Digital Resistor

Data Sheet

AD5246

Rev. C

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FEATURES

128-position

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

Ultracompact SC70-6 (2 mm × 2.1 mm) package

Full read/write of wiper register

Power-on preset to midscale

Single supply 2.7 V to 5.5 V

Rheostat mode temperature coefficient: 45 ppm/°C

Wide operating temperature –40°C to +125°C

APPLICATIONS

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

GENERAL OVERVIEW

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.

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

0.9 µA (3.3 V) allows for usage in portable battery-operated

applications.

1

The terms digital potentiometer, VR, and RDAC are used interchangeably

in this document.

FUNCTIONAL BLOCK DIAGRAM

WIPER

REGISTER

SDA

SCL

GND

A

W

B

Figure 1.