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Epson Toyocom Bolsters its Lineup of Compact, Stable, High-Frequency HFF Crystal Oscillators for Telecommunications Networks


Epson Toyocom Corporation (“Epson Toyocom”), the leader in crystal devices, has announced the commercial development of two new models of highly accurate, miniature, high-frequency fundamental mode (HFF) crystal oscillators for high-frequency applications in optical transmission devices, cellular base stations, WiMAX base stations and other core network equipment. The new HFF crystal oscillators, the VG-4511CA and the SG-771PCD series, will enter volume production in April 2008.

Communications network equipment providers require increasingly demanding performance from frequency-stable, high-frequency crystal oscillators in order to assure communications reliability and to support higher bandwidths and transmission speeds, even as the need for smaller, space-saving devices accelerates.

Epson Toyocom has been using QMEMS(*1) fabrication technology to provide HFF crystal oscillators having a crystal unit with a proprietary inverted-mesa structure. This structure, wherein only a portion of the resonator near an excitation electrode is thinned, enables higher stability and higher frequency. In addition to offering enhanced performance, the new HFF crystal oscillators were made a compact 7.0 x 5.0 x 1.6t mm by adopting a single-sealed structure(*3) instead of the conventional double-sealed structure. Meanwhile, ageing characteristics were improved by using wire bonding to bond the crystal chip and package.

To meet market needs for a wider selection of devices for a wider range of transmission equipment and base station specifications, Epson Toyocom is beefing up its lineup with the SG-771PCD crystal oscillators and the VG-4511CA series of frequency-adjustable voltage-controlled crystal oscillators (VCXOs).

The next-generation network(*4) market is expected to further expand, and Epson Toyocom plans to meet the needs of this market by leveraging its QMEMS fabrication and other technologies to continue developing and commercializing space-saving, high-frequency crystal devices that offer precision and stability advantages.

Main features
* Supports frequencies up to 170 MHz
* Low-phase noise(*5) and low jitter(*6) at the crystal’s fundamental oscillation frequency
* Superior ageing and humidity-resistance characteristics
* Small package dimensions of just 7.0 x 5.0 x 1.6t mm


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