Datasheet > DS1090

DS1090

更新时间： 2023-12-20 18:46:29

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亚德诺 - ADI		/
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9页	472K
描述
低频、扩频EconOscillator

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DS1090 数据手册

DS1090

Low-Frequency, Spread-Spectrum EconOscillator

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-radiated

emissions from the power supply at its fundamental

frequency, as well as harmonic frequencies. The device

consists of a resistor-programmed master oscillator, fac-

tory-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 emissions. 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, 2048,

MOSC

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-

PACKAGE

PART

FREQUENCY PRESCALER

RANGE

Applications

● Switched-Mode Power Supplies

● Servers

● Printers

DS1090U-1+

DS1090U-2+

DS1090U-4+

4MHz to 8MHz

2MHz to 4MHz

1MHz to 2MHz

8 µSOP

500kHz to

1MHz

● Embedded Microcontrollers

● Industrial Controls

DS1090U-8+

DS1090U-16+

DS1090U-32+

8 µSOP

250kHz to

500kHz

125kHz to

250kHz

Typical Operating Circuit

Add “T” for Tape & Reel orders.

OUT

Pin Conﬁguration

DC-DC

STEP-DOWN

CONVERTER

TOP VIEW

OUT

JC0

OUT

JC1

JC0

DS1090

JC1

SET

DS1090

SET

45kΩ

TO 91kΩ

GND

µSOP

EconOscillator is a trademark of Maxim Integrated Products, Inc.

19-7500; Rev 3; 9/16

12 3 4 5 6 7...9

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