Epson Toyocom Develops Ultra-Accurate, High-Stability TCXO

Epson Toyocom Develops Ultra-Accurate, High-Stability TCXO
New TG-5500CA provides OCXO-class frequency/temperature coefficient

Epson Toyocom Corporation, the leader in crystal devices, today announced the development of a highly accurate new TCXO (temperature-compensated crystal oscillator) that has an OCXO-class frequency/temperature coefficient of ±0.1 x 10-6, enabling power and space saving in network equipment.

Samples of the new TG-5500CA oscillator will become available in December 2009. Commercial development is scheduled for March 2010.

Reference clocks used in ultra-compact cellular base stations for home and office use require high accuracy, with a frequency/temperature coefficient of ±0.1 x 10-6 or better. Core network equipment, meanwhile, requires stability of ±4.6 x 10-6 over a period of 20 years. Obtaining this class of frequency tolerance/stability normally requires the use of a highly stable oscillator in the OCXO (oven-controlled crystal oscillator) or atomic oscillator classes.

The TG-5500CA, in addition to being equipped with a QMEMS*1 crystal unit, has an original structural design that takes into account thermal conductivity and that stabilizes the frequency/temperature coefficient and long-term ageing characteristics.
Frequency-stability characteristics that affect the quality of transmissions, such as temperature tracking*2.and frequency fluctuation*3, have also been dramatically improved compared to Epson Toyocom’s conventional 7.0 x 5.0 mm TCXO (Figure 2).

The improvement enabled frequency tolerance/stability that is one rank above that of current TCXOs. The TG-5500CA can thus be used in applications that were formerly reserved for OCXO-range devices. Using a TCXO instead of an OCXO can significantly help reduce the power consumption and size of systems. The TG-5500CA can also be used to improve the performance and function of systems that employ an existing TCXO, but it is exceptionally well-suited for use in core network equipment, such as femtocell*4 base stations and Stratum 3*5 products.

Main features
1.Ultra-high stability, with a frequency/temperature coefficient of ±0.1 x 10-6
2.Excellent hysteresis characteristics
3.Long-term frequency ageing characteristics (±3.0 x 10-6 over 20 years) meet Stratum 3 requirements
4.Good temperature tracking and minimal frequency fluctuation

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