DS1090U-1+

MAXIM INTEGRATED PRODUCTS  DS1090U-1+  芯片, 定时器

The is a low-frequency, spread-spectrum EconOscillator in 8 pin µMAX package. It 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 four basic circuit blocks such as resistor-programmed master oscillator, factory-programmed clock prescaler, a pin-programmed dither circuit and the voltage-bias circuit that provides the feedback path to the master oscillator for frequency control and dithering functions. 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 4MHz to 8MHz. Both dither frequency and dither percentage are set using control pins.

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Supply voltage range is 3V to 5.5V

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Operating temperature range from -40°C to 85°C

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Simple user programming

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Dither percentage programmable from 0% to 8%

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Dither rate programmable fMOSC/512, 1024, 2048 or 4096

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CMOS/TTL compatible output

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Prescaler divides the frequency of master oscillator by 1