+30 V/15 V Operation 128-Position Digital Potentiometer AD7376 FEATURES FUNCTIONAL BLOCK DIAGRAM 128 positions AD7376 V DD 10 k, 50 k, 100 k SDO Q A 20 V to 30 V single-supply operation 7-BIT 7 7 7-BIT 10 V to 15 V dual-supply operation SERIAL LATCH REGISTER 3-wire SPI-compatible serial interface W THD 0.006% typical SDI D Programmable preset CK B SHDN Power shutdown: less than 1 A R iCMOS process technology CLK CS V SS APPLICATIONS High voltage DAC GND RS SHDN Programmable power supply Figure 1. Programmable gain and offset adjustment Programmable filters, delays Actuator control Audio volume control Mechanical potentiometer replacement GENERAL DESCRIPTION 1 The AD7376 is one of the few high voltage, high performance The AD7376 features sleep-mode programmability in shutdown 2 digital potentiometers on the market. This device can be used that can be used to program the preset before device activation, as a programmable resistor or resistor divider. The AD7376 thus providing an alternative to costly EEPROM solutions. performs the same electronic adjustment function as mechanical The AD7376 is available in 14-lead TSSOP and 16-lead wide potentiometers, variable resistors, and trimmers with enhanced body SOIC packages in 10 k, 50 k, and 100 k options. All resolution, solid-state reliability, and programmability. With parts are guaranteed to operate over the 40C to +85C digital rather than manual control, the AD7376 provides layout extended industrial temperature range. flexibility and allows closed-loop dynamic controllability. 1 Patent number: 54952455. 2 The terms digital potentiometer and RDAC are used interchangeably. Rev. D 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 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 19972011 Analog Devices, Inc. All rights reserved. 01119-001AD7376 TABLE OF CONTENTS Features .............................................................................................. 1 Programming the Variable Resistor ......................................... 12 Applications ....................................................................................... 1 Programming the Potentiometer Divider ............................... 13 Functional Block Diagram .............................................................. 1 3-Wire Serial Bus Digital Interface .......................................... 13 General Description ......................................................................... 1 Daisy-Chain Operation ............................................................. 14 Revision History ............................................................................... 2 ESD Protection ........................................................................... 14 Specifications ..................................................................................... 3 Terminal Voltage Operating Range ......................................... 14 Electrical Characteristics10 k Version ................................ 3 Power-Up and Power-Down Sequences .................................. 14 Electrical Characteristics50 k, 100 k Versions ............... 4 Layout and Power Supply Biasing ............................................ 15 Timing Specifications .................................................................. 5 Applications Information .............................................................. 16 3-Wire Digital Interface ................................................................... 6 High Voltage DAC ...................................................................... 16 Absolute Maximum Ratings ............................................................ 7 Programmable Power Supply ................................................... 16 ESD Caution .................................................................................. 7 Audio Volume Control .............................................................. 17 Pin Configurations and Function Descriptions ........................... 8 Outline Dimensions ....................................................................... 18 Typical Performance Characteristics ............................................. 9 Ordering Guide .......................................................................... 19 Theory of Operation ...................................................................... 12 11/05Rev. 0 to Rev. A REVISION HISTORY Updated Format .................................................................. Universal 8/11Rev. C to Rev. D Deleted DIP Package .......................................................... Universal Changes to Output Logic Low Conditions, Table 1 ..................... 3 Changes to Features ..........................................................................1 Changes to Output Logic Low Conditions, Table 2 ..................... 5 Separated Electrical Characteristics into Table 1 and Table 2 .....3 Changes to Figure 28 ...................................................................... 14 Separated Interface Timing into Table 3 ........................................5 Updates Outline Dimensions ........................................................ 18 Changes to Table 1 Through Table 3...............................................3 7/09Rev. B to Rev. C Added Table 4 ....................................................................................6 Changes to Features Section............................................................ 1 Added Figure 2...................................................................................6 Updates Outline Dimensions ........................................................ 19 Changes to Absolute Maximum Ratings Section ..........................7 Changes to Ordering Guide .......................................................... 20 Deleted Parametric Test Circuits Section .......................................7 Changes to Typical Performance Characteristics..........................9 3/07Rev. A to Rev. B Added Daisy-Chain Operation Section ...................................... 14 Updated Format .................................................................. Universal Added ESD Protection Section ..................................................... 14 Changes to Absolute Maximum Ratings ....................................... 7 Added Terminal Voltage Operating Range Section ................... 14 Changes to ESD Protection Section ............................................. 14 Changes to Ordering Guide .......................................................... 19 Added Power-Up and Power-Down Sequences Section ........... 14 Added Layout and Power Supply Biasing Section ..................... 15 Added Applications Section .......................................................... 16 Updated Outline Dimensions ....................................................... 18 Changes to Ordering Guide .......................................................... 19 10/97Revision 0: Initial Version Rev. D Page 2 of 20