Low-Jitter, Precision Clock Generator

with Two Outputs

________________________________________________________________

Maxim Integrated Products

1

19-2456; Rev 0; 11/07

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.

General Description

The MAX3622 is a low-jitter precision clock generator

optimized for networking applications. The device inte-

grates a crystal oscillator and a phase-locked loop

(PLL) clock multiplier to generate high-frequency clock

outputs for Ethernet and other networking applications.

Maxim’s proprietary PLL design features ultra-low jitter

tion, minimizing design risk for network equipment.

The MAX3622 has one LVPECL output and one

LVCMOS output. It is available in a 16-pin TSSOP pack-

age and operates over the 0°C to +70°C temperature

range.

Applications

Ethernet Networking Equipment

Features

♦ Crystal Oscillator Interface: 25MHz Typical

♦ Output Frequencies: 125MHz and 156.25MHz

♦ Low Jitter

♦ Excellent Power-Supply Noise Rejection

♦ No External Loop Filter Capacitor Required

Ordering Information

CRYSTAL

OSCILLATOR

X_IN

X_OUT

PFD

FILTER

RESET

RESET

RESET LOGIC/POR

÷ 25

RESET

÷ 4

÷ 5

VCO

LVCMOS

BUFFER

QA_C

QAC_OE

LVPECL

BUFFER

QB

QB_OE

QB

MAX3622

RESET

625MHz

25MHz

33pF

27pF

Block Diagram

+

Denotes a lead-free package.

Typical Application Circuit and Pin Configuration appear

at end of data sheet.

PART

TEMP RANGE

PIN-

PACKAGE

PKG

CODE

MAX3622CUE+

0

°C to +70°C

16 TSSOP

U16-2