X9408

DATASHEET X9408 Low Noise/Low Power/2-Wire Bus Quad Digitally Controlled (XDCP™) Potentiometers FN8191 Rev.4.00 January 15, 2009 Description The X9408 integrates four digitally controlled potentiometers (XDCP) on a monolithic CMOS integrated circuit. The digital controlled potentiometer is implemented using 63 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 four non-volatile Data Registers 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 the default data register (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. Features Four Potentiometers in One Package 64 Resistor Taps per Potentiometer 2-wire Serial Interface Wiper Resistance, 40 Typical at 5V Four Nonvolatile Data Registers for Each Pot Nonvolatile Storage of Wiper Position Standby Current < 1µA max (Total Package) VCC = 2.7V to 5.5V Operation V+ = 2.7V to 5.5V V- = -2.7V to -5.5V 10k, 2.5k End to End Resistances High reliability Endurance–1...