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MAX3679A fiches techniques PDF

Maxim Integrated Products - Low-Jitter Crystal to LVPECL Clock Generator

Numéro de référence MAX3679A
Description Low-Jitter Crystal to LVPECL Clock Generator
Fabricant Maxim Integrated Products 
Logo Maxim Integrated Products 





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MAX3679A fiche technique
19-4858; Rev 0; 8/09
EVAALVUAAILTAIOBNLEKIT
www.DataSheet4U.com
+3.3V, Low-Jitter Crystal to LVPECL
Clock Generator
General 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.
Applications
Ethernet Networking Equipment
Pin Configuration appears at end of data sheet.
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
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX3679AETJ+
-40°C to +85°C
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Application Circuit
10.5Ω
0.1μF
0.1μF
0.1μF
0.01μF
0.1μF
+3.3V ±5%
10μF
0.1μF
VCC
VCC
VCCA
MR
REF_IN
VCCO_A
VCCO_B
IN_SEL
QAC_OE
QA_OE
QB0_OE
QB1_OE
MAX3679A
BYPASS
SELA1
SELA0
SELB1
SELB0
RES1
RES0
X_OUT
X_IN
25MHz
(CL = 18pF)
GND
VDDO_A
QA_C
125MHz
36Ω
QA Z0 = 50Ω
QA Z0 = 50Ω
125MHz
QB0 Z0 = 50Ω
QB0 Z0 = 50Ω
312.5MHz
QB1 Z0 = 50Ω
QB1 Z0 = 50Ω
312.5MHz
GNDO_A
33pF 27pF
Z0 = 50Ω
ASIC
ASIC
50Ω 50Ω
(VCC - 2V)
ASIC
50Ω 50Ω
(VCC - 2V)
ASIC
50Ω 50Ω
(VCC - 2V)
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.

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