1

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X9258

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

Quad Digital Controlled Potentiometers

(XDCP™)

FEATURES

• Four potentiometers in one package

• 256 resistor taps/pot–0.4% resolution

• 2-wire serial interface

• Wiper resistance, 40

Ω typical @ V+ = 5V, V- = -5V

• Four nonvolatile data registers for each pot

• 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

• 100k

Ω, 50kΩ 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 X9259

• Pb-free plus anneal available (RoHS compliant)

DESCRIPTION

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 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

Interface

and

Control

Circuitry

SCL

SDA

A0

A1

A2

A3

Wiper

Counter

Register

(WCR)

Resistor

Array

Pot 1

Wiper

Counter

Register

(WCR)

Data

8

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

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.

Data Sheet

FN8168.4

August 30, 2006