AD5251

Data Sheet AD5251/AD5252 Dual 64-/256-Position I2C Nonvolatile Memory Digital Potentiometers FEATURES ► AD5251: Dual 64-position resolution ► AD5252: Dual 256-position resolution ► AD5251: 50 kΩ ► AD5252: 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ ► Nonvolatile memory 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 RDAC 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 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 +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 FUNCTIONAL BLOCK DIAGRAM Figure 1. GENERAL DESCRIPTION The AD5251/AD52521 are dual-channel, I2C, nonvolatile memory, digitally controlled potentiometers with 64/256 positions, respectively. T...