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MAX3679A
+3.3V, Low-Jitter Crystal to LVPECL Clock Generator
Generates All Ethernet Frequencies from Low-Cost 25MHz Crystal
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Status
Active: In Production.
Description
The MAX3679A 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 (0.36psRMS) and excellent power-supply noise rejection, minimizing design risk for network equipment.
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Data Sheet
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An evaluation kit is available: MAX3679AEVKIT
Key Features
- Crystal Oscillator Interface: 25MHz
- CMOS Input: 25MHz
- Output Frequencies for Ethernet
- 62.5MHz, 125MHz, 156.25MHz, 312.5MHz
- Low Jitter
- 0.14psRMS (1.875MHz to 20MHz)
- 0.36psRMS (12kHz to 20MHz)
- Excellent Power-Supply Noise Rejection
- No External Loop Filter Capacitor Required
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Applications/Uses
- Ethernet Networking Equipment
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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 |
Budgetary Price |
| min |
max |
min |
max |
RMS |
See Notes |
| MAX3679A |
Ethernet |
25 |
25 |
62.5 |
312.5 |
Fixed |
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4 |
1 |
No |
0.14 |
3.3 |
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$7.57 @1k |
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See All Clock Generators (34)
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Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.
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Diagram
Typical Application Circuit
More Information
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Information Index
Document Ref.: 19-4858
Rev 0;
2009-08-14
This page last modified: 2009-08-14
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