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MAX3629
+3.3V, Low-Jitter, Precision Clock Generator with Multiple Outputs

Generates All Ethernet Frequencies with Multiple Outputs Using a Low-Frequency Crystal


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Status
Active: In Production.

Description
FULL DATA SHEET (PDF, 540kB)
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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.

Key Features   Applications/Uses
  • 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
 
  • Ethernet Networking Equipment

Key Specifications:  Clock Generators
Part Number Applications fIN
(MHz)
fIN
(MHz)
fOUT
(MHz)
fOUT
(MHz)
Fixed or Continuous Frequency Output Levels Out-
puts
PLLs Spread Spectrum Output Jitter
(ps)
VSUPPLY
(V)
Package/Pins Price
min max min max RMS See Notes
MAX3629  Ethernet 25 25 125 312.5 Fixed
LVCMOS
LVDS
8 1 No 0.4 3.3
TQFN/32
$9.14 @1k
See All Clock Generators (25)

Diagram
MAX3629: Typical Operating Circuit
Typical Operating Circuit

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    Document Ref.: 19-4467; Rev 0; 2009-02-10
    This page last modified: 2009-07-08


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