General Description

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.

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

Applications

    LCD Panels for TVs, Desktop Monitors, and Notebook and Tablet PCs

    Automotive Telematics and Infotainment

    Printers