Circuit Note CN-0131 Circuit Designs Using Analog Devices Products Apply these product pairings quickly and with confidence. For more information and/or support call 1-800-AnalogD (1-800-262-5643) or visit www.analog.com/circuit. Devices Connected/Referenced AD5360 16-Channel, 16-Bit Voltage Output DAC ADR431/ ADR421 ADR435 2.5 V Ultralow Noise Voltage Reference 5 V Ultralow Noise Voltage Reference 16 Channels of Programmable Output Span Using the AD5360 16-Bit Voltage Output DAC CIRCUIT FUNCTION AND BENEFITS AD5360 is four times the reference voltage, with the mid-scale point at 0 V. The ADR431 and ADR421 are low noise precision 2.5 V references. The ADR435 is a low noise precision 5 V reference. When connected as shown in Figure 1, the AD5360 will have an output span of ±5 V on VOUT0 to VOUT7 and an output span of ±10 V on VOUT8 to VOUT15. The AD5360 has two offset DAC registers, which allow the mid-scale point of the span to be altered within the limits of part functionality and headroom. This circuit is a multichannel DAC configuration with different output spans on groups of channels. It utilizes the AD5360 to provide 16 DAC channels with 16 bits of resolution. The AD5360 is configured to have eight channels with an output span of ±10 V and eight channels with an output span of ±5 V. CIRCUIT DESCRIPTION The AD5360 is a 16-channel, 16-bit DAC available both in 56-lead LFCSP and 52-lead LQFP packages. The AD5360 has two reference input pins. VREF0 is the reference pin for DAC channels VOUT0 to VOUT7. VREF1 is the reference pin for DAC channels VOUT8 to VOUT15. The circuit must be constructed on a multilayer PC board with a large area ground plane. Proper layout, grounding, and decoupling techniques must be used to achieve optimum performance (see Tutorial MT-031 and Tutorial MT-101). Figure 1 shows a typical configuration for the AD5360 using two external references. The nominal output span for the 15V 5V 0.1µF 10µF ADR431/ ADR421 0.1µF 2.5V VDD DVCC VREF0 VOUT0 0.1µF ±5V VOUT7 5V AD5360 ADR435 VOUT8 ±10V VREF1 VOUT15 0.1µF VSS SIGGND AGND DGND 0.1µF –15V 08609-001 10µF Figure 1. 16 Channels of Programmable Output Voltage Span Using the AD5360 DAC (Simplified Schematic: Decoupling and All Connections Not Shown) Rev. 0 “Circuits from the Lab” from Analog Devices have been designed and built by Analog Devices engineers. Standard 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 ©2009 Analog Devices, Inc. All rights reserved. CN-0131 Circuit Note COMMON VARIATIONS Data Sheets and Evaluation Boards The AD5362 is an 8-channel version of the AD5360. The AD5361 and AD5363 are 14-bit versions of the AD5360 and AD5362, respectively. AD5360 Data Sheet AD5360 Evaluation Board The circuit described here can be used with any of the AD536x devices mentioned above. The references can also be changed to give different output ranges if required. LEARN MORE Kester, Walt. The Data Conversion Handbook. Chapter 3, 7. Analog Devices. 2005. 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. AD5361 Data Sheet AD5362 Data Sheet AD5363 Data Sheet ADR421 Data Sheet ADR431 Data Sheet ADR435 Data Sheet REVISION HISTORY 10/09—Revision 0: Initial Version MT-101 Tutorial, Decoupling Techniques. Analog Devices. Voltage Reference Wizard Design Tool. Analog Devices. (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. ©2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. CN08609-0-10/09(0) Rev. 0 | Page 2 of 2