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DS1090

Low-Frequency, Spread-Spectrum EconOscillator

Maxim Integrated 

DS1090

Low-Frequency, Spread-Spectrum EconOscillator

General Description

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.

Applications

●● Switched-Mode Power Supplies

●● Servers

●● Printers

●● Embedded Microcontrollers

●● Industrial Controls

Typical Operating Circuit

VIN

VOUT

45kΩ

TO 91kΩ

VCC

VCC OUT

JC0

DS1090 JC1

RSET

J0

J1

GND

DC-DC

STEP-DOWN

CONVERTER

EconOscillator is a trademark of Maxim Integrated Products, Inc.

Features

●● Low-Cost, Spread-Spectrum EconOscillator™

●● Simple User Programming

●● Output Frequency Programmable from 125kHz to 8MHz

●● Dither Percentage Programmable from 0% to 8%

●● Dither Rate Programmable (fMOSC/512, 1024, 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

PART

DS1090U-1+

DS1090U-2+

DS1090U-4+

DS1090U-8+

DS1090U-16+

DS1090U-32+

OUTPUT

FREQUENCY

RANGE

4MHz to 8MHz

2MHz to 4MHz

1MHz to 2MHz

500kHz to

1MHz

250kHz to

500kHz

125kHz to

250kHz

PRESCALER

1

2

4

8

16

32

PIN-

PACKAGE

8 µSOP

8 µSOP

8 µSOP

8 µSOP

8 µSOP

8 µSOP

Add “T” for Tape & Reel orders.

Pin Configuration

TOP VIEW

OUT 1

RSET 2

VCC 3

GND 4

DS1090

µSOP

8 JC1

7 JC0

6 J1

5 J0

19-7500; Rev 3; 9/16

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