ADI AD5254BRUZ1

The AD5253/AD5254 are quad-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, lookup table, or system identification information. The AD5253/AD5254 allow the host controllers to write any of the 64-/256-step wiper settings in the RDAC registers and store them in the EEMEM. Once the settings are stored, they are restored automatically to the RDAC registers at system power-on; the settings can also be restored dynamically. The AD5253/AD5254 provide additional increment, decrement, +6 dB step change, and –6 dB step change in synchronous or asynchronous channel update mode. The increment and decrement functions allow stepwise linear adjustments, with a ±6 dB step change equivalent to doubling or halving the RDAC wiper setting. These functions are useful for steep-slope, nonlinear adjustments, such as white LED brightness and audio volume control. The AD5253/AD5254 have a patented resistance-tolerance storing function that allows the user to access the EEMEM and obtain the absolute end-to-end resistance values of the RDACs for precision applications. The AD5253/AD5254 are available in TSSOP-20 packages in 1 kΩ, 10 kΩ, 50 kΩ, and 100 kΩ options. All parts are guaranteed to operate over the -40°C to +105°C extended industrial temperature range.

• AD5253: quad 64-position resolution
• AD5254: quad 256-position resolution
• 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
• Nonvolatile memory 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 access of RDAC 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 +105°C

• 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