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MEMS oscillator smaller than VCXOs

Posted: 02 Apr 2009     Print Version  Bookmark and Share

Keywords:crystal oscillators  timing chips  MEMS oscillator  VCXO 

Most timing chips are designed to remain steady, but voltage-controlled crystal oscillators (VCXOs) tune their precise frequency in response to data stream variations. SiTime Corp., a maker of MEMS timing chips, is claiming to have a smaller solution called a voltage-controlled MEMS oscillator (VCMO).

The current VCXO market includes chips used in STBs, consumer and networked video, modems, data acquisition equipment and for instrumentation. They make up a Rs.1,809.78 crore ($364 million) market, according to an ABI Research survey. For comparison, the entire timing chip market is over Rs.24,859.60 crore ($5 billion).

SiTime said the frequency of its VCMO can be adjusted by a few per cent to lock onto the slightly varying timing of signals in video and other communications data streams. SiTime also claims its VCMO is smaller than VCXOs, which are typically enclosed in 3mm x 3mm packages. SiTime's VCMO—the SiT3701—measures just 2.5mm x 2mm.

SiTime stacked its MEMS die atop an ASIC housing its programmable PLL, which can vary output frequency of the 1MHz to 110MHz oscillator within four pull ranges: ±30, 60, 120 or 240 parts per million.

Output frequency and pull ranges are programmed by SiTime 24hrs after receiving orders for samples, followed by volume shipments within two weeks.

- R. Colin Johnson
EE Times

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