128-Position I2C®-Compatible Digital Potentiometer
The AD5247 provides a compact, 2 mm × 2.1 mm, packaged solution for 128-position adjustment applications. This device performs the same electronic adjustment function as a mechanical potentiometer or a variable resistor. Available in four different end-to-end resistance values (5 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ), these low temperature coefficient devices are ideal for high accuracy and stability variable resistance adjustments.
The wiper settings are controllable through the I2C®-compatible digital interface, which can also be used to read back the present wiper register control word. The 10 kΩ and 100 kΩ options each have three hard-coded slave address options available to allow users access to three of these devices on one I2C bus (see Table 8 for a full list of slave address locations).
The resistance between the wiper and either end point of the fixed resistor varies linearly with respect to the digital code transferred into the RDAC latch. Note the terms digital potentiometer, VR (variable resistor), and RDAC are used interchangeably in this document.
Operating from a 2.7 V to 5.5 V power supply and consuming 3 μA allows the AD5247 to be used in portable battery-operated applications
- Mechanical potentiometer replacement in new designs
- Transducer adjustment of pressure, temperature, position, chemical, and optical sensors
- RF amplifier-biasing
- LCD brightness and contrast adjustment
- Automotive electronics adjustment
- Gain control and offset adjustment
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.
The AD5247 supports a single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications with a superior low temperature coefficient performance.
In addition, the AD5247 uses a versatile I2C serial interface that operates in fast mode, allowing speeds of up to 400 kHz.
The EVAL-AD5247DBZ and EVAL-MB-LV-SDZ can operate in single-supply mode and incorporate an internal power supply from the USB.
Complete specifications for the AD5247 part can be found in the AD5247 data sheet.
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.
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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.