概述

The AD5246 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 variable resistor. Available in four different end-to-end resistance values (5 kΩ, 10 kΩ, 50 kΩ, 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 resistance between the wiper and either end point of the fixed resistor varies linearly with respect to the digital code transferred into the RDAC1 latch.

Operating from a 2.7 V to 5.5 V power supply and consuming 3 μA allows for usage in portable battery-operated applications.

特点

128 Position

End-to-End Resistance 5kΩ, 10kΩ , 50kΩ , 100kΩ

Ultra-Compact SC70-6 (2 mm x 2.1 mm) Package

I2C Compatible Interface

Full Read/Write of Wiper Register

Power-on Preset to Midscale

Single Supply +2.7 V to +5.5 V

Low Temperature Coefficient 45 ppm/°C

Low Power, IDD=3 μA typical

Wide Operating Temperature –40°C to +125°C

Evaluation Board Available

Available in lead-free (Pb-free) package

应用

Mechanical potentiometer replacement in new designs

Transducer adjustment of pressure, temperature, position, chemical, and optical sensors

RF amplifier biasing

Automotive electronics adjustment

Gain control and offset adjustment

1The terms digital potentiometer, VR, and RDAC are used interchangeably in this document.