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AD5231BRU10 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD5231BRU10 Arkusz danych(HTML) 1 Page - Analog Devices |
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1 / 24 page  REV. 0 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 rights of third parties that may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a AD5231* One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 Nonvolatile Memory, 1024-Position Digital Potentiometers FUNCTIONAL BLOCK DIAGRAM RDAC REGISTER EEMEM1 DIGITAL REGISTER EEMEM CONTROL 28 BYTES USER EEMEM EEMEM2 AD5231 RDAC DIGITAL OUTPUT BUFFER CS CLK WP PR SDI GND SDO RDY SDO SERIAL INTERFACE ADDR DECODE VDD VSS A W B O1 O2 SDI 2 CODE – Decimal 100 75 0 0 1023 256 512 768 50 25 RWB RWA Figure 1. RWA(D) and RWB(D) vs. Decimal Code FEATURES Nonvolatile Memory1 Preset Maintains Wiper Settings 1024-Position Resolution Full Monotonic Operation 10 k , 50 k , and 100 k Terminal Resistance Permanent Memory Write-Protection Wiper Settings Read Back Linear Increment/Decrement Log Taper Increment/Decrement Push Button Increment/Decrement Compatible SPI Compatible Serial Interface with Readback Function 3 V to 5 V Single Supply or 2.5 V Dual Supply 28 Bytes User Nonvolatile Memory for Constant Storage 100 Year Typical Data Retention TA = 55 C APPLICATIONS Mechanical Potentiometer Replacement Instrumentation: Gain, Offset Adjustment Programmable Voltage to Current Conversion Programmable Filters, Delays, Time Constants Line Impedance Matching Power Supply Adjustment Low Resolution DAC Replacement GENERAL DESCRIPTION The AD5231 provides nonvolatile memory digitally controlled potentiometers 2 with 1024-position resolution. These devices perform the same electronic adjustment function as a mechanical potentiometer. The AD5231’s versatile programming via a stan- dard 3-wire serial interface allows 16 modes of operation and adjustment, including scratch pad programming, memory stor- ing and retrieving, increment/decrement, log taper adjustment, wiper setting read back, and extra user-defined EEMEM. In the scratch pad programming mode, a specific setting can be programmed directly to the RDAC 2 register, which sets the resis- tance at terminals W-A and W-B. The RDAC register can also be loaded with a value previously stored in the EEMEM 1 regis- ter. The value in the EEMEM can be changed or protected. When changes are made to the RDAC register, the value of the new setting can be saved into the EEMEM. Thereafter, such value will be transferred automatically to the RDAC register during system power ON. It is enabled by the internal preset strobe. EEMEM can also be retrieved through direct programming and external preset pin control. Other operations include linear step increment and decrement commands such that the setting in the RDAC register can be moved UP or DOWN, one step at a time. For logarithmic changes in wiper setting, a left/right bit shift command adjusts the level in ±6 dB steps. The AD5231 is available in thin TSSOP-16 package. All parts are guaranteed to operate over the extended industrial tempera- ture range of –40 °C to +85°C. NOTES 1The terms Nonvolatile Memory and EEMEM are used interchangeably. 2The terms Digital Potentiometer and RDAC are used interchangeably. *Patent pending |
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