2 256-Position SPI/I C Selectable Digital Potentiometer Data Sheet AD5161 FEATURES FUNCTIONAL BLOCK DIAGRAM V SDO/NC DD 256-position End-to-end resistance 5 k, 10 k, 50 k, 100 k SDI/SDA A Compact MSOP-10 (3 mm 4.9 mm) package CLK/SCL 2 SPI OR I C 2 Pin selectable SPI/I C compatible interface INTERFACE DIS Extra package address decode pin AD0 W CS/AD0 Full read/write of wiper register Power-on preset to midscale WIPER B REGISTER Single supply 2.7 V to 5.5 V Low temperature coefficient 45 ppm/C Low power, I = 8 A DD GND Wide operating temperature 40C to +125C Figure 1. SDO output allows multiple device daisy-chaining Evaluation board available APPLICATIONS PIN CONFIGURATION Mechanical potentiometer replacement in new designs A 1 10 W Transducer adjustment of pressure, temperature, position, 2 9 B AD5161 V DD CS/ADO 3 8 DIS chemical, and optical sensors TOP VIEW (Not to Scale) 4 7 SDO/NC GND RF amplifier biasing 5 6 SDI/SDA CLK/SCL Gain control and offset adjustment Figure 2. GENERAL DESCRIPTION The AD5161 provides a compact 3 mm 4.9 mm packaged solution for 256-position adjustment applications. These devices perform the same electronic adjustment function as mechanical potentiometers or variable resistors, with enhanced resolution, solid-state reliability, and superior low temperature coefficient performance. The wiper settings are controllable through a pin selectable SPI 2 or I C compatible digital interface, which can also be used to read back the wiper register content. When the SPI mode is used, the device can be daisy-chained (SDO to SDI), allowing 2 several parts to share the same control lines. In the I C mode, address pin AD0 can be used to place up to two devices on the same bus. In this same mode, command bits are available to reset the wiper position to midscale or to shut down the device into a state of zero power consumption. Operating from a 2.7 V to 5.5 V power supply and consuming less than 5 A allows for usage in portable battery-operated applications. Rev. C Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20032015 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. AD5161 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 SPI Interface .................................................................................... 13 2 Applications ....................................................................................... 1 I C Interface .................................................................................... 14 General Description ......................................................................... 1 Theory of Operation ...................................................................... 15 Functional Block Diagram .............................................................. 1 Programming the Variable Resistor ......................................... 15 Pin Configuration ............................................................................. 1 Programming the Potentiometer Divider ............................... 16 Revision History ............................................................................... 2 Pin Selectable Digital Interface ................................................. 16 Electrical Characteristics5 k Version ........................................ 3 Level Shifting for Bidirectional Interface ................................ 18 Electrical Characteristics10 k, 50 k, 100 k V ersions ......... 4 ESD Protection ........................................................................... 18 Timing Characteristics5 k, 10 k, 50 k, 100 k V ersions .. 5 Terminal Voltage Operating Range ......................................... 18 Absolute Maximum Ratings ............................................................ 6 Power-Up Sequence ................................................................... 18 ESD Caution .................................................................................. 6 Layout and Power Supply Bypassing ....................................... 18 Pin Configuration and Function Descriptions ............................. 7 Outline Dimensions ....................................................................... 19 Typical Performance Characteristics ............................................. 8 Ordering Guide .......................................................................... 19 Test Circuits ..................................................................................... 12 REVISION HISTORY 6/15Rev. B to Rev. C Changes to Ordering Guide .......................................................... 19 8/12Rev. A to Rev. B Changes to Applications Section .................................................... 1 Updated Outline Dimensions ....................................................... 19 4/09Rev. 0 to Rev. A Changes to Ordering Guide .......................................................... 19 5/03Revision 0: Initial Version Rev. C Page 2 of 20