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SiTime uses dual MEMS for network oscillators

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By Peter Clarke


The Elite range offers frequencies from 1MHz up to 700MHz and a frequency stability of ±100 ppb frequency stability over -40°C to +105°C. Members of the family are suitable for timing duties in small cell equipment, microwave backhaul, synchronous Ethernet and optical equipment.

It improves reliability of 10/40/100G Ethernet and in-system programmability (ISP) provides multiprotocol support and improves system BOM.

In the past SiTime has enjoyed success providing MEMS timing devices into consumer applications at low cost and high accuracy. As a result has shipped more than 500 million units since its formation and it expects to double unit deliveries in 2016 compared with 2015, said Piyush Sevalia, executive vice president of marketing. Now the company is using benefits of research to go after stricter stability requirements in networking and professional equipment using a DualMEMS architecture with TurboCompensation.

This architecture essentially uses dual resonator MEMS structures to compensate for temperature. And because of silicon integration the devices provide a number of additional circuits in the same component package. These include on-chip regulators, a TDC (temperature to digital converter) and a low-noise PLL that deliver 5 times better immunity to power-supply noise, 30 microK temperature resolution that is 10 times better than quartz, and optional I2C interface.

“Network densification is driving rapid deployment of equipment in uncontrolled environments such as basements, curbsides, rooftops, and on poles. Precision timing components in these systems must now operate in the presence of high temperature, thermal shock, vibration and unpredictable airflow. Service providers are questioning if quartz technology is up to this challenge,” said Rajesh Vashist, CEO at SiTime, in a statement.

Engineering samples of the Elite-based ultra-low jitter differential oscillators and high-temperature VCXOs are available to qualified customers now. Samples of Elite-based Super-TCXOs are expected to be available in the first half of 2017. Pricing is expected to be in the $10 to $15 range.

Related links and articles:

www.sitime.com

News articles:

SiTime refines MEMS-based kHz oscillator

Japan’s MegaChips to buy MEMS maker SiTime

Time for a change: Quartz oscillators make way for MEMS


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