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AD5228: 32-Position Manual Up/Down Control Potentiometer Data Sheet (Rev. B)4/24/2009PDF341 kB
Overview
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
- 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
Product Details
The AD5228 is Analog Devices’ latest 32-step-up/step-down control digital potentiometer emulating mechanical potentiometer operation. 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
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
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AN-1291: Digital Potentiometers: Frequently Asked Questions8/18/2020
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AN-686: Implementing an I2C® Reset (Rev. 0)12/16/2003PDF44 kB
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AN-712: AD5228 Evaluation Kit for the 32-Position, Push Button, Up/Down Control Digital Potentiometer (Rev. 0)1/1/2000PDF754 kB
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UG-625: Evaluation Board for the AD5228 Digital Potentiometer5/22/2014PDF667 kB
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FAQs7/26/2017
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Choosing the Correct digiPOT for Your Application6/7/2013PDF311 K
Design Resources
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.View our quality and reliability program and certifications for more information.
| Part Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| AD5228BUJZ10-RL7 | Material Declaration | Reliability Data | 8-Lead TSOT | |
| AD5228BUJZ100-RL7 | Material Declaration | Reliability Data | 8-Lead TSOT | |
| AD5228BUJZ50-RL7 | Material Declaration | Reliability Data | 8-Lead TSOT | |
| Wafer Fabrication Data |
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Sample & Buy
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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.