Crystal Oscillator Delivers Tight Duty-Cycle Performance for DDR Applications
Maxim Integrated Products introduces the DS4266, a 266 MHz clock oscillator specifically designed for DDR memory applications. This device guarantees an extremely tight duty-cycle output of 48%/52%, and delivers RMS jitter of <1psRMS (12 kHz to 20 MHz) and cycle-to-cycle jitter of ±7.5ps (typ). It thus increases system-timing margins and enables an extremely low bit-error rate (BER) during data transfer at very high speeds. The DS4266's superb duty-cycle and jitter performance make it suited for the most demanding DDR memory applications. The DS4266 boasts a 55% smaller footprint than traditional SAW-based and third-overtone crystal oscillator designs, which generally are not specified for duty cycles better than 48%/52%. The device is a low-noise, LC PLL-based oscillator that is fabricated using Maxim's proprietary SiGe process.