Low-Jitter 155MHz/622MHz Clock Generator

The MAX3672 is a low-jitter 155MHz/622MHz reference clock generator IC designed for system clock distribution and frequency synchronization in OC-48 and OC-192 SONET/SDH and WDM transmission systems. The MAX3672 integrates a phase/frequency detector, an operational amplifier (op amp), prescaler dividers, and input/output buffers. Using an external VCO, the MAX3672 can be configured easily as a phase-lock loop with bandwidth programmable from 30Hz to 10kHz.

The MAX3672 operates from a single +3.3V or +5.0V supply and dissipates 150mW (typ) at 3.3V. The operating temperature range is -40°C to +85°C.

Applications

* Clock Jitter Clean-Up and Frequency Synchronization * Frequency Conversion * OC-12 to OC-192 SONET/WDM Transport Systems * System Clock Distribution

* Single +3.3V or +5.0V Supply

* Power Dissipation: 150mW at +3.3V Supply

* External VCO Center Frequencies (fVCO): 155MHz to 700MHz

* Reference Clock Frequencies: fVCO, fVCO/2, fVCO/4, fVCO/8, fVCO/32

* Main Clock Output Frequency: fVCO

* Optional Output Clock Frequencies: fVCO, fVCO/2, fVCO/4, fVCO/8

* Low Intrinsic Jitter: <0.4psRMS

* Loss-of-Lock Indicator

* PECL Clock Output Interface