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Ultracompact SPXO rolls for wireless telecoms tech

Posted: 28 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:SPXO? ultracompact oscillators? wireless telecoms?

Epson Toyocom Corp. has announced the commercial development of a new series of simple packaged crystal oscillators (SPXO) for high-stability reference clock applications in WLAN, WiMAX and other wireless telecommunications technologies.

The new SG-211S C series of oscillators boasts a frequency tolerance of 15 x 10-6 within a temperature range of -40C to 85C, providing high stability in a package measuring just 2.5mm x 2mm. Volume production will begin in October 2007.

WLAN, WiMAX and other wireless applications require a reference clock with a maximum frequency tolerance on the order of 20 x 10-6, but obtaining this level of stability over a wide temperature range of -40C to 85C was difficult with conventional SPXOs.

With the SG-211S C series, Epson Toyocom applied temperature-compensated crystal oscillator (TCXO) technology to SPXOs to achieve high stability: frequency tolerance is set at 15 x 10-6 after accounting for power supply fluctuations, load fluctuations and ageing.

Until now, achieving the 20 x 10-6 frequency tolerance required for wireless communications meant either using a TCXO or combining the crystal unit with a complicated crystal oscillation circuit. In contrast, the new series of SPXOs will streamline circuit designs and shorten the time required for circuit evaluations, contributing to greater overall design efficiency.

Moreover, in addition to the 2.5mm x 2mm planar dimensions, the package is ultrathin, the maximum thickness being 0.8mm. The compactness of this SPXO will help enable manufacturers of modules and mobile gear such as cellphones to give their products slimmer, more compact form factors.

The SG-211S C series line-up includes a pair of modelsthe SG-211SDC and the SG-211SCCwhich support different supply voltages for different product specifications.

With these two models, the company offers customers a choice between an SPXO that provides a 20 x 10-6 frequency tolerance and an 15 x 10-6 SPXO that comes with even higher stability and a larger design margin.

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