DS1090 Datasheet | Maxim Integrated

Low-Frequency, Spread-Spectrum Econ Oscillator 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 bination of factory-set prescalers and external resistor allows for output frequencies ranging from 125k Hz 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 45kΩ TO 91kΩ VCC OUT JC0 DS1090 JC1 RSET J0 J1 GND DC-DC STEP-DOWN CONVERTER VOUT Econ Oscillator is a trademark of Maxim Integrated Products, Inc. Features - - Low-Cost, Spread-Spectrum Econ Oscillator™ - - Simple User Programming - - O utput Frequency Programmable from 125k Hz to 8MHz - - Dither Percentage Programmable from 0% to 8% - - Dither Rate Programmable (f MOSC/512, 1024, 2048, or 4096) - - 3.0V to 5.5V Single-Supply Operation - - CMOS/TTL-patible Output - - Operating Temperature Range: -40°C to +85°C Ordering...