MAX3672

Low-Jitter 155MHz/622MHz Clock Generator

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Overview

Single +3.3V or +5.0V Supply
Power Dissipation: 150mW at +3.3V Supply
External VCO Center Frequencies (f_VCO): 155MHz to 700MHz
Reference Clock Frequencies: f_VCO, f_VCO/2, f_VCO/4, f_VCO/8, f_VCO/32
Main Clock Output Frequency: f_VCO
Optional Output Clock Frequencies: f_VCO, f_VCO/2, f_VCO/4, f_VCO/8
Low Intrinsic Jitter: <0.4ps_RMS
Loss-of-Lock Indicator
PECL Clock Output Interface

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