DESCRIPTION

   The X9400 integrates four digitally controlled potentiometers (XDCPs) on a monolithic CMOS integrated circuit.

   The digitally 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 SPI serial bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and four nonvolatile Data Registers (DR0-3) 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 through the switches. Power-up recalls the contents of DR0 to the WCR.

FEATURES

• Four potentiometers per package

• 64 resistor taps

• SPI serial interface for write, read, and transfer

   operations of the potentiometer

• Wiper resistance, 40 typical at 5V.

• Four non-volatile data registers for each

   potentiometer

• Non-volatile storage of multiple wiper position

• Power-on recall. Loads saved wiper position on

   power-up.

• Standby current < 1µA max

• System VCC: 2.7V to 5.5V operation

• Analog V+/V–: -5V to +5V

• 10k, 2.5k end to end resistance

• 100 yr. data retention

• Endurance: 100,000 data changes per bit per

   register

• Low power CMOS

• 24 Ld SOIC and 24 Ld TSSOP

• Pb-free plus anneal available (RoHS compliant)