364/ADR365/ADR366 are precision 2.048 V, 2.5 V, 3.0 V, 4.096 V, 5.0 V, and 3.3 V band gap voltage references that feature low power, high precision in tiny footprints. Using Analog Devices’ patented temperature drift curvature correction techniques, the ADR36x references achieve a low temperature drift of 9 ppm/°C in the TSOT package.
The ADR36x family of micropower, low dropout voltage references provides a stable output voltage from a minimum supply of 300 mV above the output. Their advanced design eliminates the need for external capacitors, which further reduces board space and system cost. The combination of low power operation, small size, and ease of use makes the ADR36x precision voltage references ideally suited for battery-operated applications.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 2 of 20
TABLE OF CONTENTS
Features..............................................................................................1 Applications.......................................................................................1 Pin Configuration.............................................................................1 General Description.........................................................................1 Revision History...............................................................................2 ADR360—Specifications.................................................................3 ADR361—Specifications.................................................................4 ADR363—Specifications.................................................................5 ADR364—Specifications.................................................................6 ADR365—Specifications.................................................................7 ADR366—Specifications.................................................................8 Absolute Maximum Ratings............................................................9 Thermal Resistance.......................................................................9 ESD Caution...................................................................................9 Terminology....................................................................................10 Typical Performance Characteristics...........................................11 Theory of Operation......................................................................16 Device Power Dissipation Considerations..............................16 Input Capacitor...........................................................................16 Output Capacitor........................................................................16 Applications.....................................................................................17 Basic Voltage Reference Connection.......................................17 Outline Dimensions.......................................................................19 Ordering Guide.. (19)
REVISION HISTORY
3/06—Rev. 0 to Rev. A
Changes to Figure 15 Caption.......................................................13 Changes to Figure 21 Caption.......................................................14 Changes to Theory of Operation Section.....................................16Changes to Figure 36.......................................................................18 4/05—Revision 0: Initial Version
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 3 of 20
ADR360—SPECIFICATIONS
Electrical Characteristics (V IN = 2.35 V to 15 V , T A = 25°C, unless otherwise noted.) Table 2.
Parameter Symbol Conditions M in Typ M ax Unit OUTPUT VOLTAGE V O A Grade 2.042 2.048 2.054 V B Grade 2.045 2.048 2.051 V INITIAL ACCURACY V OERR A Grade 6 mV A Grade 0.29 % B Grade 3 mV B Grade 0.15 % A Grade, ?40°C < T A < +125°C 25 ppm/°C
TEMPERATURE COEFFICIENT TCV O B Grade, ?40°C < T A < +125°C 9 ppm/°C
SUPPLY VOLTAGE HEADROOM V IN ? V O 300 mV LINE REGULATION ?V O /?V IN V IN = 2.45 V to 15 V, ?40°C < T A < +125°C 0.105 mV/V I LOAD = 0 mA to 5 mA, ?40°C < T A < +125°C, V IN = 3 V 0.37 mV/mA
LOAD REGULATION ?V O /?I LOAD I LOAD = ?1 mA to 0 mA, ?40°C < T A < +125°C, V IN = 3 V 0.82 mV/mA
QUIESCENT CURRENT I IN ?40°C < T A < +125°C 150 190 μA VOLTAGE NOISE e N p-p 0.1 Hz to 10 Hz 6.8 μV p-p TURN-ON SETTLING TIME t R 25 μs
LONG-TERM STABILITY 1
?V O 1,000 hours 50 ppm OUTPUT VOLTAGE HYSTERESIS ?V O_HYS 100 ppm RIPPLE REJECTION RATIO RRR f IN = 60 kHz 70 dB V IN = 5 V 25 mA
SHORT CIRCUIT TO GND I SC V IN = 15 V 30 mA
1
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods are significantly lower than in the first 1,000 hour period.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 4 of 20
ADR361—SPECIFICATIONS
Electrical Characteristics (V IN = 2.8 V to 15 V , T A = 25°C, unless otherwise noted.) Table 3.
Parameter Symbol Conditions M in Typ M ax Unit OUTPUT VOLTAGE V O A Grade 2.494 2.500 2.506 V B Grade 2.497 2.500 2.503 V INITIAL ACCURACY V OERR A Grade 6 mV A Grade 0.24 % B Grade 3 mV B Grade 0.12 % A Grade, ?40°C < T A < +125°C 25 ppm/°C
TEMPERATURE COEFFICIENT TCV O B Grade, ?40°C < T A < +125°C 9 ppm/°C
SUPPLY VOLTAGE HEADROOM V IN ? V O 300 mV LINE REGULATION ?V O /?V IN V IN = 2.8 V to 15 V, ?40°C < T A < +125°C 0.125 mV/V I LOAD = 0 mA to 5 mA, ?40°C < T A < +125°C, V IN = 3.5 V 0.45 mV/mA
LOAD REGULATION ?V O /?I LOAD I LOAD = ?1 mA to 0 mA, ?40°C < T A < +125°C, V IN = 3.5 V 1 mV/mA
QUIESCENT CURRENT I IN ?40°C < T A < +125°C 150 190 μA VOLTAGE NOISE e N p-p 0.1 Hz to 10 Hz 8.25 μV p-p TURN-ON SETTLING TIME t R 25 μs
LONG-TERM STABILITY 1
?V O 1,000 hours 50 ppm OUTPUT VOLTAGE HYSTERESIS ?V O_HYS 100 ppm RIPPLE REJECTION RATIO RRR f IN = 60 kHz 70 dB V IN = 5 V 25 mA
SHORT CIRCUIT TO GND I SC V IN = 15 V 30 mA
1
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods are significantly lower than in the first 1,000 hour period.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 5 of 20
ADR363—SPECIFICATIONS
Electrical Characteristics (V IN = 3.3 V to 15 V , T A = 25°C, unless otherwise noted.) Table 4.
Parameter Symbol Conditions M in Typ M ax Unit OUTPUT VOLTAGE V O A Grade 2.994 3.000 3.006 V B Grade 2.997 3.000 3.003 V INITIAL ACCURACY V OERR A Grade 6 mV A Grade 0.2 % B Grade 3 mV B Grade 0.1 % A Grade, ?40°C < T A < +125°C 25 ppm/°C
TEMPERATURE COEFFICIENT TCV O B Grade, ?40°C < T A < +125°C 9 ppm/°C
SUPPLY VOLTAGE HEADROOM V IN ? V O 300 mV LINE REGULATION ?V O /?V IN V IN = 3.3 V to 15 V, ?40°C < T A < +125°C 0.15 mV/V I LOAD = 0 mA to 5 mA, ?40°C < T A < +125°C, V IN = 4 V 0.54 mV/mA
LOAD REGULATION ?V O /?I LOAD I LOAD = ?1 mA to 0 mA, ?40°C < T A < +125°C, V IN = 4 V 1.2 mV/mA
QUIESCENT CURRENT I IN ?40°C < T A < +125°C 150 190 μA VOLTAGE NOISE e N p-p 0.1 Hz to 10 Hz 8.7 μV p-p TURN-ON SETTLING TIME t R 25 μs
LONG-TERM STABILITY 1
?V O 1,000 hours 50 ppm OUTPUT VOLTAGE HYSTERESIS ?V O_HYS 100 ppm RIPPLE REJECTION RATIO RRR f IN = 60 kHz 70 dB V IN = 5 V 25 mA
SHORT CIRCUIT TO GND I SC V IN = 15 V 30 mA
1
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods are significantly lower than in the first 1,000 hour period.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 6 of 20
ADR364—SPECIFICATIONS
Electrical Characteristics (V IN = 4.4 V to 15 V , T A = 25°C, unless otherwise noted.) Table 5.
Parameter Symbol Conditions M in Typ M ax Unit OUTPUT VOLTAGE V O A Grade 4.088 4.096 4.104 V B Grade 4.092 4.096 4.100 V INITIAL ACCURACY V OERR A Grade 8 mV A Grade 0.2 % B Grade 4 mV B Grade 0.1 % A Grade, ?40°C < T A < +125°C 25 ppm/°C
TEMPERATURE COEFFICIENT TCV O B Grade, ?40°C < T A < +125°C 9 ppm/°C
SUPPLY VOLTAGE HEADROOM V IN ? V O 300 mV LINE REGULATION ?V O /?V IN V IN = 4.4 V to 15 V, ?40°C < T A < +125°C 0.205 mV/V I LOAD = 0 mA to 5 mA, ?40°C < T A < +125°C, V IN = 5 V 0.735 mV/mA
LOAD REGULATION ?V O /?I LOAD I LOAD = ?1 mA to 0 mA, ?40°C < T A < +125°C, V IN = 5 V 1.75 mV/mA
QUIESCENT CURRENT I IN ?40°C < T A < +125°C 150 190 μA VOLTAGE NOISE e N p-p 0.1 Hz to 10 Hz 11 μV p-p TURN-ON SETTLING TIME t R 25 μs
LONG-TERM STABILITY 1
?V O 1,000 hours 50 ppm OUTPUT VOLTAGE HYSTERESIS ?V O_HYS 100 ppm RIPPLE REJECTION RATIO RRR f IN = 60 kHz 70 dB V IN = 5 V 25 mA
SHORT CIRCUIT TO GND I SC V IN = 15 V 30 mA
1
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods are significantly lower than in the first 1,000 hour period.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 7 of 20
ADR365—SPECIFICATIONS
Electrical Characteristics (V IN = 5.3 V to 15 V , T A = 25°C, unless otherwise noted.) Table 6.
Parameter Symbol Conditions M in Typ M ax Unit OUTPUT VOLTAGE V O A Grade 4.992 5.000 5.008 V B Grade 4.996 5.000 5.004 V INITIAL ACCURACY V OERR A Grade 8 mV A Grade 0.16 % B Grade 4 mV B Grade 0.08 % A Grade, ?40°C < T A < +125°C 25 ppm/°C
TEMPERATURE COEFFICIENT TCV O B Grade, ?40°C < T A < +125°C 9 ppm/°C
SUPPLY VOLTAGE HEADROOM V IN ? V O 300 mV LINE REGULATION ?V O /?V IN V IN = 5.3 V to 15 V, ?40°C < T A < +125°C 0.25 mV/V I LOAD = 0 mA to 5 mA, ?40°C < T A < +125°C, V IN = 6V 0.9 mV/mA
LOAD REGULATION ?V O /?I LOAD I LOAD = ?1 mA to 0 mA, ?40°C < T A < +125°C, V IN = 6 V 2 mV/mA
QUIESCENT CURRENT I IN ?40°C < T A < +125°C 150 190 μA VOLTAGE NOISE e N p-p 0.1 Hz to 10 Hz 12.8 μV p-p TURN-ON SETTLING TIME t R 20 μs
LONG-TERM STABILITY 1
?V O 1,000 hours 50 ppm OUTPUT VOLTAGE HYSTERESIS ?V O_HYS 100 ppm RIPPLE REJECTION RATIO RRR f IN = 60 kHz 70 dB V IN = 5 V 25 mA
SHORT CIRCUIT TO GND I SC V IN = 15 V 30 mA
1
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods are significantly lower than in the first 1,000 hour period.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 8 of 20
ADR366—SPECIFICATIONS
Electrical Characteristics (V IN = 3.6 V to 15 V , T A = 25°C, unless otherwise noted.) Table 7.
Parameter Symbol Conditions M in Typ M ax Unit OUTPUT VOLTAGE V O A Grade 3.292 3.300 3.308 V B Grade 3.296 3.300 3.304 V INITIAL ACCURACY V OERR A Grade 8 mV A Grade 0.25 % B Grade 4 mV B Grade 0.125 % A Grade, ?40°C < T A < +125°C 25 ppm/°C
TEMPERATURE COEFFICIENT TCV O B Grade, ?40°C < T A < +125°C 9 ppm/°C
SUPPLY VOLTAGE HEADROOM V IN ? V O 300 mV LINE REGULATION ?V O /?V IN V IN = 3.6 V to 15 V, ?40°C < T A < +125°C 0.165 mV/V I LOAD = 0 mA to 5 mA, ?40°C < T A < +125°C, V IN = 4.2 V 0.6 mV/mA
LOAD REGULATION ?V O /?I LOAD I LOAD = ?1 mA to 0 mA, ?40°C < T A < +125°C, V IN = 4.2 V 1.35 mV/mA
QUIESCENT CURRENT I IN ?40°C < T A < +125°C 150 190 μA VOLTAGE NOISE e N p-p 0.1 Hz to 10 Hz 9.3 μV p-p TURN-ON SETTLING TIME t R 25 μs
LONG-TERM STABILITY 1
?V O 1,000 hours 50 ppm OUTPUT VOLTAGE HYSTERESIS ?V O_HYS 100 ppm RIPPLE REJECTION RATIO RRR f IN = 60 kHz 70 dB V IN = 5 V 25 mA
SHORT CIRCUIT TO GND I SC V IN = 15 V 30 mA
1
The long-term stability specification is noncumulative. The drift subsequent 1,000 hour periods are significantly lower than in the first 1,000 hour period.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 9 of 20
ABSOLUTE MAXIMUM RATINGS
T A = 25°C, unless otherwise noted. Table 8.
Parameter Rating Supply Voltage 18 V Output Short-Circuit Duration to GND V IN < 15 V Indefinite V IN > 15 V 10 sec Storage Temperature Range ?65°C to +125°C Operating Temperature Range ?40°C to +125°C
Junction Temperature Range ?65°C to +125°C
Lead Temperature (Soldering, 60 sec) 300°C
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. THERMAL RESISTANCE θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages. Table 9. Thermal Resistance
Package Type
θJA θJC Unit TSOT-23-5 (UJ-5)
230
146 °C/W
ESD CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the
human body and test equipment and can discharge without detection. Although this product features proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance
degradation or loss of functionality.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 10 of 20
TERMINOLOGY
Temperature Coefficient
The change of output voltage with respect to operating
temperature changes normalized by the output voltage at 25°C. This parameter is expressed in ppm/°C and can be determined by
()()()()
61212O 10C 25C]ppm/[×?×°?=°T T V T V T V TCV O O O where:
V O (25°C) = V O at 25°C.
V O (T 1) = V O at Temperature 1. V O (T 2) = V O at Temperature 2.
Line Regulation
The change in output voltage due to a specified change in input voltage. This parameter accounts for the effects of self-heating. Line regulation is expressed in either percent per volt, parts-per-million per volt, or microvolts per volt change in input voltage.
Load Regulation
The change in output voltage due to a specified change in load current. This parameter accounts for the effects of self-heating. Load regulation is expressed in either microvolts per
milliampere, parts-per-million per milliampere, or ohms of dc output resistance.
Long-Term Stability
Typical shift of output voltage at 25°C on a sample of parts subjected to a test of 1,000 hours at 25°C.
()()10t V t V V O O O ?=Δ
[]()()()???
?????×=Δ601010ppm t V t –V t V V O O O O where:
V O (t 0) = V O at 25°C at Time 0.
V O (t 1) = V O at 25°C after 1,000 hours operation at 25°C. Thermal Hysteresis
The change of output voltage after the device is cycled through temperature from +25°C to –40°C to +125°C and back to +25°C. This is a typical value from a sample of parts put through such a cycle.
()TC O O HYS O V V V __C 25?°= []()()
6__10C 25C 25ppm ×°?°=O TC
O O HYS O V V V V
where:
V O (25°C) = V O at 25°C.
V O_TC = V O at 25°C after temperature cycle at +25°C to –40°C to +125°C and back to +25°C.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 11 of 20
TYPICAL PERFORMANCE CHARACTERISTICS
2.052
2.044
–40
05467-002
TEMPERATURE (°C)
V O U T (V )
2.050
2.048
2.046–20020406080100120
Figure 2. ADR360 Output Voltage vs. Temperature
2.504
2.494
–40
05467-003
TEMPERATURE (°C)
V O U T (V )
125
2.5022.5002.498
2.496
–25–105203550658095110 Figure 3. ADR361 Output Voltage vs. Temperature
3.0032.996
–40
05467-004
TEMPERATURE (°C)
V O U T (V )
–200204060
80100120
3.0023.001
3.0002.9992.9982.997
Figure 4. ADR363 Output Voltage vs. Temperature
4.9984.990
–40
05467-005
TEMPERATURE (°C)
V O U T (V )
125
4.997
4.9964.995
4.9944.993
4.992
4.991–25
–105203550658095110
Figure 5. ADR365 Output Voltage vs. Temperature
0.165
0.115
2.8
05467-006
V IN (V)
I D D (m A )
0.155
0.145
0.135
0.125
4.1
5.3
6.6
7.89.110.311.612.814.1
Figure 6. ADR361 Supply Current vs. Input Voltage
0.17
0.14
5.3
05467-007
V IN (V)
I D D (m A )
0.16
0.15
6.3
7.3
8.3
9.310.311.312.313.314.3
Figure 7. ADR365 Supply Current vs. Input Voltage
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 12 of 20
0.180–40
12505467-036
TEMPERATURE (°C)
L O A D R E G U L A T I O N (m V /m A )
0.16
0.140.120.100.080.060.04
0.02–25–105203550658095110
Figure 8. ADR361 Load Regulation vs. Temperature
0.140–40
125
05467-037
TEMPERATURE (°C)
L O A D R E G U L A T I O N (m V /m A )
–25–1052035506580951100.12
0.100.080.060.040.02
Figure 9. ADR365 Load Regulation vs. Temperature
25
0–40
05467-008
TEMPERATURE (°C)L I N E R E G U L A T I O N (p p m /V )
–2002040
60801001202015
10
5
Figure 10. ADR360 Line Regulation vs. Temperature, V IN = 2.45 V to 15 V
90–40
05467-009
TEMPERATURE (°C)
L I N E R E G U L A T I O N (p p m /V )
125
–25–105203550658095
1108
765432
1
Figure 11. ADR361 Line Regulation vs. Temperature, V IN = 2.8 V to 15 V
12
0–40
05467-010
TEMPERATURE (°C)
L I N E R E G U L A T I O N (p p m /V )
–200204060
80100120
10
8
6
4
2
Figure 12. ADR365 Line Regulation vs. Temperature, V IN = 5.3 V to 15 V
1.60–2
05467-011
LOAD CURRENT (mA)
D I F F
E R E N T I A L V O L T A G E (V )
10
1.4
1.21.00.80.60.4
0.202468
Figure 13. ADR361 Minimum Input Voltage vs. Load Current
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 13 of 20
1.80–2
05467-012
LOAD CURRENT (mA)
D I F F
E R E N T I A L V O L T A G E (V )
10
2
4
6
8
1.6
1.41.21.00.80.60.4
0.2
Figure 14. ADR365 Minimum Input Voltage vs. Load Current
05467-013
2μV/DIV
TIME = 1s/DIV
Figure 15. ADR361 0.1 Hz to 10 Hz Noise
05467-014
50μV/DIV
TIME = 1s/DIV
Figure 16. ADR361 10 Hz to 10 kHz Noise
05467-015
TIME = 1s/DIV
2μV/DIV
Figure 17. ADR363 0.1 Hz to 10 kHz Noise
05467-016
50μV/DIV
TIME = 1s/DIV
Figure 18. ADR363 10 Hz to 10 kHz Noise
05467-017
2μV/DIV
TIME = 1s/DIV
Figure 19. ADR365 0.1 Hz to 10 Hz Noise
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 14 of 20
05467-018
100μV/DIV
TIME = 1s/DIV
Figure 20. ADR365 10 Hz to 10 kHz Noise
500100
100k
05467-031
FREQUENCY (Hz)
O U T P U T I M P E D A N C E (Ω)
4540
353025201510
51k
10k
Figure 21. Output Impedance vs. Frequency
10–90
1M
05467-030
FREQUENCY (Hz)
R I P P L E R E J E C T I O N (d B )
0–10
–20–30–40–50–60–70–80100
1k
10k
100k
Figure 22. Ripple Rejection Ratio
05467-019
Figure 23. ADR361 Line Transient Response (Increasing), No Capacitors
05467-020
Figure 24. ADR361 Line Transient Response (Decreasing), No Capacitors
05467-021
Figure 25. ADR361 Line Transient Response, 0.1 μF Input Capacitor
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 15 of 20
05467-032
2ms/DIV 100mV/DIV
LOAD ON
LOAD OFF
V OUT
Figure 26. ADR361 Load Transient Response
05467-033
100mV/DIV
LOAD ON
V OUT
100μs/DIV
Figure 27. ADR361 Load Transient Response,
0.1 μF Input, Output Capacitor
05467-0
22
Figure 28. ADR361 Turn-On Response Time at 5 V
05467
-023
Figure 29. ADR361 Turn-Off Response at 5 V
05467-034
5V/DIV
2V/DIV
100μs/DIV
V OUT
V IN
Figure 30. ADR361 Turn-On Response, 0.1 μF Output Capacitor
05467-035
2V/DIV
5V/DIV
V IN
V OUT
2ms/DIV
Figure 31. ADR361 Turn-Off Response, 0.1 μF Output Capacitor
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 16 of 20
THEORY OF OPERATION
Band gap references are the high performance solution for low supply voltage and low power voltage reference applications, and the ADR36x family is no exception. The uniqueness of these products lies in their architecture. The ideal zero TC band gap voltage is referenced to the output not to ground (see Figure 32). Therefore, if noise exists on the ground line, it is greatly attenuated on V OUT . The band gap cell consists of the PNP pair Q53 and Q52 running at unequal current densities. The difference in V BE results in a voltage with a positive TC, which is amplified by a ratio of
R54
R592× This PTAT voltage, combined with the V BE s of Q53 and Q52, produces the stable band gap voltage.
Reduction in the band gap curvature is performed by the ratio of Resistor R44 and Resistor R59, one of which is linearly temperature dependent. Precision laser trimming and other patented circuit techniques are used to further enhance the drift performance.
05467-024
TRIM
Figure 32. Simplified Schematic
DEVICE POWER DISSIPATION CONSIDERATIONS
The ADR36x family is capable of delivering load currents to 5 mA with an input voltage ranging from 2.348 V (ADR360 only) to 18 V . When this device is used in applications with large input voltages, care should be taken to avoid exceeding the specified maximum power dissipation or junction temperature because it could result in premature device failure. Use the following formula to calculate a device’s maximum junction temperature or dissipation:
JA
A J D θT T P ?=
In this equation, T J and T A are, respectively, the junction and ambient temperatures, P D is the device power dissipation, and θJA is the device package thermal resistance.
INPUT CAPACITOR
Input capacitors are not required on the ADR36x. There is no limit for the value of the capacitor used on the input, but a 1 μF to 10 μF capacitor on the input improves transient response in applications where the supply suddenly changes. An additional 0.1 μF capacitor in parallel also helps reduce noise from the supply.
OUTPUT CAPACITOR
The ADR36x does not require output capacitors for stability under any load condition. An output capacitor, typically 0.1 μF, filters out any low level noise voltage and does not affect the operation of the part. On the other hand, the load transient response can improve with an additional 1 μF to 10 μF output capacitor in parallel. A capacitor here acts as a source of stored energy for a sudden increase in load current. The only
parameter that degrades by adding an output capacitor is the turn-on time. The degradation depends on the size of the capacitor chosen.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 17 of 20
APPLICATIONS
BASIC VOLTAGE REFERENCE CONNECTION
The circuit in Figure 33 illustrates the basic configuration for the ADR36x family. Decoupling capacitors are not required for circuit stability. The ADR36x family is capable of driving
capacitive loads from 0 μF to 10 μF. However, a 0.1 μF ceramic output capacitor is recommended to absorb and deliver the charge as is required by a dynamic load.
F
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Figure 33. Basic Configuration for the ADR36x Family
Stacking Reference ICs for Arbitrary Outputs
Some applications can require two reference voltage sources, which are a combined sum of standard outputs. Figure 34 shows how this stacked output reference can be implemented.
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Figure 34. Stacking Voltage References with the ADR36x
Two reference ICs are used and fed from an unregulated input, V IN . The outputs of the individual ICs are connected in series, which provides two output voltages, V OUT1 and V OUT2. V OUT1 is the terminal voltage of U1, while V OUT2 is the sum of this voltage and the terminal voltage of U2. U1 and U2 are chosen for the two voltages that supply the required outputs (see Table 10). For example, if both U1 and U2 are ADR361s, V OUT1 is 2.5 V and V OUT2 is 5.0 V . Table 10. Output
U1/U2 V OUT1 V OUT2 ADR361/ADR365 2.5 7.5 ADR361/ADR361 2.5 5.0 ADR365/ADR361 5
7.5
A Negative Precision Reference Without Precision Resistors
A negative reference is easily generated by adding an op amp, A1 and is configured in Figure 35. V OUTF and V OUTS are at virtual ground and, therefore, the negative reference can be taken directly from the output of the op amp. The op amp must be dual-supply, low offset, and rail-to-rail if the negative supply voltage is close to the reference output.
Figure 35. Negative Reference
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 18 of 20
General-Purpose Current Source
Many times in low power applications, the need arises for a precision current source that can operate on low supply
voltages. The ADR36x can be configured as a precision current source (see Figure 36). The circuit configuration illustrated is a floating current source with a grounded load. The reference’s output voltage is bootstrapped across R SET , which sets the output current into the load. With this configuration, circuit precision is maintained for load currents ranging from the reference’s supply current, typically 150 μA, to approximately 5 mA.
+ I SY
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Figure 36. Precision Current Source
Trim Terminal
The ADR36x trim terminal can be used to adjust the output voltage over a nominal voltage. This feature allows a system
designer to trim system errors by setting the reference to a voltage other than the standard voltage option. Resistor R1 is used for fine adjustment and can be omitted if desired. The resistor values should be carefully chosen to ensure that the maximum current drive of the part is not exceeded.
Figure 37. ADR36x Trim Configuration
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. 0 | Page 19 of 20
OUTLINE DIMENSIONS
*COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS.
0.500.30PLANE
Figure 38. 5-Lead Thin Small Outline Transistor Package [TSOT]
(UJ-5)
Dimensions shown in millimeters
ORDERING GUIDE
Output Voltage Initial Accuracy Temperature
Coefficient
Models 1(V O ) (mV) (%) (ppm/°C) Package
Description Package Option Temperature Range
Branding ADR360AUJZ-REEL72 2.048 6 0.29 25
5-Lead TSOT UJ-5 –40°C to +125°C R0C ADR360BUJZ-REEL72
2.048 3 0.15 9 5-Lead TSOT UJ-5 –40°C to +125°C R0D ADR361AUJZ-REEL72 2.5 6 0.24 25
5-Lead TSOT UJ-5 –40°C to +125°C R0E ADR361BUJZ-REEL72
2.5 3 0.12 9 5-Lead TSOT UJ-5 –40°C to +125°C R0F ADR363AUJZ-REEL72
3.0 6 0.2 25
5-Lead TSOT UJ-5 –40°C to +125°C R0G ADR363BUJZ-REEL72
3.0 3 0.1 9
5-Lead TSOT UJ-5 –40°C to +125°C R0H ADR364AUJZ-REEL72
4.096 8 0.2 25 5-Lead TSOT UJ-5 –40°C to +125°C R0J ADR364BUJZ-REEL72 4.096 4 0.1 9
5-Lead TSOT UJ-5 –40°C to +125°C R0K ADR365AUJZ-REEL72
5.0 8 0.16 25 5-Lead TSOT UJ-5 –40°C to +125°C R0L ADR365BUJZ-REEL72 5.0 4 0.08 9
5-Lead TSOT UJ-5 –40°C to +125°C R0M ADR366AUJZ-REEL72
3.3 8 0.25 25 5-Lead TSOT UJ-5 –40°C to +125°C R08 ADR366BUJZ-REEL72 3.3 4 0.125 9
5-Lead TSOT
UJ-5
–40°C to +125°C
R09
1 3,000 pieces per reel. 2
Z = Pb-free part.
ADR360/ADR361/ADR363/ADR364/ADR365/ADR366
Rev. A | Page 20 of 20
NOTES
?2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
D05467-3/06(A)