GENERAL DESCRIPTION

The AD5251/AD5252 are dual-channel, I2C?, nonvolatile memory, digitally controlled potentiometers with 64/256 positions, respectively. These devices perform the same electronic adjustment functions as mechanical potentiometers, trimmers, and variable resistors. The parts’ versatile programmability allows multiple modes of operation, including read/write access in the RDAC and EEMEM registers, increment/decrement of resistance, resistance changes in ±6 dB scales, wiper setting readback, and extra EEMEM for storing user-defined information, such as memory data for other components, look-up table, or system identification information.

FEATURES

AD5251: Dual 64-position resolution

AD5252: Dual 256-position resolution

1 k?, 10 k?, 50 k?, 100 k?

Nonvolatile memory1 stores wiper setting w/write protection

Power-on refreshed with 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 access of RDAC2 and EEMEM registers

Predefined linear increment/decrement commands

Predefined ±6 dB step change commands

Synchronous or asynchronous dual-channel update

Wiper setting readback

4 MHz bandwidth—1 k? 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 +105°C

APPLICATIONS

Mechanical potentiometer replacement

General-purpose DAC replacement

LCD panel VCOM adjustment

White LED brightness adjustment

RF base station power amp bias control

Programmable gain and offset control

Programmable voltage-to-current conversion

Programmable power supply

Sensor calibrations

AD5251BRU1-RL7屬于集成電路（IC） > 數(shù)字電位計(jì)。亞德諾半導(dǎo)體技術(shù)有限公司制造生產(chǎn)的AD5251BRU1-RL7數(shù)字電位計(jì)數(shù)字電位器是一系列集成電路器件，可提供類似于傳統(tǒng)機(jī)械電位器或變阻器的可調(diào)節(jié)電阻，但通過電子信號而非機(jī)械輸入來進(jìn)行控制。雖然這些器件的電阻可耗散的電能相對有限，但其電子控制能力有助于小型化、自動化和遠(yuǎn)程控制信號級模擬電路，而這些電路本來可能會使用機(jī)械電位器。