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General Description

The DS3904 contains three nonvolatile (NV) low tem-

perature coefficient variable digital resistors. Each

resistor has 128 user-selectable positions. Additionally,

the DS3904 has a high-impedance option that allows

each resistor to function as a digital switch. The

DS3904 can operate over a 2.7V to 5.5V supply voltage

range, and communication with the device is achieved

through a 2-wire serial interface. An address pin allows

two DS3904s to operate on the same bus. The low-cost

and small size of the DS3904 make it an ideal replace-

ment for conventional mechanical trimming resistors.

Applications

Power-Supply Calibration

Cell Phones and PDAs

Fibre Optic Transceiver Modules

Portable Electronics

Small and Low-Cost Replacement for

Conventional Mechanical Trimming Resistors

Test Equipment

Features

♦ Three 20kΩ, 128-Position Linear Digital Resistors

♦ Resistor Settings are Stored in NV Memory

♦ Each Resistor has a High-Impedance Setting for

Switch Operation to Control Digital Logic

♦ Low Temperature Coefficient

♦ 2-Wire Serial Interface

♦ 2.7V to 5.5V Operating Range

♦ Industrial Temperature Range: -40°C to +85°C

♦ Packaging: 8-Pin µSOP

DS3904

Triple 128-Position Nonvolatile

Variable Digital Resistor/Switch

_____________________________________________ Maxim Integrated Products 1

SDA

SCL

µSOP

GND

DS3904

Pin Configuration

0.1µF

4.7kΩ

2-WIRE

MASTER

RHIZ

1.75kΩ

SCL

SDA

RESISTOR 0

20kΩ

ADDR F8h

RESISTOR 1

20kΩ

ADDR F9h

RESISTOR 2

20kΩ

ADDR FAh

GND

4.7kΩ

VARIABLE RESISTANCE

FOR ADJUSTABLE

CURRENT SOURCE

2-WIRE

ADDRESSABLE

SWITCH (USING 00h

AND RHIZ)

GAIN

CONTROL

DS3904

RHIZ

5.1kΩ

DIGITAL

LOGIC

20kΩ

Typical Operating Circuit

Ordering Information

Rev 0; 1/03

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART

TEMP RANGE

PIN-

PACKAGE

RESISTANCE

DS3904

-40°C to +85°C

8 µSOP

20kΩ + Hi-Z

1 2 3 4 5 6 ... 10 11

Resumo do Conteúdo

Página 1 - Rev 0; 1/03

General DescriptionThe DS3904 contains three nonvolatile (NV) low tem-perature coefficient variable digital resistors. Eachresistor has 128 user-selec

Página 2 - DC ELECTRICAL CHARACTERISTICS

DS3904DS3904 Triple 128-Position NonvolatileVariable Digital Resistor/Switch10 _____________________________________________________________________ma

Página 3 - AC ELECTRICAL CHARACTERISTICS

DS3904DS3904 Triple 128-Position Nonvolatile Variable Digital Resistor/SwitchMaxim cannot assume responsibility for use of any circuitry other than ci

Página 4

DS3904DS3904 Triple 128-Position Nonvolatile Variable Digital Resistor/Switch2 ______________________________________________________________________A

Página 5

DS3904DS3904 Triple 128-Position Nonvolatile Variable Digital Resistor/Switch_____________________________________________________________________ 3AC

Página 6

DS3904DS3904 Triple 128-Position NonvolatileVariable Digital Resistor/Switch4 ______________________________________________________________________No

Página 7 - Variable Resistor

DS3904DS3904 Triple 128-Position Nonvolatile Variable Digital Resistor/Switch_____________________________________________________________________ 5Ty

Página 8 - 2-Wire Serial Port Operation

DS3904DS3904 Triple 128-Position NonvolatileVariable Digital Resistor/Switch6 ______________________________________________________________________AB

Página 9

DS3904DS3904 Triple 128-Position Nonvolatile Variable Digital Resistor/Switch_____________________________________________________________________ 7De

Página 10

DS3904DS3904 Triple 128-Position NonvolatileVariable Digital Resistor/Switch8 ______________________________________________________________________St

Página 11 - Package Information

DS3904DS3904 Triple 128-Position Nonvolatile Variable Digital Resistor/Switch_____________________________________________________________________ 9Da

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Rainbow-electronics DS3904 Manual do Utilizador

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