SiTime TCXO 0.5 PPM Frequency Stability
Certain applications such as wireless, GPS and wireline infrastructure, require very tight frequency stability of 0.1 to 5 PPM over temperature. These applications have been traditionally serviced by quartz TCXOs (temperature compensated oscillators) hat are specially calibrated to meet these tight specifications. SiTime offers MEMS TCXOs that replace quartz TCXOs without any board layout changes. The graph below shows the measured frequency stability of a 0.5 PPM SiTime TCXO that operates over the industrial temperature range.
SiTime XO Frequency Stability
The frequency variation of standard AT cut quartz crystal oscillators is shown below, along with the stability of typical MEMS oscillators from SiTime. Since SiTime's revolutionary MEMS oscillators have built-in temperature compensation, these devices exhibit very flat frequency stability over the entire industrial temperature range, with adequate margin at the low and high temperatures to meet the specifications of high performance applications.
SiTime offers a 10 PPM XO, as shown in the plot below, which quartz companies cannot offer. In fact, SiTime's 10-25 PPM XOs outperform quartz, SAW, and overtone oscillators at frequencies above 70 MHz. This is another fundamental change that SiTime is bringing to the timing market.
SiTime also offers 25 PPM XOs, as shown in the plot below, that have better frequency stability characteristics compared to quartz 25 PPM XOs.