QuickView - MAX3679 +3.3V, Low-Jitter Crystal to LVPECL Clock Generator

Description

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The MAX3679 is a low-jitter precision clock generator with the integration of three LVPECL and one LVCMOS outputs optimized for Ethernet applications. The device integrates a crystal oscillator and a phase-locked loop (PLL) clock multiplier to generate high-frequency clock outputs for Ethernet applications.

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

Key Features

Applications/Uses

Crystal Oscillator Interface: 25MHz
CMOS Input: 25MHz
Output Frequencies for Ethernet
- 62.5MHz, 125MHz, 156.25MHz, 312.5MHz
Low Jitter
- 0.14ps_RMS (1.875MHz to 20MHz)
- 0.36ps_RMS (12kHz to 20MHz)
Excellent Power-Supply Noise Rejection
No External Loop Filter Capacitor Required

Ethernet Networking Equipment

Key Specifications: Clock Generators

Part Number

Applications

f_IN
(MHz)

f_OUT
(MHz)

Fixed or Continuous Frequency

Output Levels

Out-
puts

PLLs

Spread Spectrum

Output Jitter
(ps)

V_SUPPLY
(V)

Package/Pins

Price

min

max

min

max

RMS

See Notes

MAX3679

Ethernet

62.5

312.5

Fixed

LVCMOS

LVPECL

0.14

3.3

TQFN/32

$9.13 @1k

See All Clock Generators (27)

Diagram

Typical Application Circuit

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Document Ref.: 19-4374; Rev 0; 2008-12-23
This page last modified: 2009-07-08