X9250| Datasheet

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X9250
Low Noise/Low Power/SPI Bus/256 Taps
Data Sheet August 29, 2006 FN8165.3

Quad Digitally Controlled Potentiometers (XDCPTM)
FEATURES Four potentiometers in one package 256 resistor taps/pot - 0.4% resolution SPI serial interface Wiper resistance, 40 typical @ VCC = 5V Four nonvolatile data registers for each pot Nonvolatile storage of wiper position Standby current < 5uA max (total package) Power supplies --VCC = 2.7V to 5.5V --V+ = 2.7V to 5.5V --V = -2.7V to -5.5V 100k, 50k total pot 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 X9251 Pb-free plus anneal available (RoHS compliant)

DESCRIPTION The X9250 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 SPI bus interface. Each potentiometer has associated with it a volatile Wiper Counter Register (WCR) and 4 nonvolatile 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.

BLOCK DIAGRAM
VCC VSS V+ VR0 R1 Wiper Counter Register (WCR) Pot 0 VH0/RH0 R0 R1 Wiper Counter Register (WCR) VH2/RH2

HOLD CS SCK SO SI A0 A1 WP

R2 R3

VL0/RL0 VW0/RW0

R2 R3

Resistor Array Pot 2

VL2/RL2 VW2/RW2

Interface and Control Circuitry Data

8 VW1/RW1 R0 R1 Wiper Counter Register (WCR) VH1/RH1 R0 R1 Wiper Counter Register (WCR) VW3/RW3 VH3/RH3

R2 R3

Resistor Array Pot1

VL1/RL1

R2 R3

Resistor Array Pot 3

VL3/RH3

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures. 1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc. XDCP is a trademark of Intersil Americas Inc. Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved All other trademarks mentioned are the property of their respective owners.