X9258

DATASHEET X9258 Low Noise/Low Power/2-Wire Bus/256 Taps Quad Digital Controlled Potentiometers (XDCP™) FN8168 Rev 6.00 December 15, 2011 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. 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 potentio...