AD5251 I2C, Nonvolatile Memory, Dual 64-Position Digital Potentiometer

The AD5251 is a dual channel, digitally controlled variable resistor (VR) with resolutions of 64 positions. This device performs the same electronic adjustment function as a potentiometer or variable resistor. The AD5251 versatile programming via a Micro Controller allows multiple modes of operation and adjustment.

In the direct program mode a predetermined setting of the RDAC register can be loaded directly from the micro controller. Another key mode of operation allows the RDAC register to be refreshed with the setting previously stored in the EEMEM register. When changes are made to the RDAC register to establish a new wiper position, the value of the setting can be saved into the EEMEM by executing an EEMEM save operation. Once the settings are saved in the EEMEM register, these values will be transferred automatically to the RDAC register to set the wiper position at system power ON. Such operation is enabled by the internal preset strobe and the preset can also be accessed externally.

The basic mode of adjustment is the increment and decrement from the present setting of the Wiper position setting (RDAC) register. An internal scratch pad RDAC register can be moved UP or DOWN, one step of the nominal resistance between terminals A-and-B. This linearly changes the wiper-to-B terminal resistance (RWB) by one out of 64/256 positions of the AD5251/AD5252 end- to-end resistance (RAB). For non-linear changes in wiper setting, a left/right shift command adjusts levels in 6dB steps, which can be useful for sound and light alarm applications.

The AD5251/AD5252 is available in the thin TSSOP-14 package. All parts are guaranteed to operate over the extended industrial temperature range of -40°C to +125°C.

Features and Benefits
  • Nonvolatile Memory Maintains Wiper Settings
  • Resistance Tolerance Stored In Nonvolatile Memory
  • 1 k Ω, 10 k Ω, 50 k Ω 100 k Ω
  • I2C Compatible Serial Interface
  • Wiper Settings Read Back
  • Linear Increment/Decrement Predefined Instructions
  • ±6 dB Log taper Increment/Decrement
    Predefined Instructions
  • Single Supply 2.7 V to 5.5 V
  • Logic Operation Voltage 3 V to 5 V
  • Power On Presets to EEMEM Settings with Refresh Time < 1 ms
  • Nonvolatile Memory Write Protection
  • 100-Year Typical Data Retention
    TA = 55°C
Digital to Analog Converters
Data Sheets
Documentnote
AD5251/AD5252: Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers Data Sheet (Rev. D)PDF 607 kB
Application Notes
Documentnote
AN-1291: Digital Potentiometers: Frequently Asked Questions (Rev. A)PDF 805 kB
AN-686: Implementing an I2C® Reset (Rev. 0)PDF 44 kB
Frequently Asked Questions
Documentnote
Order Information
Part NumberPackagePacking QtyTemp RangePrice 100-499Price 1000+RoHS
AD5251BRUZ1 Last Time Buy14 ld TSSOPOTH 96-40 to 105C2.72.4Y
AD5251BRUZ10 Last Time Buy14 ld TSSOPOTH 96-40 to 105C2.72.4Y
AD5251BRUZ100 Last Time Buy14 ld TSSOPOTH 96-40 to 105C2.72.4Y
AD5251BRUZ100-RL7 Last Time Buy14 ld TSSOPREEL 1000-40 to 105C02.4Y
AD5251BRUZ50 Production14 ld TSSOPOTH 96-40 to 105C2.72.4Y
Evaluation Boards
Part NumberDescriptionPriceRoHS
EVAL-AD5252SDZEvaluation Board59Y
EVAL-SDP-CB1ZEvaluation Controller Board99Y
Reference Materials
AD5251/AD5252: Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers Data Sheet (Rev. D) ad5251
AN-1291:数字电位计:常见问题解答 (Rev. A) ad8402
AN-1291: Digital Potentiometers: Frequently Asked Questions (Rev. A) ad8402
AN-686: 实现I²C®复位 (Rev. 0) adg729
AN-686: Implementing an I2C® Reset (Rev. 0) ad7993
为您的应用选择合适的数字电位计 ad8402