Nonvolatile, IC Compatible 256-Position, Digital Potentiometer

The AD5259 provides a compact, nonvolatile LFCSP-10 (3 mm x 3 mm) or MSOP-10 (3 mm x 4.9 mm) packaged solution for 256-position adjustment applications. These devices perform the same electronic adjustment function as mechanical potentiometers or variable resistors, but with enhanced resolution and solid-state reliability. The terms digital potentiometer, VR (variable resistor), and RDAC are used interchangeably.

The wiper settings are controllable through an I2C-compatible digital interface that is also used to read back the wiper register and EEPROM content. Resistor tolerance is also stored within EEPROM, providing an end-to-end tolerance accuracy of 0.1%.

A separate VLOGIC pin delivers increased interface flexibility. For users who need multiple parts on one bus, Address Bit AD0 and Address Bit AD1 allow up to four devices on the same bus

APPLICATIONS

* LCD panel VCOM adjustment

* LCD panel brightness and contrast control

* Mechanical potentiometer replacement in new designs

* Programmable power supplies

* RF amplifier biasing

* Automotive electronics adjustment

* Gain control and offset adjustment

* Fiber to the home systems

* Electronics level settings

* Nonvolatile memory maintains wiper settings

* 256-position

* Thin LFCSP-10 (3 mm x 3 mm x 0.8 mm) package

* Compact MSOP-10 (3 mm × 4.9 mm × 1.1 mm) package

* I2C-compatible interface

* VLOGIC pin provides increased interface flexibility

* End-to-end resistance 5 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

* Resistance tolerance stored in EEPROM (0.1% accuracy)