256-Position SPI-Compatible Digital Potentiometer Data Sheet AD5160 FEATURES FUNCTIONAL BLOCK DIAGRAM V DD 256-position End-to-end resistance: 5 k, 10 k, 50 k, 100 k A Compact SOT-23-8 (2.9 mm 3 mm) package CS SPI INTERFACE SPI-compatible interface SDI Power-on preset to midscale W CLK Single supply: 2.7 V to 5.5 V Low temperature coefficient: 45 ppm/C WIPER B REGISTER Low power, I = 8 A DD Wide operating temperature: 40C to +125C Evaluation board available GND Figure 1. APPLICATIONS Mechanical potentiometer replacement in new designs PIN CONFIGURATION Transducer adjustment of pressure, temperature, position, 1 W 8 A chemical, and optical sensors V 2 AD5160 7 B DD RF amplifier biasing 3 6 GND CS TOP VIEW Gain control and offset adjustment (Not to Scale) CLK 4 5 SDI Figure 2. GENERAL DESCRIPTION The AD5160 provides a compact 2.9 mm 3 mm packaged The wiper settings are controllable through an SPI-compatible solution for 256-position adjustment applications. These digital interface. The resistance between the wiper and either devices perform the same electronic adjustment function as end point of the fixed resistor varies linearly with respect to the 1 mechanical potentiometers or variable resistors but with digital code transferred into the RDAC latch. enhanced resolution, solid-state reliability, and superior low Operating from a 2.7 V to 5.5 V power supply and consuming temperature coefficient performance. less than 5 A allows for usage in portable battery-operated applications. 1 The terms digital potentiometer, VR, and RDAC are used interchangeably. 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. 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AD5160 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................8 Applications ....................................................................................... 1 Test Circuits ..................................................................................... 12 Functional Block Diagram .............................................................. 1 SPI Interface .................................................................................... 13 Pin Configuration ............................................................................. 1 Theory of Operation ...................................................................... 14 General Description ......................................................................... 1 Programming the Variable Resistor ......................................... 14 Revision History ............................................................................... 2 Programming the Potentiometer Divider ............................... 15 Specifications ..................................................................................... 3 SPI-Compatible 3-Wire Serial Bus ........................................... 15 Electrical Characteristics5 k Version .................................. 3 ESD Protection ........................................................................... 15 10 k, 50 k, 100 k Versions .................................................. 4 Power-Up Sequence ................................................................... 15 Timing CharacteristicsAll Versions ....................................... 5 Layout and Power Supply Bypassing ....................................... 15 Absolute Maximum Ratings ............................................................ 6 Outline Dimensions ....................................................................... 16 ESD Caution .................................................................................. 6 Ordering Guide .......................................................................... 16 Pin Configuration and Function Descriptions ............................. 7 REVISION HISTORY 11/14Rev. B to Rev. C Changes to Ordering Guide .......................................................... 16 5/09Rev. A to Rev. B Changes to Ordering Guide .......................................................... 16 1/09Rev. 0 to Rev. A Deleted Shutdown Supply Current Parameter and Endnote 7, Table 1 ............................................................................ 3 Changes to Resistor Noise Voltage Density Parameter, Table 1 ................................................................................................ 3 Deleted Shutdown Supply Current Parameter and Endnote 7, Table 2 ............................................................................ 4 Changes to Resistor Noise Voltage Density Parameter, Table 2 ................................................................................................ 4 Added Endnote to Table 3 ............................................................... 5 Changes to Table 4 ............................................................................ 6 Changes to the Rheostat Operation Section ............................... 14 Deleted Terminal Voltage Operating Range Section and Figure 41, Renumbered Figures Sequentially ............................. 13 Changes to Figure 40 and Figure 41 ............................................. 15 Changes to Ordering Guide .......................................................... 16 5/03Revision 0: Initial Version Rev. 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