Low-Jitter Crystal-Stabilized Clock Generator with Selectable Multipliers and Dither Magnitudes Reduces EMI
DALLAS, TX-November 30, 2005-Dallas Semiconductor (NASDAQ: MXIM) introduces the DS1080L, a crystal-based clock generator. The DS1080L has an integrated phase-locked loop (PLL) to generate clock outputs and three pin-selectable multiplier rates and three dither magnitudes to reduce EMI. Cycle-to-cycle jitter is a low 75ps. To conserve power, the DS1080L has a spread-spectrum disable mode and a power-down mode.
When used with a low-cost 16MHz to 34.4MHz crystal, the DS1080L can generate 16MHz to 134MHz output frequencies with pin-selectable integer multipliers of 1, 2, and 4. Pin-selectable center-spread dither magnitude choices are 0% (disabled), ±0.5%, ±1.0%, ±1.5%. The spread-spectrum dither rate is fixed at fIN / 1024 to keep the dither rate above the audio frequency range. Using the spread-spectrum DS1080L for the system clock can simplify or eliminate shielding and filtering, thus reducing cost and minimizing design time.
The DS1080L offers 3.0V to 3.6V operation over the automotive temperature range of -40°C to +125°C. It is available in a tiny 8-pin microSOP. Pricing begins at $0.87 (10,000-up, FOB USA).
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