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文档下载 免费文档下载 http://www.1mpi.com/ 本文档下载自文档下载网,内容可能不完整,您可以点击以下网址继续阅读或下载: http://www.1mpi.com/doc/ab047c3e5053d1c0d2728c2c 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. 文档下载 免费文档下载 http://www.1mpi.com/ 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 文档下载 免费文档下载 http://www.1mpi.com/ 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 文档下载 免费文档下载 http://www.1mpi.com/ 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 文档下载 免费文档下载 http://www.1mpi.com/ 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. 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