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Download CN-0029: 利用AD5390/AD5391/AD5392 DAC实现8-16通道可编程电压 以及出色的温度漂移性能
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Figure 1 shows a typical configuration for the AD5390/ AD5391/AD5392 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 AD5390/AD5391/ AD5392 device. On power-up, the AD5390/AD5391/AD5392 defaults to external reference operation. CIRCUIT FUNCTION AND BENEFITS This circuit is a multichannel DAC configuration with excellent temperature drift performance. It utilizes the AD5390/ AD5391/AD5392 to provide between 8 and 16 DAC channels with 12 to 14 bits of resolution. The ADR421/ADR431 precision voltage reference ensures that the temperature stability of the circuit is typically less than 3 ppm/°C. This design uses two separate 5.0 V power supplies―one to power the voltage reference and the analog portion of the AD5390/AD5391/AD5392 (AVDD) and the other to power the digital portion of the AD5390/AD5391/AD5392 (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 CIRCUIT DESCRIPTION The AD5390/AD5391 are complete single-supply, 16-channel, 14-bit and 12-bit DACs, respectively. The AD5392 is a complete single-supply, 8-channel, 14-bit DAC. Devices are available both in 64-lead LFCSP and 52-lead LQFP packages. All channels have an on-chip output amplifier with rail-to-rail operation. 5.0V 5.0V 0.1µF ADR431/ ADR421 10µF 2.5V 0.1µF AVDD DVDD VOUT 0 REFOUT/REFIN 0.1µF AD539x REF_GND VOUT 15 AGND DGND 08251-001 DAC_GND SIGNAL_GND Figure 1. AD5390/AD5391/AD5392 Typical Configuration with External Reference (Simplified Schematic) www.BDTIC.com/ADI minimize switching noise at the DVDD supply pins. Additional decoupling using a series connected ferrite bead may be required. The AD5390/AD5391/AD5392 digital (DVDD) power supply can operate off 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 regular. Refer to the ADIsimPower™ tool for guidance on the power supply designs. It is recommended to decouple each power pin close to the device with a 0.1 µF ceramic and 10 µF tantalum capacitor. In this application, the reference for the AD5390/AD5391/AD5392 is provided externally from either an ADR421 or ADR431 2.5 V reference. The ADR431 provides a lower output voltage noise specification for applications where this 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 AD5390/AD5391/AD5392 with the ADR280 1.2 V reference where all other connections and components are the same as those outlined above. LEARN MORE ADIsimPower Design Tool. Kester, Walt. 2005. The Data Conversion Handbook. Analog Devices. See chapters 3 and 7. MT-015 Tutorial, 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 Data Sheets and Evaluation Boards AD5390 Data Sheet. AD5391 Data Sheet. AD5392 Data Sheet. ADR421 Data Sheet. ADR431 Data Sheet. AD5390/AD5391/AD5392 Evaluation Board. REVISION HISTORY 6/09—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 warranty 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. CN08251-0-6/09(A) www.BDTIC.com/ADI