Nonvolatile Memory, Quad 64-Position Digital Potentiometer AD5233 FEATURES FUNCTIONAL BLOCK DIAGRAM Nonvolatile memory stores wiper setting AD5233 V DD ADDR RDAC1 4-channel independent programmable CS DECODE REGISTER A1 64-position resolution CLK W1 SDI SERIAL SDI Power-on refreshed with EEMEM settings B1 INTERFACE EEMEM1 SDO SDO RDAC1 EEMEM restore time: 140 s typical Full monotonic operation WP EEMEM RDAC2 10 k, 50 k, and 100 k terminal resistance REGISTER CONTROL A2 RDY W2 Permanent memory write protection B2 Wiper setting readback 11 BYTES EEMEM2 USER EEMEM RDAC2 Predefined linear increment/decrement instructions Predefined 6 dB/step log taper increment/decrement RDAC3 DIGITAL O1 REGISTER A3 OUTPUT instructions O2 W3 BUFFER SPI-compatible serial interface with readback function 2 B3 EEMEM3 2.7 V to 5.5 V single supply or 2.5 V dual supply RDAC3 DIGITAL 5 11 bytes extra nonvolatile memory for user-defined data REGISTER RDAC4 100-year typical data retention, T = 55C A A4 REGISTER PR W4 APPLICATIONS B4 EEMEM5 EEMEM4 RDAC4 Mechanical potentiometer replacement GND V SS Instrumentation: gain, offset adjustment Programmable voltage-to-current conversion Figure 1. Programmable filters, delays, time constants Programmable power supply Sensor calibration GENERAL DESCRIPTION 1 The AD5233 is a quad-channel nonvolatile memory, digitally In the scratchpad programming mode, a specific setting can 2 controlled potentiometer with a 64-step resolution. The device be programmed directly to the RDAC register, which sets the performs the same electronic adjustment function as a mechanical resistance between Terminal W to Terminal A and Terminal W potentiometer with enhanced resolution, solid-state reliability, to Terminal B. This setting can be stored into the EEMEM and and remote controllability. The AD5233 has versatile program- is transferred automatically to the RDAC register during system ming using a serial peripheral interface (SPI) for 16 modes of power-on. operation and adjustment, including scratchpad programming, The EEMEM content can be restored dynamically or through memory storing and restoring, increment/decrement, 6 dB/step PR WP external strobing. A function protects EEMEM contents. log taper adjustment, wiper setting readback, and extra EEMEM To simplify the programming, independent or simultaneous for user-defined information such as memory data for other increment or decrement commands can be used to move the components, look-up tables, or system identification RDAC wiper up or down, one step at a time. For logarithmic information. 6 dB step changes in wiper settings, the left or right bit shift command can be used to double or halve the RDAC wiper setting. The AD5233 is available in a thin 24-lead TSSOP package. The part is guaranteed to operate over the extended industrial 1 The terms nonvolatile memory and EEMEM are used interchangeably. 2 temperature range of 40C to +85C. The terms digital potentiometer and RDAC are used interchangeably. Rev. B 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. Fax: 781.461.3113 20022008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. 02794-001AD5233 TABLE OF CONTENTS Features .............................................................................................. 1 RDAC Structure.......................................................................... 20 Applications ....................................................................................... 1 Programming the Variable Resistor ......................................... 20 Functional Block Diagram .............................................................. 1 Programming the Potentiometer Divider ............................... 21 General Description ......................................................................... 1 Programming Examples ............................................................ 21 Revision History ............................................................................... 2 Flash/EEMEM Reliability .......................................................... 22 Specif icat ions ..................................................................................... 3 Applications Information .............................................................. 23 Electrical Characteristics10 k, 50 k, and 100 k Bipolar Operation from Dual Supplies.................................... 23 Versions .......................................................................................... 3 Gain Control Compensation .................................................... 23 Timing Characteristics ................................................................ 5 High Voltage Operation ............................................................ 23 Absolute Maximum Ratings ............................................................ 7 DAC .............................................................................................. 23 ESD Caution .................................................................................. 7 Bipolar Programmable Gain Amplifier ................................... 24 Pin Configuration and Function Descriptions ............................. 8 Programmable Low-Pass Filter ................................................ 24 Typical Performance Characteristics ............................................. 9 Programmable State-Variable Filter ......................................... 25 Test Circuits ..................................................................................... 13 Programmable Oscillator .......................................................... 26 Theory of Operation ...................................................................... 15 Programmable Voltage Source with Boosted Output ........... 26 Scratchpad and EEMEM Programming .................................. 15 Programmable Current Source ................................................ 27 Basic Operation .......................................................................... 15 Programmable Bidirectional Current Source ......................... 27 EEMEM Protection .................................................................... 16 Resistance Scaling ...................................................................... 27 Digital Input/Output Configuration ........................................ 16 Doubling the Resolution ........................................................... 28 Serial Data Interface ................................................................... 16 Resistance Tolerance, Drift, and Temperature Mismatch Daisy-Chain Operation ............................................................. 17 Considerations ............................................................................ 28 Terminal Voltage Operation Range ......................................... 17 RDAC Circuit Simulation Model ............................................. 28 Power-Up Sequence ................................................................... 17 Outline Dimensions ....................................................................... 29 Latched Digital Outputs ............................................................ 17 Ordering Guide .......................................................................... 29 Advanced Control Modes ......................................................... 19 7/04Rev. 0 to Rev. A REVISION HISTORY Format updated .................................................................. Universal 5/08Rev. A to Rev. B Changes to Features, General Description, and Block Changes to Features ........................................................................... 1 Diagram .............................................................................................. 1 Changes to Table 1 ............................................................................. 3 Changes to Specifications ................................................................. 3 Changes Figure 3 ............................................................................... 6 Replaced Timing Diagrams .............................................................. 6 Changes to Absolute Maximum Ratings Section .......................... 7 Changes to Absolute Maximum Ratings ........................................ 7 Changes to Figure 17 and Figure 18 .............................................. 11 Changes to Pin Function Descriptions ........................................... 8 Changes to Programmable Oscillator Section ............................. 26 Replaced Figure 11 ............................................................................ 9 Changes to Ordering Guide ........................................................... 29 Added Test Circuit (Figure 36) ...................................................... 13 Changes to Theory of Operation ................................................... 14 Changes to Applications ................................................................. 22 Updated Outline Dimensions ........................................................ 28 Changes to Ordering Guide ........................................................... 28 3/02Revision 0: Initial Version Rev. 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