Jitter Cleaners/Network Synchronizers

The Cascade™ family of jitter cleaners and network synchronizers deliver a clock-system-on-a-chip by consolidating multiple clock ICs and oscillators into a single device for IEEE 1588, synchronized Ethernet (syncE) and high-speed SerDes. These MEMS clocks integrate SiTime’s third generation MEMS resonator and eliminate the dependency on quartz, along with all quartz related issues.

This integrated MEMS approach, combined with low noise and a feature-rich PLL IC, enable more robust system timing for high reliability systems. Benefits include guaranteed jitter that is not susceptible to noise coupling associated with crystal circuitry, always-accurate frequency synthesis without crystal capacitive mismatching, 10 times more vibration resistant, always-reliable startup in harsh environments, and fast hitless switching to ensure redundancy.

Jitter Cleaners

The Cascade MEMS jitter cleaner features 4 Frac-N PLLs with an integrated VCO and loop filter, flexible input-to-output frequency translation from 1 input to 10 outputs, wide frequency range from 8 kHz to 2.1 GHz, and a rich set of programmable features in a small 9 x 9 mm package. By integrating the MEMS resonator, these devices enable designers to create a clock-system-on-a-chip and eliminate all quality and reliability issues associated with traditional quartz-based clocks.

  • Always-accurate clock synthesis by eliminating crystal capacitive mismatch
  • Always-reliable startup even at cold temperature and other harsh environmental conditions
  • No jitter degradation because of noise coupling onto a crystal interface
  • No activity dips/frequency jumps inherent to quartz
  • 10x more resistant to vibration and board bending
Device Datasheet Number of Inputs Number of Outputs Max. Output Frequency Number of PLL/Clock Domains Phase Jitter(rms) Package(mm)
SiT95145 4 10 2.1 GHz 4 PLL 1 time domain 120 fs 9x9 mm, 64-pin

Network Synchronizers

The Cascade MEMS network synchronizers features 4 independent time domains, 1 mHz to 4 kHz programmable loop bandwidth and DCO mode with 50-ppt resolution to frequency, and phase recovery from syncE and IEEE 1588. These devices also come with 4 Frac-N PLLs with an integrated VCO and loop filter, flexible input (4) to output (up to 11) frequency translation, wide frequency range from 8 kHz to 2.1 GHz, and a rich set of programmable features in a small 9 x 9 mm package. By integrating the MEMS resonator, these devices enable designers to create a clock-system-on-a-chip and eliminate all quality and reliability issues associated with traditional quartz-based clocks.

  • Always-accurate clock synthesis by eliminating crystal capacitive mismatch
  • Always-reliable startup even at cold temperature and other harsh environmental conditions
  • No jitter degradation due to noise coupling onto a crystal interface
  • No activity dips/frequency jumps inherent to quartz
  • 10x more resistant to vibration and board bending
Device Datasheet Number of Inputs Number of Outputs Max. Output Frequency Number of PLL/Clock Domains Phase Jitter(rms) Package(mm)
SiT95147 4 8 2.1 GHz 4 PLLs 4 time domains 120 fs 9x9 mm, 64-pin
SiT95148 4 11 2.1 GHz 4 PLLs 4 time domains 120 fs 9x9 mm, 64-pin