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AD5252:  I2C, Nonvolatile Memory, Dual 256-Position Digital Potentiometer

Product Details


The AD5252 is a dual channel, digitally controlled variable resistor (VR) with resolutions of 256 positions. This device performs the same electronic adjustment function as a potentiometer or variable resistor. The AD5252’s 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

Functional Block Diagram for AD5252

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Additional Evaluation Board Information

If you purchase the evaluation board model of this product, you will also need the System Demonstration Platform (SDP). They are used in conjunction as part of a customer evaluation environment.

Documentation

Title Content Type File Type
AD5251/AD5252: Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers Data Sheet (Rev D, 10/2012) (pdf, 607 kB) Data Sheets PDF
AN-1291: Digital Potentiometers: Frequently Asked Questions  (pdf, 805 kB) Application Notes PDF
AN-686: Implementing an I2C® Reset  (pdf, 44 kB) Application Notes PDF
Choosing the Correct digiPOT for Your Application  (pdf, 431 kB) Design Handbooks PDF
Webinar: Digital Potentiometers - Where and How to Use
Digital Potentiometers (digiPOTs) provide a convenient way to adjust the ac or dc voltage or current output of sensors, power supplies, or other devices that require some type of calibration. This webcast will describe the function, use and advantages of using digital potentiometers in various applications. The webinar will also highlight the main parameters to be considered when designing a circuit using a digital potentiometer.
Webcasts WEBCAST
Understanding and Applying Digital Potentiometers
In this webcast our experts will explain the differences between Pots and DigiPots and DACs, and present considerations for successful designs for many applications.
Webcasts WEBCAST
UG-274: Evaluation Board for the AD5252 Digital Potentiometer  (pdf, 577 kB) User Guides PDF
Choosing the Correct digiPOT for Your Application  (pdf, 431 kB) Overview PDF
Is there a power up sequence I should follow? FAQs/RAQs HTML
For dual supply digital potentiometers, if VDD/VSS are +2.5V/-2.5V respectively, can digital inputs be fed from a standard 3.3V CMOS logic component without logic level translation? What are the logic level thresholds when VDD is +2.5V and VSS is -2.5V? FAQs/RAQs HTML
Is there a dependency between the logic level and power consumption? FAQs/RAQs HTML
Is digital potentiometer a real replacement for mechanical potentiometer or are there restrictions regarding voltage potentials? FAQs/RAQs HTML
Are all digital potentiometers limited to |5V|? FAQs/RAQs HTML
Do digital potentiometers handle bipolar and AC operations? FAQs/RAQs HTML
Can I achieve a 15V signal swing when using a 5V digital potentiometer? FAQs/RAQs HTML
For digital potentiometers that do not have nonvolatile memory, what is the state during power up? FAQs/RAQs HTML
Is there a particularly low-power digital potentiometer? FAQs/RAQs HTML
Does the memory allow the device to return to the last stored value without an update from a micro? FAQs/RAQs HTML
Will the data in the EEMEM need to be refreshed after 15 yrs when it is operated at 55°C? FAQs/RAQs HTML
How many write cycles can the EEMEM go through before it fails? FAQs/RAQs HTML
After the specified EEMEM data retention timeout period, can the power be turned off and back on so that the part is considered "refreshed"? FAQs/RAQs HTML
Why are some digital potentiometers' maximum operating temperature only 85°C instead of the standard 125°C? FAQs/RAQs HTML
How good is the resistance matching between Ch1 and Ch2 in the dual digital potentiometer? FAQs/RAQs HTML
How is the resistance matching device to device? FAQs/RAQs HTML
What is the resistance tolerance of the digital potentiometers? FAQs/RAQs HTML
Can I cascade, serialize, or parallel multiple digital potentiometers to get the resistance or resolution I need? My requirement is for a 250 Ω digital potentiometer with approximately 1 Ω/step. I plan to use four 1 kΩ AD8403 in parallel with each set to nominally the same value. FAQs/RAQs HTML
I would like to know how the digital potentiometer is built. How ideal are the wiper switches? FAQs/RAQs HTML
What is the tempco of the digital potentiometer? FAQs/RAQs HTML
What is the maximum current I can force into the digital potentiometer? FAQs/RAQs HTML
Can a digitally controlled variable resistor withstand greater than 20mA? FAQs/RAQs HTML
Can a digipot be used to construct a programmable high current source? FAQs/RAQs HTML
If I use the digital potentiometer in a "dry" circuit (current through wiper < 1 pA), will it behave as a linear resistor in rheostat mode? FAQs/RAQs HTML
Are ADI's digital potentiometers suitable for use in photodetector amplifiers and will they suffer from leakage currents which could affect the gain of the circuit? FAQs/RAQs HTML
Regarding the spec on R-DNL, I am only concerned with relative adjustments. I'm not concerned with the actual value of the resistor in the digipot but need the digipot to be monotonic. FAQs/RAQs HTML
Can I adjust the digital potentiometer for frequencies around 1MHz to 10MHz for adjusting the gain of a video signal? FAQs/RAQs HTML
What is the maximum frequency that can be applied to the digital potentiometer CLK input? FAQs/RAQs HTML
Is there crosstalk between Ch1 and Ch2 of a dual digital potentiometer such that a sine wave applied to Ch1 will occur in Ch2 as well? FAQs/RAQs HTML
If I program Ch 1 from zero to full scale, will I expect Ch 2 to be disturbed? FAQs/RAQs HTML
Digital Feedthrough FAQs/RAQs HTML
How is the THD performance of digital potentiometer? FAQs/RAQs HTML
If I use the digital potentiometer in audio volume control, will I experience zipper noise? FAQs/RAQs HTML
For a digital potentiometer that requires 6-bit word length, what happens if I have 8-bit word length from my PC? FAQs/RAQs HTML
For a digital potentiometer that requires 12-bit word length, how can I control with only 8-bit word length from my micro? FAQs/RAQs HTML
Do you provide any software to control the digital potentiometers? FAQs/RAQs HTML
How do I daisy-chain multiple potentiometers? How does the serial interface work for multiple AD8403's when there are still only two address bits? Are there multiple /CS lines, one for each individual chip? FAQs/RAQs HTML
Can I program two channels of a multi-channel digital potentiometer at the same time? FAQs/RAQs HTML
Can I read back the wiper setting of the digital potentiometers? FAQs/RAQs HTML
Can I read back the contents of the two RDAC registers of AD5242 or AD5282 (dual I2C compatible digital potentiometer)? FAQs/RAQs HTML
Is there a digital potentiometer controlled by a parallel input? FAQs/RAQs HTML
Can digital potentiometers do log taper adjustment? FAQs/RAQs HTML
I'm unsure about how to use pin 13 write protect (/WP), pin 14 preset (/PR), and pin 16 ready (RDY)? FAQs/RAQs HTML
Why Should I replace mechanical potentiometers with digiPOT? FAQs/RAQs HTML
What should I watch out for when I replace mechanical potentiometers with digital potentiometers? FAQs/RAQs HTML
What is the ESD rating of digital potentiometers? FAQs/RAQs HTML
How do I tell the end-to-end RAB resistance value? FAQs/RAQs HTML
What are the common failure modes of digital potentiometers? FAQs/RAQs HTML
Are there any evaluation boards for the digital potentiometers? FAQs/RAQs HTML
Are PB-free digital potentiometers available? FAQs/RAQs HTML
Can I use the new PB-free DigiPOTs in my traditional solder based PCB assembly process? FAQs/RAQs HTML
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Multiple I2C Slave Devices Addressing FAQs/RAQs HTML
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Evaluation Kits & Symbols & Footprints

Evaluation Boards & KitsView the Evaluation Boards and Kits page for documentation and purchasing

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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Price, packaging, availability

AD5252 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD5252BRU1 Status: Production 14 ld TSSOP 14 Ind Tube, 96 $2.06 $1.86 N  Material Info PCN Purchase
AD5252BRU1-RL7 Status: Last Time Buy 14 ld TSSOP 14 Ind Reel, 1000 $2.06 $1.86 N  Material Info PCN/PDN Purchase
AD5252BRU10 Status: Production 14 ld TSSOP 14 Ind Tube, 96 $2.06 $1.86 N  Material Info PCN Purchase
AD5252BRU10-RL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 $2.06 $1.86 N  Material Info PCN Purchase
AD5252BRU100 Status: Last Time Buy 14 ld TSSOP 14 Ind Tube, 96 $2.06 $1.86 N  Material Info PCN/PDN Purchase
AD5252BRU100-RL7 Status: Last Time Buy 14 ld TSSOP 14 Ind Reel, 1000 $2.06 $1.86 N  Material Info PCN/PDN Purchase
AD5252BRU50 Status: Last Time Buy 14 ld TSSOP 14 Ind Tube, 96 $2.06 $1.86 N  Material Info PCN/PDN Purchase
AD5252BRU50-RL7 Status: Last Time Buy 14 ld TSSOP 14 Ind Reel, 1000 $2.06 $1.86 N  Material Info PCN/PDN Purchase
AD5252BRUZ1 Status: Production 14 ld TSSOP 14 Ind Tube, 96 $1.78 $1.61 Y  Material Info PCN Purchase Sample
AD5252BRUZ1-RL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 $1.78 $1.61 Y  Material Info PCN Purchase
AD5252BRUZ10 Status: Production 14 ld TSSOP 14 Ind Tube, 96 $1.78 $1.61 Y  Material Info PCN Purchase Sample
AD5252BRUZ10-RL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 $1.78 $1.61 Y  Material Info PCN Purchase
AD5252BRUZ100 Status: Production 14 ld TSSOP 14 Ind Tube, 96 $1.78 $1.61 Y  Material Info PCN Purchase Sample
AD5252BRUZ100-RL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 $1.78 $1.61 Y  Material Info PCN Purchase
AD5252BRUZ50 Status: Production 14 ld TSSOP 14 Ind Tube, 96 $1.78 $1.61 Y  Material Info PCN Purchase Sample
AD5252BRUZ50-RL7 Status: Production 14 ld TSSOP 14 Ind Reel, 1000 $1.78 $1.61 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

AD5252 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
EVAL-AD5252SDZ Status: Production Evaluation Board $59.00 Yes -
EVAL-SDP-CB1Z Status: Production Evaluation Controller Board $99.00 Yes -

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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