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DS1090

Part Number	DS1090
Manufacturer	Maxim Integrated Products
Description	Spread-Spectrum EconOscillator
Published	Nov 15, 2006
Detailed Description	DS1090 Low-Frequency, Spread-Spectrum EconOscillator General Description The DS1090 is a low-cost, dithered oscillator...
Datasheet	DS1090 PDF File

Overview

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, 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 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 45kΩ TO 91kΩ VCC VCC OUT JC0 DS1090 JC1 RSET J0 J1 GND DC-DC STEP-DOWN CONVERTER VOUT EconOscillator is a trademark of Maxim Integrated Products, Inc.
Features ●● Low-Cost, Spread-Spectrum EconOscillator™ ●● Simple User Programming ●● O utput 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 OUTPUT FREQUENCY RANGE DS1090U-1+ DS1090U-2+ DS1090U-4+ 4MHz to 8MHz 2MHz to 4MHz 1MHz to 2MHz DS1090U-8+ 500kHz to 1MHz DS1090U-16+ 250kHz to 500kHz DS1090U-32+ 125kHz to 250kHz Add “T” for Tape & Reel orders.
PRESCALER 1 2 4 8 16 32 PINPACKAGE 8 µSOP 8 µSOP 8 µSOP 8 µSOP 8 µSOP 8 µSOP 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 DS1090 Low-Frequency, Spread-S...

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