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.
Key Features
Applications/Uses
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)
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
Devices:
1-17 of 17
DS1090
Notes
Free Sample
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Status
Package:
TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
Temp
RoHS/Lead-Free? Materials Analysis
DS1090U-2
Resistor Prog. 2MHz to 4MHz, 3V to 5.5V
Active
µMAX;8 pin;16 mm²
Outline Drawing: 21-0036 (PDF)
Land Pattern: 90-0092 (PDF)
Use pkgcode/variation: U8-1*
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