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DS1090U-32 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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DS1090U-32 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 8 page 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-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. Applications Switched-Mode Power Supplies Servers Printers Embedded Microcontrollers Industrial Controls Automotive Applications 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 Low-Frequency, Spread-Spectrum EconOscillator ______________________________________________ Maxim Integrated Products 1 J1 J0 GND 1 2 8 7 JC1 JC0 RSET VCC OUT µSOP TOP VIEW 3 4 6 5 DS1090 Pin Configuration Ordering Information DS1090 VOUT VIN DC-DC STEP-DOWN CONVERTER OUT GND VCC VCC RSET JC0 JC1 J0 J1 45k Ω TO 91k Ω Typical Operating Circuit Rev 0; 4/04 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. Add “/T” for Tape & Reel orders. *Contact factory for availability. PART OUTPUT FREQUENCY RANGE PRESCALER PIN- PACKAGE DS1090U-1 4MHz to 8MHz 18 µSOP DS1090U-2* 2MHz to 4MHz 28 µSOP DS1090U-4* 1MHz to 2MHz 48 µSOP DS1090U-8* 500kHz to 1MHz 88 µSOP DS1090U-16 250kHz to 500kHz 16 8 µSOP DS1090U-32* 125kHz to 250kHz 32 8 µSOP EconOscillator is a trademark of Dallas Semiconductor. |
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