SOURCE: Epson Toyocom Corp.

September 21, 2009 10:41 ET

US-Based Epson Toyocom Timing Products Division Brings World's First High-Stability Saw Oscillator With Frequency/Temperature Coefficients That Challenge Crystal Counterparts

New Line Affords Performance at Unprecedented Levels

EL SEGUNDO, CA--(Marketwire - September 21, 2009) - Epson Toyocom Corporation's U.S.-based Timing Products Division today announced that it has achieved the world's first SAW resonator with a frequency/temperature coefficient that is represented by a cubic curve (Figure 1). The EG-4101/4121CA from Epson incorporates this completely new category of resonator; high-frequency, low jitter(*1) and low phase noise(*2) SAW oscillators that provide outstanding frequency stability over a wide temperature range. These new SAW oscillators employ a unique and patented quartz SAW cut, with unmatched frequency-temperature stability, best-in-class phase-noise performance, and absence of frequency jumping, providing clock solutions of unprecedented performance. Samples will be available in December 2009 with production units scheduled for the second quarter of 2010.

With each new market application, the amount of heat generated within electronic equipment has increased, not only because of the higher reference clock frequencies needed to support faster transmission speeds, but also because of the diminishing size of equipment enclosures, as epitomized by blade servers. Higher internal temperatures require a heightened need for electronic devices that operate over larger temperature ranges and at higher stability. Also in demand are electronic devices that provide stable operation for extended periods in environments subject to hot and cold temperature extremes, such as outdoor wireless base stations. Anticipating these conditions, Epson leveraged its original SAW design approach to develop a SAW oscillator for LAN(*3) and SAN(*4) equipment with high-speed interfaces.

The EG-4101/4121CA also helps to further increase system reliability and quality in server/network devices and wireless communications applications requiring a highly stable, high-frequency clock with low jitter and low phase noise and requiring operation over a wider temperature range.

There are two ways to obtain a high-frequency reference clock signal. One way is to use a SAW oscillator at a high-frequency fundamental mode between 100 and 700 MHz to achieve outstanding jitter and phase noise characteristics. The other way is to multiply the signal of an AT oscillator with a circuit, resulting in exceptional temperature characteristics but increased jitter and phase noise.

Until now, SAW resonators having temperature characteristics that are represented by a quadratic curve have not had a frequency/temperature coefficient as good as that of AT crystal units having cubic curve coefficients. Epson Toyocom's efforts have resulted in this new line of SAW oscillator with an improved frequency/temperature coefficient that boasts outstanding jitter and phase noise characteristics as well as a frequency/temperature coefficient that is equal to or better than that of an AT oscillator.

Main Features

1)  High stability (frequency tolerance of +/-50 x 10-6) provided by Epson
    Toyocom's proprietary high-stability SAW resonator (+/-25 x 10-6 or
    better is planned)
2)  Supports a wide operating temperature range of -40 °C to +85 °C
    (standard) or -40 °C to +90 °C (option)
3)  Low-phase noise and low jitter due to oscillation at the crystal's
    fundamental frequency
4)  Supports multiple output load conditions (differential LV-PECL,
    LVDS, HCSL)
5)  Thin design (thickness: 1.2 mm)

Main specifications

Item                                           Specification
                                -------------------------------------------
Output load condition             LV-PECL         LVDS           HCSL
                                -------------------------------------------
Output frequency range             100 MHz to 700 MHz    100 MHz to 500 MHz
                                -------------------------------------------
Operating temperature range     -40 °C to +85 °C (standard) / -40 °C to +90
                                                              (C (option)
                                -------------------------------------------
Storage temperature range                  -55 °C to +125 °C
                                -------------------------------------------
Supply voltage                         2.5 +/-0.125 V / 3.3 +/-0.33 V
                                -------------------------------------------
Current consumption                100 mA Max.   30 mA Max.   80 mA Max.
                                  / 80 mA Max. / 45 mA Max. / 75 mA Max.
                                -------------------------------------------
Frequency tolerance                            +/-50x10(-6)
                                -------------------------------------------
Phase jitter                    0.2 ps Max. (@622.08 MHz, 12 kHz to 20 MHz)
                                -------------------------------------------
External dimensions                         7.0 x 5.0 x 1.2t mm
                                -------------------------------------------

Glossary

(*1) Jitter

Fluctuation among clock cycles, which can cause jittery images or bit errors during data transfers.

(*2) Phase noise

Energy that is radiated near the oscillation frequency, that occurs due to the internal and external environmental factors (noise) of a crystal oscillation circuit. Wireless signal transmission errors can occur when this noise value is too high.

(*3) LAN (local area network)

A network that interconnects computers and peripherals within a small geographic area, such as an office or building, and that is used for sharing information and for intercommunications. LANS are typically based on the Ethernet standard and transmission rates have accelerated in recent years.

(*4) SAN (storage area network)

A network that connects remote storage devices to servers. Capable of storing and handling large volumes of data, these systems most often utilize the Fibre Channel standard.

About Epson Toyocom

Epson Toyocom Corporation is the global leader in crystal devices, which serve as the heart and pulse for a wide range of electronic products for consumers and industry. Utilizing its innovative hybrid quartz microfabrication technology, QMEMS, Epson Toyocom offers technological expertise in timing, sensing, and optical devices, and maintains its leadership position by providing customer-specific combinations and solutions. http://www.epsontoyocom.co.jp/english/

About Epson Electronics America, Inc.

The Timing Products Business Unit of Epson Electronics America, Inc. (EEA) is the North American sales, marketing, and engineering arm of Epson Toyocom Corporation (Epson Toyocom) and provides a wide array of crystals, oscillators, real-time clock modules, SAW products, optical devices and gyro and pressure sensors. Based in El Segundo, California, the EEA group has more than 40 sales representative offices nationwide and a growing network of exclusive distributors. For more information, please visit www.eea.epson.com and click on the Epson Toyocom center box. Both Epson Toyocom and EEA are part of the Seiko Epson Group, which consists of 108 companies around the world.

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