Rainbow-electronics DS1087L Manual de usuario descargar pdf

General Description

The DS1087L is a clock generator that produces a

spread-spectrum (dithered) square-wave output of fre-

quencies from 130kHz to 66.6MHz. The DS1087L is

shipped from the factory programmed at a specific fre-

quency and spread-spectrum percentage. The user still

has access to an internal frequency divider, selectable

2% or 4% dithered output, and programmable output

power-down/disable mode through a 2-wire program-

ming interface. All the device settings are stored in non-

volatile (NV) EEPROM allowing it to operate in

stand-alone applications. The DS1087L has power-

down and output-enable control pins for power-sensi-

tive applications.

Applications

Printers

Copiers

PCs

Computer Peripherals

Cell Phones

Cable Modems

Features

♦ Factory Programmed Square-Wave Generator

from 130kHz to 66.6MHz

♦ No External Timing Components Required

♦ EMI Reduction

♦ 2.7V to 3.6V Supply

♦ User Programmable Down to 130kHz with Divider

(Dependent on Master Oscillator Frequency)

♦ 2% or 4% Selectable Dithered Output

♦ Glitchless Output-Enable Control

♦ 2-Wire Serial Interface

♦ Nonvolatile Settings

♦ Power-Down Mode

♦ Programmable Output Power-Down/Disable Mode

DS1087L

3.3V Spread-Spectrum EconOscillator

______________________________________________ Maxim Integrated Products 1

PDN

OEGND

SCL

SDASPRD

OUT

µSOP (118 mils)

TOP VIEW

DS1087L

Pin Configuration

Ordering Information

Rev 0; 7/03

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

DS1087LU-yxx -40°C to +85°C

8 µSOP (118 mils)

EconOscillator is a trademark of Dallas Semiconductor.

Typical Operating Circuits appear at end of data sheet.

Standard Frequency Options

PART

FREQUENCY (MHz)

SPREAD (%)

DS1087LU-202

2.0480 2

DS1087LU-402

2.0480 4

DS1087LU-210

10.0 2

DS1087LU-216

16.6 2

DS1087LU-266

66.6 2

DS1087LU-466

66.6 4

DS1087LU-yxx

Fixed up to 66.6 2 or 4

Custom frequencies and over 20 standard frequencies avail-

able, contact factory.

1 2 3 4 5 6 ... 11 12

Indice de contenidos

Pagina 1

General DescriptionThe DS1087L is a clock generator that produces aspread-spectrum (dithered) square-wave output of fre-quencies from 130kHz to 66.6MH

Pagina 2 - DC ELECTRICAL CHARACTERISTICS

DS1087L3.3V Spread-Spectrum EconOscillator10 ____________________________________________________________________Data valid: The state of the data lin

Pagina 3 - AC ELECTRICAL CHARACTERISTICS

DS1087L3.3V Spread-Spectrum EconOscillator____________________________________________________________________ 11Application InformationPower-Supply D

Pagina 4

DS1087L3.3V Spread-Spectrum EconOscillatorMaxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxi

Pagina 5 - = 3.3V, T

DS1087L3.3V Spread-Spectrum EconOscillator2 _____________________________________________________________________ABSOLUTE MAXIMUM RATINGSRECOMMENDED D

Pagina 6

DS1087L3.3V Spread-Spectrum EconOscillator_____________________________________________________________________ 3MASTER OSCILLATOR CHARACTERISTICS (VC

Pagina 7 - Pin Description

DS1087L3.3V Spread-Spectrum EconOscillator4 _____________________________________________________________________AC ELECTRICAL CHARACTERISTICS—2-WIRE

Pagina 8 - Register Summary

DS1087L3.3V Spread-Spectrum EconOscillator_____________________________________________________________________ 5Note 1: All voltages are referenced t

Pagina 9 - 2-Wire Serial Data Bus

DS1087L3.3V Spread-Spectrum EconOscillator6 _____________________________________________________________________FREQUENCY % CHANGE vs. SUPPLY VOLTAGE

Pagina 10 - Registers/Commands

DS1087L3.3V Spread-Spectrum EconOscillator_____________________________________________________________________ 7Pin DescriptionPIN NAME FUNCTION1 OUT

Pagina 11 - Application Information

DS1087L3.3V Spread-Spectrum EconOscillator8 _____________________________________________________________________Detailed DescriptionA block diagram o

Pagina 12 - Package Information

DS1087L3.3V Spread-Spectrum EconOscillator_____________________________________________________________________ 9Bits 3 to 0: Prescaler Divider. The p

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Rainbow-electronics DS1087L Manual de usuario

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Indice de contenidos

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