Datasheet > DS1090_07

DS1090_07

更新时间： 2022-10-27 11:38:18

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描述
Low-Frequency, Spread-Spectrum EconOscillator

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数据手册

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DS1090_07 数据手册

Rev 1; 2/07

Low-Frequency, Spread-Spectrum

EconOscillator

DS190

General Description

Features

♦ Low-Cost, Spread-Spectrum EconOscillator™

The DS1090 is a low-cost, dithered oscillator intended

to be used as an external clock for switched-mode

power supplies and other low-frequency applications.

The dithering or sweeping function reduces peak-radi-

ated emissions from the power supply at its fundamen-

tal frequency, as well as harmonic frequencies. The

device consists of a resistor-programmed master oscil-

lator, factory-programmed clock prescaler, and a pin-

programmed dither circuit. These features allow the

DS1090 to be used in applications where a spread-

spectrum clock is desired to reduce radiated emis-

sions. A combination of factory-set prescalers and

external resistor allows for output frequencies ranging

from 125kHz to 8MHz. Both dither frequency and dither

percentage are set using control pins.

♦ Simple User Programming

♦ Output Frequency Programmable from 125kHz

to 8MHz

♦ Dither Percentage Programmable from 0% to 8%

♦ Dither Rate Programmable (f

/ 512, 1024,

MOSC

2048, or 4096 )

♦ 3.0V to 5.5V Single-Supply Operation

♦ CMOS/TTL-Compatible Output

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

Ordering Information

OUTPUT

PIN-

PART

FREQUENCY

RANGE

PRESCALER

PACKAGE

Applications

Switched-Mode Power Supplies

DS1090U-1+

DS1090U-2+

DS1090U-4+

4MHz to 8MHz

2MHz to 4MHz

1MHz to 2MHz

8 μSOP

Servers

500kHz to

1MHz

Printers

DS1090U-8+

DS1090U-16+

DS1090U-32+

8 μSOP

Embedded Microcontrollers

Industrial Controls

Automotive Applications

250kHz to

500kHz

125kHz to

250kHz

Add “T” for Tape & Reel orders.

Pin Configuration

Typical Operating Circuit

OUT

TOP VIEW

DC-DC

STEP-DOWN

CONVERTER

OUT

JC1

JC0

SET

OUT

JC0

DS1090

JC1

DS1090

GND

SET

45kΩ

TO 91kΩ

μSOP

EconOscillator is a trademark of Dallas Semiconductor.

______________________________________________ Maxim Integrated Products

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.

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