Silicon replaces crystal in oscillators

01 October 2008

Silicon Labs ( reckons it has developed a silicon oscillator with a wide frequency range from 0.9MHz to 200MHz and of differential and singleended clock formats.

It boasts a low operating voltage of 3.3V, 2.5V and 1.8V and, at 1.5ps RMS phase jitter and 2ps RMS period jitter, it claims to have the industry’s lowest jitter of an oscillator targeted at high volume applications.

The Si500 quartz resonator replaces the quartz resonator with an ultra-low phase noise silicon oscillator manufactured using standard IC manufacturing processes that can generate the output frequencies. Without the mechanical resonator, the oscillator has high immunity to shock and vibration, claims the
company. Oscillators support frequency options from ±100 to ±150ppm, for dropin compatibility with quartz-based oscillators.

The oscillators support a variety of output formats, i.e., CMOS, LVPECL, LVDS, HCSL and SSTL. Dual output CMOS clock oscillators, producing two clocks at the same frequency, are also available. Core power is 8mA, a total supply current is 11mA for LVDS, around 16mA for CMOS and up to 28mA for the LVPECL
version. Current is 17mA at power down. These figures compare favourably, says the company, with CMOS quartz ratings of five to 70mA.

Four or six-pad, 3.2mm x 4mm dual flat no-lead packages are available. Lead times have been reduced to just two weeks.

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