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PDF ADR380 Data sheet ( Hoja de datos )
| Número de pieza | ADR380 | |
| Descripción | SOT-23 Voltage Reference | |
| Fabricantes | Analog Devices | |
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Precision Low Drift 2.048 V/2.500 V
SOT-23 Voltage Reference
ADR380/ADR381
FEATURES
Initial accuracy: ±5 mV/±6 mV maximum
Initial accuracy error: ±0.24%/±0.24%
Low TCVOUT: 25 ppm/°C maximum
Load regulation: 70 ppm/mA
Line regulation: 25 ppm/V
Wide operating ranges
2.4 V to 18 V for ADR380
2.8 V to 18 V for ADR381
Low power: 120 μA maximum
High output current: 5 mA
Wide temperature range: −40°C to +85°C
Tiny 3-lead SOT-23 package with standard pinout
APPLICATIONS
Battery-powered instrumentation
Portable medical instruments
Data acquisition systems
Industrial process control systems
Hard disk drives
Automotive
GENERAL DESCRIPTION
The ADR380 and ADR381 are precision 2.048 V and 2.500 V
band gap voltage references featuring high accuracy, high
stability, and low power consumption in a tiny footprint.
Patented temperature drift curvature correction techniques
minimize nonlinearity of the voltage change with temperature.
The wide operating range and low power consumption make
them ideal for 3 V to 5 V battery-powered applications.
The ADR380 and ADR381 are micropower, low dropout
voltage (LDV) devices that provide a stable output voltage from
supplies as low as 300 mV above the output voltage. They are
specified over the industrial (−40°C to +85°C) temperature
range. The ADR380/ADR381 are available in the tiny 3-lead
SOT-23 package.
PIN CONFIGURATION
VIN 1 ADR380/
ADR381
3 GND
TOP VIEW
VOUT 2 (Not to Scale)
Figure 1. 3-Lead SOT-23
(RT Suffix)
Table 1. ADR38x Products
Part Number
Nominal Output Voltage (V)
ADR380
2.048
ADR381
2.500
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
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 ©2001–2010 Analog Devices, Inc. All rights reserved.
1 page  
ABSOLUTE MAXIMUM RATINGS
Table 6.
Parameter1
Supply Voltage
Output Short-Circuit Duration to GND
VIN > 15 V
VIN ≤ 15 V
Storage Temperature Range
Operating Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 Sec)
Rating
18 V
10 sec
Indefinite
−65°C to +150°C
−40°C to +85°C
−65°C to +150°C
300°C
1 Absolute maximum ratings apply at 25°C, unless otherwise noted.
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.
ADR380/ADR381
THERMAL RESISTANCE
θJA is specified for the worst-case conditions, that is, a device
soldered in a circuit board for surface-mount packages.
Table 7.
Package Type
3-Lead SOT-23 (RT)
θJA Unit
333 °C/W
ESD CAUTION
Rev. C | Page 5 of 16
5 Page 
THEORY OF OPERATION
Band gap references are the high performance solution for low
supply voltage and low power voltage reference applications, and
the ADR380/ADR381 are no exception. However, the uniqueness
of this product lies in its architecture. As shown in Figure 26,
the ideal zero TC band gap voltage is referenced to the output,
not to ground. The band gap cell consists of the PNP pair Q51
and Q52, running at unequal current densities. The difference
in VBE results in a voltage with a positive TC that is amplified
by the ratio of 2 × R58/R54. This PTAT voltage, combined with
the VBE of Q51 and Q52, produce the stable band gap voltage.
Reduction in the band gap curvature is performed by the ratio
of the two resistors, R44 and R59. Precision laser trimming and
other patented circuit techniques are used to further enhance
the drift performance.
VIN
Q1
VOUT
R59 R44
R58
R54 R49
+–
R53 Q52
Q51
R48
R60 R61
GND
Figure 26. Simplified Schematic
ADR380/ADR381
DEVICE POWER DISSIPATION CONSIDERATIONS
The ADR380/ADR381 are capable of delivering load currents to
5 mA with an input voltage that ranges from 2.8 V (ADR381 only)
to 15 V. When this device is used in applications with large input
voltages, take care to avoid exceeding the specified maximum
power dissipation or junction temperature that may result in
premature device failure. Use the following formula to calculate
a device’s maximum junction temperature or dissipation:
PD
=
TJ −TA
θ JA
where:
PD is the device power dissipation,
TJ and TA are junction and ambient temperatures, respectively.
θJA is the device package thermal resistance.
INPUT CAPACITOR
An input capacitor is not required on the ADR380/ADR381.
There is no limit for the value of the capacitor used on the input,
but a capacitor on the input improves transient response in
applications where the load current suddenly increases.
OUTPUT CAPACITOR
The ADR380/ADR381 do not need an output capacitor for
stability under any load condition. Using an output capacitor,
typically 0.1 μF, removes any very low level noise voltage and does
not affect the operation of the part. The only parameter that
degrades by applying an output capacitor is turn-on time. (This
varies depending on the size of the capacitor.) Load transient
response is also improved with an output capacitor, which acts
as a source of stored energy for a sudden increase in load current.
Rev. C | Page 11 of 16
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADR380.PDF ] | |
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