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ADR5040 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADR5040
Beschreibung Precision Micropower Shunt Mode Voltage References
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADR5040 Datasheet, Funktion
Data Sheet
Precision Micropower Shunt Mode
Voltage References
ADR5040/ADR5041/ADR5043/ADR5044/ADR5045
FEATURES
Ultracompact SC70 and SOT-23 packages
Low temperature coefficient: 75 ppm/°C (maximum)
Pin compatible with LM4040/LM4050
Initial accuracy: ±0.1%
No external capacitor required
Wide operating current range: 50 µA to 15 mA
Extended temperature range: −40°C to +125°C
Qualified for automotive applications
APPLICATIONS
Portable, battery-powered equipment
Automotives
Power supplies
Data acquisition systems
Instrumentation and process control
Energy management
PIN CONFIGURATION
ADR5040/ADR5041/
ADR5043/ADR5044/
ADR5045
V+ 1
V– 2
3 NC
NOTES
1. NC = NO CONNECT.
2. PIN 3 MUST BE LEFT FLOATING OR
CONNECTED TO GROUND.
Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23 (RT)
GENERAL DESCRIPTION
Designed for space-critical applications, the ADR5040/
ADR5041/ADR5043/ADR5044/ADR5045 are high precision
shunt voltage references, housed in ultrasmall SC70 and SOT-23
packages. These voltage references are multipurpose, easy-to-use
references that can be used in a vast array of applications. They
feature low temperature drift, an initial accuracy of better than
0.1%, and fast settling time.
Available in output voltages of 2.048 V, 2.5 V, 3.0 V, 4.096 V, and
5.0 V, the advanced design of the ADR5040/ADR5041/ADR5043/
ADR5044/ADR5045 eliminates the need for compensation by an
external capacitor, yet the references are stable with any capacitive
load. The minimum operating current increases from 50 µA to
a maximum of 15 mA. This low operating current and ease of use
make these references ideally suited for handheld, battery-powered
applications. This family of references has been characterized
over the extended temperature range of −40°C to +125°C. The
ADR5041W and the ADR5044W are qualified for automotive
applications and are available in a 3-lead SOT-23 package.
Table 1. Selection Table
Part
ADR5040A
ADR5040B
ADR5041A
ADR5041B
ADR5043A
ADR5043B
ADR5044A
ADR5044B
ADR5045A
ADR5045B
Voltage (V)
2.048
2.048
2.5
2.5
3.0
3.0
4.096
4.096
5.0
5.0
Initial
Accuracy (%)
±0.2
±0.1
±0.2
±0.1
±0.2
±0.1
±0.2
±0.1
±0.2
±0.1
Temperature
Coefficient
(ppm/°C)
100
75
100
75
100
75
100
75
100
75
Rev. B
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.
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One T echnology Way, P .O. B ox 91 06, N orwood, M A 020 62-9106, U .S.A.
Tel: 781.329.4700
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Fax: 781.461.3113 ©2007–2012 Analog Devices, Inc. All rights reserved.
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ADR5040 Datasheet, Funktion
ADR5040/ADR5041/ADR5043/ADR5044/ADR5045
Data Sheet
ABSOLUTE MAXIMUM RATINGS
Ratings apply at 25°C, unless otherwise noted.
Table 7.
Parameter
Reverse Current
Forward Current
Storage Temperature Range
Extended Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
25 mA
20 mA
–65°C to +150°C
–40°C to +125°C
–65°C to +150°C
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 8. Thermal Resistance
Package Type
θJA
3-Lead SC70 (KS)
580.5
3-Lead SOT-23 (RT)
270
θJC
177.4
102
Unit
°C/W
°C/W
ESD CAUTION
Rev. B | Page 6 of 16

6 Page









ADR5040 pdf, datenblatt
ADR5040/ADR5041/ADR5043/ADR5044/ADR5045
Data Sheet
Adjustable Precision Voltage Source
The ADR5040/ADR5041/ADR5043/ADR5044/ADR5045,
combined with a precision low input bias op amp such as the
AD8610, can be used to output a precise adjustable voltage.
Figure 22 illustrates the implementation of this application
using the ADR5040/ADR5041/ADR5043/ADR5044/ADR5045.
The output of the op amp, VOUT, is determined by the gain of the
circuit, which is completely dependent on the resistors, R1 and R2.
VOUT = (1 + R2/R1)VREF
An additional capacitor, C1, in parallel with R2, can be added to
filter out high frequency noise. The value of C1 is dependent on
the value of R2.
VCC
RBIAS
VREF
ADR5040/ADR5041/
ADR5043/ADR5044/
ADR5045
AD8610
R2
R1
VOUT = VREF (1 + R2/R1)
GND
C1
(OPTIONAL)
Figure 22. Adjustable Voltage Source
Programmable Current Source
By using just a few ultrasmall and inexpensive parts, it is possible
to build a programmable current source, as shown in Figure 23.
The constant voltage on the gate of the transistor sets the current
through the load. Varying the voltage on the gate changes the
current. The AD5247 is a digital potentiometer with I2C® digital
interface, and the AD8601 is a precision rail-to-rail input op
amp. Each incremental step of the digital potentiometer increases
or decreases the voltage at the noninverting input of the op amp.
Therefore, this voltage varies with respect to the reference
voltage.
VDD
RBIAS
RSENSE
ADR5040/
ADR5041/
ADR5043/
ADR5044/
ADR5045
AD5247
V+
AD8601
V–
ILOAD
Figure 23. Programmable Current Source
Rev. B | Page 12 of 16

12 Page





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