Home > Products > 266MHz Crystal Oscillator from Maxim delivers Tight Duty-Cycle Performance for DDR Applications

Frequency

266MHz Crystal Oscillator from Maxim delivers Tight Duty-Cycle Performance for DDR Applications

6th March 2009

ES Admin

0 0

Datasheet

Maxim Integrated Products has introduced the DS4266, a 266MHz 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 less than 1psRMS (12kHz to 20MHz) 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 ideal 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 DS4266 is a low-noise, LC PLL-based oscillator that is fabricated using Maxim's proprietary SiGe process. The design of this crystal oscillator incorporates fundamental AT-cut crystal technology, and does not employ an overtone crystal to achieve the high-frequency output. This unique approach eliminates the spurious modes of operation typically found in third-overtone designs, and improves overall stability over SAW-based oscillators (> ±100ppm). The DS4266 provides extremely low aging (< ±7ppm over 10 years) and exceptional total frequency stability (< ±50ppm) with respect to aging, voltage, temperature, loading, and initial tolerance.

The DS4266 supports LVPECL and LVDS output types. This device is fully specified over the -40 degrees Celsius to +85 degrees Celsius extended temperature range, and is available in a space-saving, 5.0mm x 3.2mm x 1.49mm, 10-pin LCCC surface-mount ceramic package. Prices start at $4.50 (10,000-up, FOB USA). Samples are available to speed designs.