MAX3679A

更新时间： 2024-11-13 05:49:03

品牌	Logo	应用领域
美信 - MAXIM		晶体时钟发生器
页数	文件大小	规格书
11页	387K
描述
+3.3V, Low-Jitter Crystal to LVPECL Clock Generator

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数据手册

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MAX3679A 数据手册

19-4858; Rev 0; 8/09

+3.3V, Low-Jitter Crystal to LVPECL

Clock Generator

MX3679A

General Description

Features

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.

♦ Crystal Oscillator Interface: 25MHz

♦ CMOS Input: 25MHz

♦ Output Frequencies for Ethernet

62.5MHz, 125MHz, 156.25MHz, 312.5MHz

♦ Low Jitter

0.14ps

(1.875MHz to 20MHz)

(12kHz to 20MHz)

RMS

Maxim’s proprietary PLL design features ultra-low jitter

0.36ps

RMS

(0.36ps

) and excellent power-supply noise rejection,

RMS

minimizing design risk for network equipment.

♦ Excellent Power-Supply Noise Rejection

♦ No External Loop Filter Capacitor Required

Applications

Ordering Information

Ethernet Networking Equipment

PART

TEMP RANGE

PIN-PACKAGE

MAX3679AETJ+

-40°C to +85°C

32 TQFN-EP*

Pin Configuration appears at end of data sheet.

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

*EP = Exposed pad.

Typical Application Circuit

+3.3V 5%

0.1μF

0.01μF

0.1μF

10.5Ω

DDO_A

CCO_A

CCO_B

10μF

36Ω

QA_C

Z = 50Ω

ASIC

CCA

125MHz

0.1μF

REF_IN

Z = 50Ω

IN_SEL

QAC_OE

QA_OE

50Ω

QB0_OE

QB1_OE

(V - 2V)

MAX3679A

QB0

Z = 50Ω

ASIC

Z = 50Ω

BYPASS

SELA1

SELA0

SELB1

SELB0

RES1

312.5MHz

(V - 2V)

QB1

Z = 50Ω

ASIC

RES0

Z = 50Ω

X_OUT

X_IN

GND

GNDO_A

25MHz

(C = 18pF)

(V - 2V)

33pF

27pF

________________________________________________________________ Maxim Integrated Products

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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