AD5254

PRODUCTION

Quad 256-Position I2C Nonvolatile Memory, Digital Potentiometer

Data Sheet (Rev. D) Product Selection Table
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Overview

  • 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
AD5254
Quad 256-Position I2C Nonvolatile Memory, Digital Potentiometer
AD5253/AD5254 Functional Block Diagram AD5253/AD5254 Pin Configuration
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Documentation

Data Sheet 1

User Guide 1

Application Note 3

Frequently Asked Question 1

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Software Resources

FPGA/HDL 1

Hardware Ecosystem

Parts Product Life Cycle Description
AD5144
PRODUCTION Quad Channel, 256-Position, I2C / SPI, Nonvolatile Digital Potentiometer
AD5144A
PRODUCTION Quad Channel, 256-Position, I2C, Nonvolatile Digital Potentiometer
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Tools & Simulations

IBIS Model 1

Evaluation Kits

eval board
schematic 1
EVAL-AD5254

AD5254 Evaluation Board

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Features and Benefits

  • Full featured evaluation board for the AD5254
  • Several test circuits
  • Various ac/dc input signals
  • PC control via a separately purchased system development platform (SDP)
  • PC control software
  • 12 extra bytes in EEMEM for user-defined information
  • Resistor tolerance error stored in EEMEM

Product Details

With versatile programmability, the AD5254 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 read-back, and extra EEMEM for storing user-defined information, such as memory data for other components or a lookup table.

The AD5254 supports a dual-supply ±2.25 V to ±2.75 V operation and a single-supply 2.7 V to 5.5 V operation, making the device suited for battery-powered applications and many other applications. In addition, the AD5254 uses a versatile I2C serial interface that operates in fast mode, allowing speeds of up to 400 kbps and supporting the selection of up to four different I2C addresses.

The EVAL-AD5254SDZ can operate in single-supply and dual-supply mode and incorporates an internal power supply from the USB.

Complete specifications for the AD5254 part can be found in the AD5254 data sheet.
EVAL-AD5254
AD5254 Evaluation Board
EVAL-AD5254SDZ

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