GENERAL DESCRIPTION

The AD5122A/AD5142A potentiometers provide a nonvolatile solution for 128-/256-position adjustment applications, offering guaranteed low resistor tolerance errors of ±8% and up to ±6 mA current density in the Ax, Bx, and Wx pins.

The low resistor tolerance and low nominal temperature coefficient simplify open-loop applications as well as applications requiring tolerance matching.

The linear gain setting mode allows independent programming of the resistance between the digital potentiometer terminals, through RAW and RWB the string resistors, allowing very accurate resistor matching.

The high bandwidth and low total harmonic distortion (THD) ensure optimal performance for ac signals, making it suitable for filter design.

The low wiper resistance of only 40 Ω at the ends of the resistor array allows for pin-to-pin connection.

The wiper values can be set through an I2C-compatible digital interface that is also used to read back the wiper register and EEPROM contents.

The AD5122A/AD5142A are available in a compact, 16-lead, 3 mm × 3 mm LFCSP and a 16-lead TSSOP. The parts are guaranteed to operate over the extended industrial temperature range of −40°C to +125°C.

FEATURES

  10 kΩ and 100 kΩ resistance options

  Resistor tolerance: 8% maximum

  Wiper current: ±6 mA

  Low temperature coefficient: 35 ppm/°C

  Wide bandwidth: 3 MHz

  Fast start-up time < 75 μs

  Linear gain setting mode

  Single- and dual-supply operation

  Independent logic supply: 1.8 V to 5.5 V

  Wide operating temperature: −40°C to +125°C

  3 mm × 3 mm package option

  4 kV ESD protection

APPLICATIONS

  Portable electronics level adjustment

  LCD panel brightness and contrast controls

  Programmable filters, delays, and time constants

  Programmable power supplies