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AD5228:  32-Position Manual Up/Down Control Potentiometer

Product Details


The AD5228 is Analog Devices’ latest 32-step-up/step-down control digital potentiometer emulating mechanical potenti-ometer operation1. Its simple up/down control interface allows manual control with just two external pushbutton tactile switches. The AD5228 is designed with a built-in adaptive debouncer that ignores invalid bounces due to contact bounce commonly found in mechanical switches. The debouncer is adaptive, accommodating a variety of pushbutton tactile switches that generally have less than 10 ms of bounce time during contact closures. When choosing the switch, the user should consult the timing specification of the switch to ensure its suitability in an AD5228 application.

The AD5228 can increment or decrement the resistance in discrete steps or in autoscan mode. When the PU or PD button is pressed briefly (no longer than 0.6 s), the resistance of the AD5228 changes by one step. When the PU or PD button is held continuously for more than a second, the device activates the autoscan mode and changes four resistance steps per second.

The AD5228 can also be controlled digitally; its up/down features simplify microcontroller usage. The AD5228 is available in a compact thin SOT-23-8 (TSOT-8) package. The part is guaranteed to operate over the automotive temperature range of −40°C to +105°C.

The AD5228’s simple interface, small footprint, and very low cost enable it to replace mechanical potentiometers and trimmers with typically 3× improved resolution, solid-state reliability, and faster adjustment, resulting in considerable cost saving in end users’ systems.

Users who consider EEMEM potentiometers should refer to the recommendations in the Applications section.

Applications

  • Mechanical potentiometer and trimmer replacements
  • LCD backlight, contrast, and brightness controls
  • Digital volume control
  • Portable device-level adjustments
  • Electronic front panel-level controls
  • Programmable power supply
  • 1 The terms digital potentiometer and RDAC are used interchangeably.

    FEATURES and BENEFITS

    • 32-position digital potentiometer
    • 10 kΩ, 50 kΩ, 100 kΩ end-to-end terminal resistance
    • Simple manual up/down control
    • Self-contained, requires only 2 pushbutton tactile switches
    • Built-in adaptive debouncer
    • Discrete step-up/step-down control
    • Autoscan up/down control with 4 steps per second
    • Pin-selectable zero-scale/midscale preset
    • Low potentiometer mode tempco, 5 ppm/°C
    • Low rheostat mode tempco, 35 ppm/°C
    • Digital control compatible
    • Ultralow power, IDD = 0.4 μA typ and 3 μA max
    • See data sheet for additional features

    AD5228 Functional Block Diagram

    AD5228 Functional Block Diagram
    AD5228 Functional Block Diagram

    Similar Products

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    Documentation

    Title Content Type File Type
    AD5228: 32-Position Manual Up/Down Control Potentiometer Data Sheet  (Rev A, 04/2009) (pdf, 341 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
    AN-712: AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control Digital Potentiometer  (pdf, 754 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-625: Evaluation Board for the AD5228 Digital Potentiometer  (pdf, 667 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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    RAQs index Rarely Asked Questions 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.

    SampleSample & Buy

    Price, packaging, availability

    AD5228 Model Options
    Model Package Pins Temp.
    Range
    Packing,
    Qty
    Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    AD5228BUJZ10-R2 Status: Production 8 ld TSOT 8 Ind Reel, 250 $0.61 $0.61 Y  Material Info PCN Purchase
    AD5228BUJZ10-RL7 Status: Production 8 ld TSOT 8 Ind Reel, 3000 - $0.34 Y  Material Info PCN Purchase Sample
    AD5228BUJZ100-R2 Status: Production 8 ld TSOT 8 Ind Reel, 250 $0.61 $0.61 Y  Material Info PCN Purchase
    AD5228BUJZ100-RL7 Status: Production 8 ld TSOT 8 Ind Reel, 3000 - $0.34 Y  Material Info PCN Purchase Sample
    AD5228BUJZ50-R2 Status: Obsolete 8 ld TSOT 8 Ind Reel, 250 - - Y  Material Info PCN/PDN Contact ADI
    AD5228BUJZ50-RL7 Status: Production 8 ld TSOT 8 Ind Reel, 3000 - $0.34 Y  Material Info PCN Purchase Sample
    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.

    AD5228 Evaluation Board
    Model Description Price RoHS View PCN/ PDN Check Inventory/
    Purchase/Sample
    EVAL-AD5228EBZ Status: Last Time Buy Evaluation Board - Yes - Contact ADI

    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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