Precision Low Power 2.048 V
SOT-23 Voltage Reference
ADR370
FEATURES
Initial accuracy: ±4 mV maximum
Initial accuracy error: ±0.2%
Low TCVO
±50 ppm/°C maximum from −40°C to +125°C
30 ppm/°C maximum from +25°C to +70°C
Load regulation: 400 μV/mA, 100 ppm/mA
Line regulation: 25 μV/V, 20 ppm/V
Wide operating range: V
IN
= 2.3 V to 15 V
Low power: 72 μA maximum
High output sink/source current: ±5 mA minimum
Wide temperature range: −40°C to +125°C
Tiny 3-lead SOT-23 package with standard pin configuration
PIN CONFIGURATION
V
IN
1
03432-001
ADR370
V
OUT
2
3
GND
Figure 1. 3-Lead SOT-23
Table 1. ADR370 Products
Output
Voltage (V)
2.048
2.048
Initial
Accuracy ±
(mV) (%)
4
0.2
10
0.5
Temperature
Coefficient
APPLICATIONS
Battery-powered instrumentation
Portable medical instruments
Data acquisition systems
Industrial process control systems
Automotive
Products
ADR370BRT-REEL7
ADR370ART-REEL7
(ppm/°C)
50
100
GENERAL DESCRIPTION
The ADR370
1
is a low cost, 3-terminal (series) band gap voltage
reference featuring high accuracy, high stability, and low power
consumption packaged in a tiny 3-lead SOT-23 package. Precise
matching and thermal tracking of on-chip components, as well
as patented temperature drift curvature correction design
techniques, have been employed to ensure that the ADR370
provides an accurate 2.048 V output.
This micropowered, low dropout voltage device sources or sinks
up to 5 mA of load current while providing a stable 2.048 V
output. The compact footprint, high accuracy, and operating
range of 2.3 V to 15 V make the ADR370 ideal for use in 3 V
and 5 V systems where there can be wide variations in supply
voltage and a need to minimize power dissipation.
The ADR370 is offered in A and B grades; all devices are
specified over the extended industrial range of −40°C to +125°C.
1
Protected by U.S. Patent No. 5,969,657; other patents pending.
Rev. C
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.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2003–2007 Analog Devices, Inc. All rights reserved.
ADR370
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications ....................................................................................... 1
Pin Configuration ............................................................................. 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Electrical Characteristics ............................................................. 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution .................................................................................. 4
Typical Performance Characteristics ............................................. 5
Terminology ...................................................................................... 7
Theory of Operation .........................................................................8
Applying the ADR370...................................................................8
Applications Information .................................................................9
Low Cost Negative Reference ......................................................9
Precision Negative Reference .......................................................9
Low Cost Current Source .............................................................9
Precision Current Source with Adjustable Output ...................9
12-Bit Precision Programmable Current Source ................... 10
Precision Boosted Output Regulator ....................................... 10
Outline Dimensions ....................................................................... 11
Ordering Guide .......................................................................... 11
REVISION HISTORY
12/07—Rev. B to Rev. C
Changes to Line Regulation Specification..................................... 3
9/07—Rev. A to Rev. B
Updated Format .................................................................. Universal
Changes to Table 2 ............................................................................ 3
Changes to Ordering Guide .......................................................... 11
Updated Outline Dimensions ....................................................... 11
7/03—Rev. 0 to Rev. A
Changes to Features.......................................................................... 1
Changes to Table I ............................................................................ 1
Changes to Electrical Characteristics ............................................ 2
Changes to Absolute Maximum Ratings ....................................... 3
Changes to Ordering Guide ............................................................ 3
Changes to Parameter Definitions ................................................. 6
Updated Outline Dimensions ......................................................... 9
Rev. C | Page 2 of 12
ADR370
SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
T
A
= T
MIN
to T
MAX
, V
IN
= 5 V, unless otherwise noted.
Table 2.
Parameter
OUTPUT VOLTAGE (@ 25°C)
INITIAL ACCURACY ERROR
A Grade
B Grade
OUTPUT VOLTAGE TEMPERATURE DRIFT
1
A Grade
B Grade
SUPPLY HEADROOM
LOAD REGULATION
TCV
O
T
A
= −40°C to +125°C
T
A
= −40°C to +125°C
T
A
= 25°C to 70°C
V
IN
− V
OUT
0 mA < I
OUT
< 5 mA @ 25°C
−3 mA < I
OUT
< 0 mA @ 25°C
−0.1 mA < I
OUT
< +0.1 mA
V
OUT
+ 200 mV < V
IN
< 15 V
I
OUT
= 0 mA
V
IN
= 5 V ± 100 mV (f = 120 Hz)
200
+0.400
+0.600
+4.75
20
80
72
15
0.1 Hz to 10 Hz
10 Hz to 10 kHz
C
L
= 0.2 μF
1000 hours @ 25°C
115
−40
+125
70
50
100
100
100
50
30
ppm/°C
ppm/°C
ppm/°C
mV
mV/mA
mV/mA
mV/mA
ppm/V
dB
μA
mA
μV p-p
μV rms
μs
ppm/1000 hrs
ppm
°C
Symbol
V
O
V
OERR
Conditions
Min
2.044
−10
−0.5
−4
−0.2
Typ
2.048
Max
2.052
+10
+0.5
+4
+0.2
Unit
V
mV
%
mV
%
LINE REGULATION
RIPPLE REJECTION
QUIESCENT CURRENT
SHORT-CIRCUIT CURRENT TO GROUND
NOISE VOLTAGE (@ 25°C)
TURN-ON SETTLING TIME
LONG-TERM STABILITY
OUTPUT VOLTAGE HYSTERESIS
TEMPERATURE RANGE
1
ΔV
OUT
/ΔV
IN
Guaranteed by characterization.
Rev. C | Page 3 of 12
ADR370
ABSOLUTE MAXIMUM RATINGS
Ratings at 25°C, unless otherwise noted.
Table 3.
Parameter
Supply Voltage
Storage Temperature Range
Operating Temperature Range
Lead Temperature
Soldering, 60 sec
Infrared, 15 sec
Rating
18 V
−65°C to +125°C
−40°C to +125°C
215°C
220°C
THERMAL RESISTANCE
θ
JA
is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 4.
Package Type
3-Lead SOT-23 (RT)
θ
JA
220
θ
JC
102
Unit
°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 4 of 12
ADR370
TYPICAL PERFORMANCE CHARACTERISTICS
12
10
6
V
IN
= 5V TO 15V
4
LINE REGULATION (ppm/V)
03432-002
8
6
ΔV
O
(mV)
2
0
–2
–4
–6
03432-005
–40°C
4
+125°C
2
0
–2
–4
–4
+25°C
–8
–10
–40
–3
–2
–1
0
1
2
3
4
5
45
TEMPERATURE (°C)
125
LOAD (mA)
Figure 2. Load Regulation vs. Load Current
2.048
Figure 5. Line Regulation vs. Temperature
2.046
V
IN
= 5V
OUTPUT VOLTAGE (V)
2.044
2.042
V
IN
= 15V
2.040
2.036
–40
45
TEMPERATURE (°C)
125
03432-003
TIME (0.1s/DIV)
Figure 3. Output Voltage vs. Temperature
80
Figure 6. Voltage Noise 0.1 Hz to 10 Hz
70
SUPPLY CURRENT (µA)
60
V
IN
= 5V
50
40
20
–40
45
TEMPERATURE (°C)
125
03432-004
TIME (0.1s/DIV)
Figure 4. Supply Current vs. Temperature
Figure 7. Voltage Noise 10 Hz to 100 kHz
Rev. C | Page 5 of 12
03432-007
30
VOLTAGE (200µV/DIV)
V
IN
= 15V
03432-006
2.038
VOLTAGE (10µV/DIV)
嵌入式系统
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