1

®

X9409

Low Noise/Low Power/2-Wire Bus

Quad Digitally Controlled Potentiometers

(XDCP™)

FEATURES

• Four potentiometers per package

• 64 resistor taps

• 2-wire serial interface for write, read, and trans-

fer operations of the potentiometer

•50

Ω Wiper resistance, 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 typical

•10k

Ω, 2.5kΩ End to end resistance

• 100 yr. data retention

• Endurance: 100,000 data changes per bit per

register

• Low power CMOS

• 24 Ld SOIC, 24 Ld TSSOP

• Pb-free plus anneal available (RoHS compliant)

DESCRIPTION

The

X9409

integrates

4

digitally

controlled

potentiometers

(XDCP)

on

a

monolithic

CMOS

integrated microcircuit.

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 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 through 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

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. All Rights Reserved

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

PRELIMINARY

Data Sheet

FN8192.3

October 19, 2005