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X9258

Low Noise/Low Power/2-Wire Bus/256 Taps

Quad Digital Controlled Potentiometers

(XDCP™)

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

- V+ = 2.7V to 5.5V

- V- = -2.7V to -5.5V

•100kΩ, 50kΩ total potentiometer 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 X9259

• Pb-free (RoHS compliant)

Block Diagram

INTERFACE

AND

CONTROL

CIRCUITRY

SCL

SDA

A0

A1

A2

A3

WIPER

COUNTER

REGISTER

(WCR)

RESISTOR

ARRAY

POT 1

WIPER

COUNTER

REGISTER

(WCR)

DATA

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RESISTOR

ARRAY

RESISTOR

ARRAY

WIPER

COUNTER

REGISTER

(WCR)

WIPER

COUNTER

REGISTER

(WCR)

POT 3

POT 2

WP

POT 0

V+

V-

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) and XDCP are trademarks owned by Intersil Corporation or one of its subsidiaries.

All other trademarks mentioned are the property of their respective owners.

Data Sheet

FN8168.6

December 15, 2011