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ADR540 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADR540
Beschreibung High Precision Shunt Mode Voltage References
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 16 Seiten
ADR540 Datasheet, Funktion
High Precision Shunt Mode
Voltage References
ADR520/ADR525/ADR530/ADR540/ADR550
FEATURES
Ultracompact SC70 and SOT-23-3 packages
Temperature coefficient: 40 ppm/°C (maximum)
2× the temperature coefficient improvement over the
LM4040
Pin compatible with the LM4040/LM4050
Initial accuracy: ±0.2%
Low output voltage noise: 14 μV p-p @ 2.5 V output
No external capacitor required
Operating current range: 50 μA to 15 mA
Industrial temperature range: −40°C to +85°C
APPLICATIONS
Portable, battery-powered equipment
Automotive
Power supplies
Data acquisition systems
Instrumentation and process control
Energy measurement
Table 1. Selection Guide
Part
ADR520A
ADR520B
ADR525A
ADR525B
ADR530A
ADR530B
ADR540A
ADR540B
ADR550A
ADR550B
Voltage (V)
2.048
2.048
2.5
2.5
3.0
3.0
4.096
4.096
5.0
5.0
Initial
Accuracy (%)
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
±0.4
±0.2
Temperature
Coefficient
(ppm/°C)
70
40
70
40
70
40
70
40
70
40
PIN CONFIGURATION
V+ 1
V– 2
ADR520/
ADR525/
ADR530/
3 TRIM
ADR540/
ADR550
Figure 1. 3-Lead SC70 (KS) and 3-Lead SOT-23-3 (RT)
GENERAL DESCRIPTION
Designed for space-critical applications, the ADR520/ADR525/
ADR530/ADR540/ADR550 are high precision shunt voltage
references, housed in ultrasmall SC70 and SOT-23-3 packages.
These references feature low temperature drift of 40 ppm/°C,
an initial accuracy of better than ±0.2%, and ultralow output
noise of 14 μV p-p.
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 ADR520/ADR525/
ADR530/ADR540/ADR550 eliminates the need for compensa-
tion by an external capacitor, yet the references are stable with
any capacitive load. The minimum operating current increases
from a mere 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.
A trim terminal is available on the ADR520/ADR525/ADR530/
ADR540/ADR550 to allow adjustment of the output voltage
over a ±0.5% range, without affecting the temperature coefficient
of the device. This feature provides users with the flexibility to
trim out any system errors.
Rev. E
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 ©2003–2008 Analog Devices, Inc. All rights reserved.






ADR540 Datasheet, Funktion
ADR520/ADR525/ADR530/ADR540/ADR550
ABSOLUTE MAXIMUM RATINGS
Ratings apply at 25°C, unless otherwise noted.
Table 7.
Parameter
Reverse Current
Forward Current
Storage Temperature Range
Industrial Temperature Range
Junction Temperature Range
Lead Temperature (Soldering, 60 sec)
Rating
25 mA
20 mA
−65°C to +150°C
−40°C to +85°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
Table 8.
Package Type
3-Lead SC70 (KS)
θJA1
580.5
θJC
177.4
Unit
°C/W
3-Lead SOT-23-3 (RT)
270 102 °C/W
1 θJA is specified for worst-case conditions, such as for devices soldered on
circuit boards for surface-mount packages.
ESD CAUTION
Rev. E | Page 6 of 16

6 Page









ADR540 pdf, datenblatt
ADR520/ADR525/ADR530/ADR540/ADR550
Stacking the ADR520/ADR525/ADR530/ADR540/ADR550
for User-Definable Outputs
Multiple ADR520/ADR525/ADR530/ADR540/ADR550 parts
can be stacked to allow the user to obtain a desired higher voltage.
Figure 22 shows three ADR550s configured to give 15 V. The bias
resistor, RBIAS, is chosen using Equation 3; note that the same
bias current flows through all the shunt references in series.
Figure 23 shows three ADR550s stacked to give −15 V. RBIAS
is calculated in the same manner as before. Parts of different
voltages can also be added together. For example, an ADR525
and an ADR550 can be added together to give an output of
+7.5 V or −7.5 V, as desired. Note, however, that the initial
accuracy error is now the sum of the errors of all the stacked
parts, as are the temperature coefficients and output voltage
change vs. input current.
+VDD
R
+15V
ADR550
ADR550
ADR550
GND
Figure 22. +15 V Output with Stacked ADR550s
GND
R
ADR550
ADR550
ADR550
–15V
–VDD
Figure 23. −15 V Output with Stacked ADR550s
Adjustable Precision Voltage Source
The ADR520/ADR525/ADR530/ADR540/ADR550, combined
with a precision low input bias op amp, such as the AD8610,
can be used to output a precise adjustable voltage. Figure 24
illustrates the implementation of this application using the
ADR520/ADR525/ADR530/ADR540/ADR550. 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 = VREF (1 + R2/R1)
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.
VS
R
VREF
ADR5xx
AD8610
R2
VOUT = VREF (1+R2/R1)
R1
GND
C1
(OPTIONAL)
Figure 24. Adjustable Voltage Source
Rev. E | Page 12 of 16

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