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CN0011
ADI 资料
Circuit Note
32 Channels of Programmable Voltage with Excellent Temperature Drift
Performance Using the AD5382 DAC
CIRCUIT FUNCTION AND BENEFITS
This circuit is a multichannel DAC configuration with excellent temperature drift
performance. It provides 32 individual voltage channels with 14 bits of resolution
and a temperature stability of typically less than 3 ppm/°C.
CIRCUIT DESCRIPTION
Figure 1 shows a typical configuration for the AD5382 when configured for use with
an external reference. In the circuit shown, all AGND, SIGNAL_GND, and DAC_GND pins
are tied together to a common AGND. AGND and DGND are connected together at the AD5382
device. On power-up, the AD5382 defaults to external reference operation.
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This design uses two separate 5.0 V power supplies—one to power the voltage reference
and the analog portion of the
AD5382
(AVDD),
the
other
to
power
the
digital
portion
ofhttp://www.1mpi.com/doc/ab047c3e5053d1c0d2728c2c the AD5382 (DVDD). For best
performance, a linear regulator
should always be used to power the analog portion of the circuit. If a switching
regulator is used to power the digital portion, care should be taken to minimize
switching noise at the DVDD supply pins. Additional decoupling using a series
connected ferrite bead may be required. The AD5382 digital (DVDD) power supply can
operate from a 3 V or 5 V supply, which provides for maximum flexibility when
interfacing to digital components. Both supplies can be tied together to a common
5 V supply, provided that supply is derived from a linear
regulator. Refer to the ADIsimPower? design tool for guidance on the power supply
designs.
08203-001
Figure 1. AD5382 Typical Configuration with External Reference (Simplified
Schematic)
Rev. A
“Circuits from the Lab” from Analog Devices have been designed and built by Analog
Deviceshttp://www.1mpi.com/doc/ab047c3e5053d1c0d2728c2c
engineers.
Standard
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engineering practices have been employed in the design and construction of each
circuit, and their function and performance have been tested and verified in a lab
environment at room temperature. However, you are solely responsible for testing the
circuit and determining its suitability and applicability for your use and
application. Accordingly, in no event shall Analog Devices be liable for direct,
indirect, special, incidental, consequential or punitive damages due to any cause
whatsoever connected to the use of any “Circuit from the Lab”. (Continued on last
page)
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 ?2008–2009 Analog Devices, Inc. All rights
reserved.
LEARN MORE
ADIsimPower Design Tool.
Kester, Walt. 2005. The Data Conversion Handbook. Analog Devices. Chapters 3 and 7.
MT-015
http://www.1mpi.com/doc/ab047c3e5053d1c0d2728c2cTutorial,
Basic
DAC
Architectures II: Binary DACs. Analog Devices. MT-031 Tutorial, Grounding Data
Converters and Solving the Mystery of AGND and DGND. Analog Devices. MT-101 Tutorial,
Decoupling Techniques. Analog Devices. Voltage Reference Wizard Design Tool
It is recommended to decouple close to the device with a 0.1 ?F ceramic and a 10 μF
tantalum capacitor. In this circuit, the reference for the AD5382 is provided
externally from either an ADR421 or ADR431 2.5 V reference. The ADR431 provides a
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lower output voltage noise specification for applications where that specification
is important. The reference should be decoupled at the REFOUT/REFIN pin of the device
with a
0.1 μF capacitor.
COMMON VARIATIONS
A variation of this circuit is the AD5382-3 with the ADR280 1.2 V reference where
all other connections and components are the same as those outlined above.
Data
Sheets
and
Evaluation
AD5382http://www.1mpi.com/doc/ab047c3e5053d1c0d2728c2c
Data
Boards
Sheet.
AD5382
Evaluation Board. ADR421 Data Sheet. ADR431 Data Sheet.
REVISION HISTORY
5/09—Rev. 0 to Rev. A
Updated Format ..................................................................
Universal 10/08—Revision 0: Initial Version
(Continued from first page) "Circuits from the Lab" are intended only for use with
Analog Devices products and are the intellectual property of Analog Devices or its
licensors. While you may use the "Circuits from the Lab" in the design of your product,
no other license is granted by implication or otherwise under any patents or other
intellectual property by application or use of the "Circuits from the Lab".
Information furnished by Analog Devices is believed to be accurate and reliable.
However, "Circuits from the Lab" are supplied "as is" and without warranties of any
kind, express, implied, or statutory including, but not limited to, any implied
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warranhttp://www.1mpi.com/doc/ab047c3e5053d1c0d2728c2cty
of
merchantability,
noninfringement or fitness for a particular purpose and no responsibility is assumed
by Analog Devices for their use, nor for any infringements of patents or other rights
of third parties that may result from their use. Analog Devices reserves the right
to change any "Circuits from the Lab" at any time without notice, but is under no
obligation to do so. Trademarks and registered trademarks are the property of their
respective owners. ?2008–2009 Analog Devices, Inc. All rights reserved. Trademarks
and
registered trademarks are the property of their respective owners.
CN08203-0-5/09(A)
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