1

®

X9408

Low Noise/Low Power/2-Wire Bus

Quad Digitally Controlled (XDCP™)

Potentiometers

FEATURES

• Four potentiometers in one package

• 64 resistor taps per potentiometer

• 2-wire serial interface

• Wiper resistance, 40

Ω typical at 5V

• Four nonvolatile data registers for each pot

• Nonvolatile storage of wiper position

• Standby current < 1µA max (total package)

V+ = 2.7V to 5.5V

V- = –2.7V to -5.5V

•10k

Ω, 2.5kΩ end to end resistances

• High reliability

—Endurance–100,000 data changes per bit per

register

—Register data retention–100 years

• 24 Ld SOIC, 24 Ld TSSOP, 24 Ld PDIP packages

• Pb-free plus anneal available (RoHS compliant)

DESCRIPTION

The

X9408

integrates

four

digitally

controlled

potentiometers

(XDCP)

on

a

monolithic

CMOS

integrated circuit.

The digital 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 four

non-volatile Data Registers 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. Powerup recalls the contents of

the default data register (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

R0 R1

R2 R3

Wiper

Counter

Register

(WCR)

Resistor

Array

Pot 1

R0 R1

R2 R3

Wiper

Counter

Register

(WCR)

Data

8

R0 R1

R2 R3

Resistor

Array

R0 R1

R2 R3

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. All Rights Reserved

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

Data Sheet

FN8191.2

September 19, 2005