General Description

The MAX3629 is a low-jitter precision clock generator optimized for network applications. The device integrates a crystal oscillator and a phase-locked loop (PLL) to generate high-frequency clock outputs for Ethernet applications.

Maxim’s proprietary PLL design features ultra-low jitter (0.4psRMS) and excellent power-supply noise rejection (PSNR), minimizing design risk for network equipment.

The MAX3629 contains five LVDS outputs and three LVCMOS outputs. The output frequencies are selectable among 125MHz, 156.25MHz, and 312.5MHz by pin control.

Features

♦ Crystal Oscillator Interface: 25MHz

♦ OSC_IN Interface:

   PLL Enabled: 25MHz

   PLL Disabled: 20MHz to 320MHz

♦ Outputs:

   One LVDS Output at 125MHz/156.25MHz/

      312.5MHz (Selectable with FSELA)

   Four LVDS Outputs at 125MHz/156.25MHz/

      312.5MHz (Selectable with FSELB)

   Three LVCMOS Outputs at 125MHz/156.25MHz

      (Selectable with FSELB)

♦ Low Phase Jitter: 0.4psRMS (12kHz to 20MHz)

♦ Excellent PSNR

♦ Operating Temperature Range: 0°C to +70°C

Applications

   Ethernet Networking Equipment