Low-Frequency, 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, 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

* Embedded Microcontrollers * Industrial Controls * Printers * Servers * Switch-Mode Power Supplies

* 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