GENERAL DESCRIPTION

The AD5253/AD5254 are quad channel, I2C, nonvolatile memory, digitally controlled potentiometers with 64/256 positions, respectively. These devices perform the same electronic adjust ment functions as mechanical potentiometers, trimmers, and variable resistors.

FEATURES

AD5253: Quad 64-position resolution

AD5254: Quad 256-position resolution

1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ

Nonvolatile memory1 stores wiper settings with write protection

Power-on refreshed to EEMEM settings in 300 µs typ

EEMEM rewrite time = 540 µs typ

Resistance tolerance stored in nonvolatile memory

12 extra bytes in EEMEM for user-defined information

I2C® compatible serial interface

Direct read/write accesses of RDAC2 and EEMEM registers

Predefined linear increment/decrement commands

Predefined ±6 dB step change commands

Synchronous or asynchronous quad channel update

Wiper setting readback

4 MHz bandwidth—1 kΩ version

Single supply 2.7 V to 5.5 V

Dual supply ±2.25 V to ±2.75 V

2 slave address decoding bits allow operation of 4 devices

100-year typical data retention, TA = 55°C

Operating temperature: –40°C to +85°C

APPLICATIONS

Mechanical potentiometer replacement

Low resolution DAC replacement

RGB LED backlight control

White LED brightness adjustment

RF base station power amp bias control

Programmable gain and offset control

Programmable attenuators

Programmable voltage-to-current conversion

Programmable power supply

Programmable filters

Sensor calibrations