Electronic Design

Next-Gen Synthesizers Enhance Jitter, Noise Performance

The latest series in the FemtoClocks family of frequency synthesizers is the FemtoClock Next Generation, which feature very low phase noise and significantly improved power-supply noise rejection. The new FemtoClocks are fully customizable, standalone solutions that generate reference frequencies, allowing them to replace crystal and SAW oscillators in high-performance applications. The first device in this family, the 843N156-125, generates a 125-MHz single-ended output and a 156.25-MHz LVPECL output from one 25-MHz crystal, replacing two crystal oscillators on the board with one device. The typical rms phase-noise jitter for both frequencies is 400 fS, which is well within the margins of the jitter requirements of PCIe, Gigabit Ethernet, and 10-Gigabit Ethernet applications. Additional FemtoClock NG members will feature output frequencies up to 1.3 GHz. The new synthesizer comes in a 16-lead TSSOP. It is sampling now to qualified customers. The 843N156-125 costs $4.81 in quantities of 1000. INTEGRATED DEVICE TECHNOLOGY INC., San Jose, CA. (408) 398-9700.



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