Rainbow-electronics MAX9452 Instrukcja Użytkownika Pobierz pdf

General Description

The MAX9450/MAX9451/MAX9452 clock generators

provide high-precision clocks for timing in SONET/SDH

systems or Gigabit Ethernet systems. The MAX9450/

MAX9451/MAX9452 can also provide clocks for the high-

speed and high-resolution ADCs and DACs in 3G base

stations. Additionally, the devices can also be used as a

jitter attenuator for generating high-precision CLK signals.

The MAX9450/MAX9451/MAX9452 feature an integrated

VCXO. This configuration eliminates the use of an exter-

nal VCXO and provides a cost-effective solution for gen-

erating high-precision clocks. The MAX9450/MAX9451/

MAX9452 feature two differential inputs and clock out-

puts. The inputs accept LVPECL, LVDS, differential sig-

nals, and LVCMOS. The input reference clocks range

from 8kHz to 500MHz.

The MAX9450/MAX9451/MAX9452 offer LVPECL, HSTL,

and LVDS outputs, respectively. The output range is up

to 160MHz, depending on the selection of crystal. The

input and output frequency selection is implemented

through the I

C* or SPI™ interface. The MAX9450/

MAX9451/MAX9452 feature clock output jitter less than

0.8ps RMS (in a 12kHz to 20MHz band) and phase-

noise attenuation greater than -130dBc/Hz at 100kHz.

The phase-locked loop (PLL) filter can be set externally,

and the filter bandwidth can vary from 1Hz to 20kHz.

The MAX9450/MAX9451/MAX9452 feature an input

clock monitor with a hitless switch. When a failure is

detected at the selected reference clock, the device

can switch to the other reference clock. The reaction to

the recovery of the failed reference clock can be

revertive or nonrevertive. If both reference clocks fail,

the PLL retains its nominal frequency within a range of

±20ppm at +25°C.

The MAX9450/MAX9451/MAX9452 operate from a 2.4V to

3.6V supply and are available in 32-pin TQFP packages

with exposed pads.

Applications

SONET/SDH Systems

10 Gigabit Network Routers and Switches

3G Cellular Phone Base Stations

General Jitter Attenuation

*Purchase of I

C components from Maxim Integrated Products,

Inc., or one of its sublicensed Associated Companies, conveys

a license under the Philips I

C Patent Rights to use these com-

ponents in an I

C system, provided that the system conforms to

the I

C Standard Specification as defined by Philips.

SPI is a trademark of Motorola, Inc.

Features

♦ Integrated VCXO Provides a Cost-Effective

Solution for High-Precision Clocks

♦ 8kHz to 500MHz Input Frequency Range

♦ 15MHz to 160MHz Output Frequency Range

♦ I

C or SPI Programming for the Input and Output

Frequency Selection

♦ PLL Lock Range > ±60ppm

♦ Two Differential Outputs with Three Types of

Signaling: LVPECL, LVDS, or HSTL

♦ Input Clock Monitor with Hitless Switch

♦ Internal Holdover Function within ±20ppm of the

Nominal Frequency

♦ Low Output CLK Jitter: < 0.8ps RMS in the 12kHz

to 20MHz Band

♦ Low Phase Noise > -130dBc at 100kHz

MAX9450/MAX9451/MAX9452

High-Precision Clock Generators

with Integrated VCXO

________________________________________________________________ Maxim Integrated Products 1

Ordering Information

19-0547; Rev 0; 5/06

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

Note: All devices are specified over the -40°C to +85°C

temperature range.

+Denotes lead-free package.

**EP = Exposed pad.

†Future product—contact factory for availability.

PART PIN-PACKAGE OUTPUT PKG CODE

MAX9450EHJ+ 32 TQFP-EP** LVPECL H32E-6

MAX9451EHJ+† 32 TQFP-EP** HSTL H32E-6

MAX9452EHJ+† 32 TQFP-EP** LVDS H32E-6

MAX9450

MAX9451

MAX9452

TQFP

(5mm x 5mm)

TOP VIEW

EXPOSED PAD

(GND)

24 20

212223

CLK1+

CLK1-

GND

CLK0+

DDQ

CLK0-

DDQ

834

SEL0

IN0-

IN0+

IN1+

AD1

AD0

SDA

SCL

INT

32RJ

GNDA

LP2

LP1

DDA

25V

SEL1

LOCK

IN1-

GND/CS

CMON

Pin Configuration

1 2 3 4 5 6 ... 15 16

MAX9450/MAX9451/MAX9452 1

Podsumowanie treści

Strona 1 - MAX9450/MAX9451/MAX9452

General DescriptionThe MAX9450/MAX9451/MAX9452 clock generatorsprovide high-precision clocks for timing in SONET/SDHsystems or Gigabit Ethernet system

Strona 2

MAX9450/MAX9451/MAX9452High-Precision Clock Generatorswith Integrated VCXO10 _________________________________________________________________________

Strona 3