Analog Devices ADR370 a Datasheet
Precision Low Power 2.048 V
SOT-23 Voltage Reference
FEATURES
Initial Accuracy: ⴞ4 mV Max
Initial Accuracy Error: ⴞ0.2%
Low TCVO: ⴞ50 ppm/ⴗC Max from –40ⴗC to +125ⴗC,
30 ppm/ⴗC Max from +25ⴗC to +70ⴗC
Load Regulation: 200 V/mA, 100 ppm/mA
Line Regulation: 25 V/V, 20 ppm/V
Wide Operating Range: V
Low Power: 72 A Max
High Output Sink/Source Current: ⴞ5 mA Min
Wide Temperature Range: –40ⴗC to +125ⴗC
Tiny 3-Lead SOT-23 Package with Standard Pinout
APPLICATIONS
Battery-Powered Instrumentation
Portable Medical Instruments
Data Acquisition Systems
Industrial Process Control Systems
Automotive
GENERAL DESCRIPTION
= 2.3 V to 15 V
IN
The ADR370 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 will source or
sink up to 5 mA of load current while providing a stable 2.048 V
output. The compact footprint, high accuracy, and an operating
range of 2.3 V to 12 V make the ADR370 ideal for use in 3 V
and 5 V systems where there may 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.
ADR370
PIN CONFIGURATION
3-Lead SOT-23
1
V
IN
3
ADR370
V
2
OUT
Table I. ADR370 Products
Output Initial Temperature
Voltage Accuracy Coefficent
Products (VO)
ADR370BRT-REEL7 2.048 4 0.2 50
ADR370ART-REEL7 2.048 10 0.5 100
GND
(mV)
(%) (ppm/°C)
*
*Protected by U.S.Patent No. 5,969,657; other patents pending.
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. 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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc. All rights reserved.
ADR370–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(TA = T
MIN
to T
, VIN = 5 V, unless otherwise noted.)
MAX
Parameter Symbol Conditions Min Typ Max Unit
Output Voltage (@ 25°C) V
O
2.044 2.048 2.052 V
Initial Accuracy Error
A Grade V
B Grade V
V
V
OERR
OERR
OERR
OERR
–10 +10 mV
–0.5 +0.5 %
–4+4mV
–0.2 +0.2 %
Output Voltage Temperature Drift
A Grade TCV
B Grade TCV
TCV
Supply Headroom V
IN
O
O
O
– V
OUT
–40°C to +125°C 100 ppm/°C
–40°C to +125°C50ppm/°C
25°C to 70°C30ppm/°C
200 mV
Load Regulation
Line Regulation V
Ripple Rejection ∆V
/∆VINVIN = 5 V ± 100 mV (f = 120 Hz) 80 dB
OUT
0 mA < I
–3 mA < I
–0.1 mA < I
OUT
= 0 mA
I
OUT
< 5 mA @ 25°C –0.200 +0.200 mV/mA
OUT
< 0 mA @ 25°C –0.480 +0.480 mV/mA
OUT
< +0.1 mA –0.425 +0.425 mV/mA
OUT
200 mV < VIN < 15 V 20 ppm/V
Quiescent Current 72 µA
Short-Circuit Current to Ground 15 µA
Noise Voltage (@ 25°C) 0.1 Hz to 10 Hz 70 µV p-p
10 Hz to 10 kHz 50 µV rms
Turn-On Settling Time C
= 0.2 µF 100 µs
L
Long Term Stability 1,000 Hours @ 25°C 100 ppm/1,000 hrs
Output Voltage Hysteresis 115 ppm
Temperature Range –40 +125 °C
*Guaranteed by characterization.
Specifications subject to change without notice.
–2–
REV. A
ADR370
ABSOLUTE MAXIMUM RATINGS*
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 V
Storage Temperature Range
Package Type
JA
JC
Unit
3-SOT-23 (RT) 220 102 °C/W
RT Package . . . . . . . . . . . . . . . . . . . . . . . . –65°C to +125°C
Operating Temperature Range . . . . . . . . . . .–40°C to +125°C
Lead Temperature Range
Soldering, 60 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215°C
Infrared, 15 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220°C
*Absolute maximum ratings apply at 25°C, unless otherwise noted.
ORDERING GUIDE
Output Initial Temperature Number
Voltage Accuracy Coefficient Package Package of Parts Temperature
Model (VO)(mV) (%) (ppm/°C) Description Option Branding per Reel Range
ADR370BRT-R2 2.048 ±4 0.5 50 SOT-23 3-Lead RPB 250 –40°C to +125°C
ADR370BRT-REEL7 2.048 ±4 0.2 50 SOT-23 3-Lead RPB 3,000 –40°C to +125°C
ADR370ART-R2 2.048 ±10 0.5 100 SOT-23 3-Lead RPA 250 –40°C to +125°C
ADR370ART-REEL7 2.048 ±10 0.5 100 SOT-23 3-Lead RPA 3,000 –40°C to +125°C
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 the
ADR370 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.
REV. A
–3–
ADR370–Typical Performance Characteristics
12
10
8
–40ⴗC
6
4
O – mV
∆ V
+125ⴗC
2
+25ⴗC
0
–2
–4
–4 5–3
–2 –1 01234
LOAD – mA
TPC 1. Load Regulation vs. Load Current
2.048
2.046
2.044
2.042
VIN = 5V
VIN = 15V
6
4
2
0
–2
–4
–6
LINE REGULATION – ppm/V
–8
–10
–40
45 125
TEMPERATURE – ⴗC
V
TPC 4. Line Regulation vs. Temperature
0
0
0
0
0
5V TO 15V
IN
2.040
OUTPUT VOLTAGE – V
2.038
2.036
–40
45 125
TEMPERATURE – ⴗC
TPC 2. Output Voltage vs. Temperature
80
70
60
50
40
SUPPLY CURRENT – A
30
20
–40
TEMPERATURE – ⴗC
= 15V
V
IN
45 125
TPC 3. Supply Current vs. Temperature
0
VOLTA G E – 10V/DIV
0
0
0
000
00000000
TIME – 0.1s/DIV
TPC 5. Voltage Noise 0.1 Hz to 10 Hz
0
0
0
0
V
= 5V
IN
0
0
VOLTA G E – 200V/DIV
0
0
0
000
00000000
TIME – 0.1s/DIV
TPC 6. Voltage Noise 10 Hz to 100 kHz
–4–
REV. A
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