Spread-Spectrum Clock Modulator for LCD Panels

Low-Jitter, Spread-Spectrum Clock Modulators Reduce EMI in Large-Format LCD Panels

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The DS1081L is a spread-spectrum clock modulator IC that reduces EMI in high clock-frequency-based, digital electronic equipment.

Using an integrated phase-locked loop (PLL), the DS1081L accepts an input clock signal in the range of 20MHz to 134MHz and delivers a spread-spectrum modulated output clock signal. The PLL modulates, or dithers, the output clock about the center input frequency at a pin-selectable magnitude and dither rate, allowing direct EMI control and optimization. In addition, through an enable pin the dithering can be enabled or disabled for easy comparison of system performance during EMI testing. This same input pin also allows the DS1081L output to be three-stated.

By dithering the system clock, all the address, data, and timing signals generated from this signal are also dithered so that the measured EMI at the fundamental and harmonic frequencies is greatly reduced. This is accomplished without changing clock rise/fall times or adding the space, weight, design time, and cost associated with mechanical shielding.

The DS1081L is provided in an 8-pin TSSOP package and operates over a full automotive temperature range of -40°C to +125°C.
DS1081L: Block Diagram DS1081L: Block Diagram Enlarge+

Key Features

  • Modulates a 20MHz to 134MHz Clock with Center Spread-Spectrum Dithering
  • Selectable Spread-Spectrum Modulation Magnitudes of:
    • ±0.5%
    • ±1.0%
    • ±1.5%
    • ±2.0%
  • Low 75ps Cycle-to-Cycle Jitter
  • Spread-Spectrum Disable Mode
  • Pin Compatible with Alliance/PulseCore Semiconductor P2040 Series Devices
  • Clock Output Disable
  • Low Power Consumption
  • 3.3V Single Voltage Supply
  • -40°C to +125°C Temperature Range
  • Small 8-Pin TSSOP Package


  • Automotive Telematics and Infotainment
  • LCD Panels for TVs, Desktop Monitors, and Notebook and Tablet PCs
  • Printers
Product Reliability Reports: DS1081L.pdf 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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