The ISL90840 integrates four digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit.

The digitally controlled potentiometers are implemented with a combination of resistor elements and CMOS switches. The position of the wipers are controlled by the user through the I²C bus interface. Each potentiometer has an associated volatile Wiper Register (WR) that can be directly written to and read by the user. The contents of the WR controls the position of the wiper. When powered on the ISL90810's wiper will always commence at mid-scale (128 tap position).

The DCPs can be used as three-terminal potentiometers or as two-terminal variable resistors in a wide variety of applications including control, parameter adjustments, and signal processing.

• Four potentiometers in one package
• 256 resistor taps - 0.4% resolution
• I²C serial interface
  • Three address pins, up to eight devices/bus
  • Write/Read capability
• Power-on preset to mid-scale (128 tap position)
• Wiper resistance: 70Ω typical @ 3.3V
• Standby current <5μA max
• Power supply: 2.7V to 5.5V
• 50kΩ, 10kΩ total resistance
• 20 Ld TSSOP package
• Pb-free plus anneal available (RoHS compliant)