AD5254
PRODUCTIONQuad 256-Position I2C Nonvolatile Memory, Digital Potentiometer
Part Details
- Quad 256-position resolution
- 1 kΩ, 10 kΩ, 50 kΩ, 100 kΩ
- Nonvolatile memory stores wiper settings w/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
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, look-up table, or system identification information.
The AD5253 / AD5254 allow the host I2C 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. In this data sheet, the nonvolatile memory and EEMEM terms are used interchangeably, as are the digital potentiometer and RDAC terms.
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
Software Resources
Device Drivers 4
Evaluation Software 1
Hardware Ecosystem
Tools & Simulations
IBIS Model 1
Evaluation Kits
AD5254 Evaluation Board