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