General Description

The MAX3670 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 MAX3670 integrates a phase/frequency detector, an operational amplifier (op amp), prescaler dividers and input/output buffers. Using an external VCO, the MAX3670 can be configured easily as a phase-lock loop with bandwidth programmable from 15Hz to 20kHz.

Features

♦Single +3.3V or +5.0V Supply

♦Power Dissipation: 150mW at +3.3V Supply

♦External VCO Center Frequencies (fVCO): 155MHz to 670MHz

♦Reference Clock Frequencies: fVCO, fVCO/2, fVCO/8

♦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

Applications

OC-12 to OC-192 SONET/WDM Transport Systems

Clock Jitter Clean-Up and Frequency Synchronization

Frequency Conversion

System Clock Distribution