Rainbow Electronics MAX3671 User Manual

General description, Applications, Features

General Description

The MAX3671 is a low-jitter frequency synthesizer that
accepts two reference clock inputs and generates nine
phase-aligned outputs. The device features 40kHz jitter
transfer bandwidth, 0.3ps

RMS

(12kHz to 20MHz) inte-

grated phase jitter, and best-in-class power-supply
noise rejection (PSNR), making it ideal for jitter clean-
up, frequency translation, and clock distribution in
Gigabit Ethernet applications.

The MAX3671 operates from a single +3.3V supply and
typically consumes 400mW. The IC is available in an
8mm x 8mm, 56-pin TQFN package, and operates from
-40°C to +85°C.

Applications

Gigabit Ethernet Routers and Switches

Frequency Translation

Jitter Cleanup

Clock Distribution

Features

♦ Two Reference Clock Inputs: LVPECL
♦ Nine Phase-Aligned Clock Outputs: LVPECL
♦ Input Frequencies: 62.5MHz,125MHz, 250MHz,

312.5MHz

♦ Output Frequencies: 62.5MHz, 125MHz,

156.25MHz, 250MHz, 312.5MHz

♦ Low-Jitter Generation: 0.3ps

RMS

(12kHz to 20MHz)

♦ Clock Failure Indicator for Both Reference Clocks
♦ External Feedback Provides Zero-Delay Capability
♦ Low Output Skew: 20ps Typical

MAX3671

Low-Jitter Frequency Synthesizer

with Selectable Input Reference

________________________________________________________________

Maxim Integrated Products

Ordering Information

19-4437; Rev 0; 2/09

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.

EVALUATION KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX3671ETN+ -40

°C to +85°C 56

TQFN-EP*

SIGNAL QUALIFIER

AND

LOCK DETECT

POWER-ON

RESET

(POR)

IN0FAIL

IN1FAIL

LOCK

REFCLK0

FB_IN

FB_SEL

FB_IN

REFCLK1

DIV M

SEL_CLK

PFD

DIV N

DIV A

DIV B

VCO

2.5GHz

62.5MHz

OUTA2

OUTA1

OUTA3

OUTA0

OUTB_EN

OUTA0

OUTA_EN

PLL_BYPASS

OUTB3

OUTB2

OUTB4

OUTB1

OUTB0

PLL

0.1

μF

REG

0.22

μF

MAX3671

Functional Diagram

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

EP = Exposed pad.

Pin Configuration and Typical Application Circuits appear at
end of data sheet.