General Description
The VSC8121 is a monolithic Phase Locked Loop (PLL) based clock generator designed for telecommunications systems operating at 2.5Gb/s. The VSC8121 incorporates a reactance-based (LC) Voltage Controlled Oscillator (VCO) with low phase noise. The PLL’s loop filter is on-chip.
   
Features
• Monolithic Phase Locked Loop
• On-Chip LC Oscillator
• On-Chip Loop Filter
• TTL/CMOS Reference Clock
• Selectable Reference
• Jitter Meets SONET OC-48 and
    SDH STM-16 Requirements
• High-Speed CML Clock Output
• Single 3.3V Supply
• Compact 10mm x 10mm 44 Pin PQFP Package