The MM8511 is a fully-integrated frequency source for Spread Spectrum Clocking applications. Powered by Mobius Microsystems’ patented CMOS Harmonic Oscillator technology, the MM8511 replaces both the quartz crystal and the PLL ICs with a monolithic CMOS die. The elimination of the quartz crystal improves reliability, removes bulky packages from the system and lowers BOM count. The elimination of the PLL improves performance by reducing clock jitter, and lowering phase noise and power consumption. Spread Spectrum Clocking, commonly referred to as SSCG reduces peak EMI emissions by modulating the frequency source with a pre-determined rate so that the energy of the signal is spread over a wide spectral band, thus allowing for peak energy to be reduced.

• All-CMOS temperature compensated harmonic oscillator (CHO™)
• Spread Spectrum Clock Generator
• No External crystal reference or PLL IC required
• Ultra-low EMI emissions
• Excellent phase noise and jitter
• Low power dissipation
• Programmable output frequency: 10-66MHz
• Programmable Spread Spectrum profiles: 0.25-6% modulation
• Center- and down-spread options available
• 3.3V CMOS output
• Operating Temperature: 0 to 70°C
• Small surface mount 8-DFN and TSSOP packages