General Description

The MAX3624A is a low-jitter, precision clock generator optimized for networking applications. The device integrates a crystal oscillator and a phase-locked loop (PLL) clock multiplier to generate high-frequency clock outputs for Ethernet, Fibre Channel, SONET/SDH, and other networking applications.

Maxim’s proprietary PLL design features ultra-low jitter (0.36psRMS) and excellent power-supply noise rejection, minimizing design risk for network equipment.

The MAX3624A has three LVPECL outputs and one LVCMOS output. Selectable output dividers and a selectable feedback divider allow a range of output frequencies.

Features

♦ Crystal Oscillator Interface: 19.375MHz to 27MHz

♦ CMOS Input: 19MHz to 40.5MHz

♦ Output Frequencies

   Ethernet: 62.5MHz, 125MHz, 156.25MHz,

      312.5MHz

   Fibre Channel: 106.25MHz, 159.375MHz,

      212.5MHz, 318.5MHz

   SONET/SDH: 77.76MHz, 155.52MHz, 311.04MHz

♦ Low Jitter

   0.14psRMS (1.875MHz to 20MHz)

   0.36psRMS (12kHz to 20MHz)

♦ Excellent Power-Supply Noise Rejection

♦ No External Loop Filter Capacitor Required

Applications

   Ethernet Networking Equipment

   Fibre Channel Storage Area Network

   SONET/SDH Network