MAX3625A Просмотр технического описания (PDF) - Maxim Integrated

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MAX3625A

Low-Jitter, Precision Clock Generator with Three Outputs

Maxim Integrated 

19-4626; Rev 0; 5/09

EVAALVUAAILTAIOBNLEKIT

Low-Jitter, Precision Clock

Generator with Three Outputs

General Description

The MAX3625A 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, 10G Fibre Channel, and other net-

working applications.

Maxim’s proprietary PLL design features ultra-low jitter

and excellent power-supply noise rejection, minimizing

design risk for network equipment.

The MAX3625A has three LVPECL outputs. Selectable

output dividers and a selectable feedback divider allow

a range of output frequencies.

Applications

Ethernet Networking Equipment

Fibre Channel Storage Area Network

Pin Configuration and Typical Application Circuit appear at

end of data sheet.

IN_SEL

MR

Features

♦ Crystal Oscillator Interface: 24.8MHz to 27MHz

♦ CMOS Input: Up to 320MHz

♦ Output Frequencies

Ethernet: 62.5MHz, 125MHz, 156.25MHz, 312.5MHz

10G Fibre Channel: 159.375MHz, 318.75MHz

♦ 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

MAX3625ACUG+

0°C to +70°C

24 TSSOP

+Denotes a lead(Pb)-free/RoHS-compliant package.

BYPASS

SELA[1:0]

Block Diagram

REF_IN

27pF

X_IN

X_OUT

33pF

SELA[1:0]

SELB[1:0]

FB_SEL

BYPASS

RESET LOGIC/POR

RESET

LVCMOS

0

1

CRYSTAL

OSCILLATOR

DIVIDERS:

M = 24, 25

NA = 10, 2, 4, 5

NB = 10, 2, 4, 5

0

620MHz TO 648MHz

PFD

FILTER

VCO

1

RESET

DIVIDER

M

MAX3625A

DIVIDER

NA

RESET

LVPECL

BUFFER

RESET

DIVIDER

NB

LVPECL

BUFFER

LVPECL

BUFFER

QA_OE

QA

QA

QB1

QB1

QB_OE

QB0

QB0

FB_SEL

SELB[1:0]

________________________________________________________________ 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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