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Epson rolls out low-jitter programmable VCXOs

Posted: 03 Feb 2014 ?? ?Print Version ?Bookmark and Share

Keywords:Epson? VCXO? oscillator? optical transmission?

Seiko Epson Corp. has announced a couple of low-jitter programmable voltage-controlled crystal oscillators (VCXO) that can be programmed from 50-800MHz. According to the firm, the VG7050EAN and VG7050ECN achieve the lowest jitter (0.27ps at 622.08MHz) and lowest power consumption (70mA at 3.3V) of any programmable VCXO in the industry.

Epson's "Any-Rate" programmable VCXOs claim to enable optical transmission equipment to support multiple protocols and line rates with a single oscillator. Earlier equipment used either a single fixed-frequency oscillator that had to be swapped out to change frequencies or multiple fixed-frequency oscillators that increased board space and cost.


Seeking to solve these problems, Epson created the low-jitter low-power programmable VCXOs by combining a highly accurate and stable high-frequency fundamental (HFF) crystal that can oscillate at a fundamental frequency over 100MHz with a low-jitter fractional-n PLL IC. Epson's HFF crystal technology claims to be more reliable than 3rd overtone crystals and achieves better phase noise and jitter than low-frequency fundamental crystals. As a result, Epson's VG7050EAN and VG7050ECN achieve the world's lowest jitter (0.27ps) of any programmable VCXO at both SONET (622.08MHz) and Ethernet (156.25MHz) frequencies, boasted the firm.

Both the VG7050EAN and VG7050ECN are factory programmed for frequency and absolute pull range (APR). The default settings can be overwritten using an I2C bus so users can program any output frequency and APR they require. To simplify multi-protocol designs, the VG7050ECN allows four frequencies to be pin-selectable.

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