Low Noise, Low Power, 2-Wire Bus, 256 Taps Quad Digital Controlled Potentiometer (XDCP™)

Typical Diagram

enlarge +typical diagram

Key Features

    • Four potentiometers in one package
    • 256 resistor taps/potentiometer: 0.4% resolution
    • 2-wire serial interface
    • Wiper resistance, 40Ω typical @ V+ = 5V, V- = -5V
    • Four nonvolatile data registers for each potentiometer
    • Nonvolatile storage of wiper position
    • Standby current <5µA max (total package)
    • Power supplies
      • VCC = 2.7V to 5.5V
      • V+ = 2.7V to 5.5V
      • V- = -2.7V to -5.5V
    • 100kΩ, 50kΩ total potentiometer resistance
    • High reliability
      • Endurance: 100,000 data changes per bit per register
      • Register data retention: 100 years
    • 24 Ld SOIC, 24 Ld TSSOP
    • Dual supply version of X9259
    • Pb-free (RoHS compliant)


The X9258 integrates 4 digitally controlled potentiometers (XDCP™) on a monolithic CMOS integrated circuit.

The digitally controlled potentiometer is implemented using 255 resistive elements in a series array. Between each element are tap points connected to the wiper terminal through switches. The position of the wiper on the array is controlled by the user through the 2-wire bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 non-volatile Data Registers (DR0:DR3) that can be directly written to and read by the user. The contents of the WCR controls the position of the wiper on the resistor array though the switches. Power-up recalls the contents of DR0 to the WCR.

The XDCP™ can be used as a three-terminal potentiometer or as a two-terminal variable resistor in a wide variety of applications including control, parameter adjustments, and signal processing.


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