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Low-Frequency, Spread-Spectrum EconOscillator

Industry's Only Spread-Spectrum Resistor-Programmable Oscillator

Product Details

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

  • 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

Applications/Uses

  • Embedded Microcontrollers
  • Industrial Controls
  • Printers
  • Servers
  • Switch-Mode Power Supplies
Parametric specs for Silicon Oscillators
fOUT (MHz) (max) 8
Spread Spectrum Yes
fOUT (kHz) (min) 125
ΔfOUT (%) (max) ±2.5 (-40 to +85°C)
User Prog. fOUT External Resistors
VCC (V) 3.0 to 5.5
Reset Out No
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/8
Budgetary
Price (See Notes)
$0.87 @1k
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Simplified Block Diagram

DS1090: Typical Operating Circuit DS1090: Typical Operating Circuit Zoom icon

Design & Development

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Parameters

Parametric specs for Silicon Oscillators
fOUT (MHz) (max) 8
Spread Spectrum Yes
fOUT (kHz) (min) 125
ΔfOUT (%) (max) ±2.5 (-40 to +85°C)
User Prog. fOUT External Resistors
VCC (V) 3.0 to 5.5
Reset Out No
Oper. Temp. (°C) -40 to +85
Package/Pins UMAX/8
Budgetary
Price (See Notes)
$0.87 @1k

Key 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

Applications/Uses

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

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 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.

Simplified Block Diagram

DS1090: Typical Operating Circuit DS1090: Typical Operating Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal