General Description

The MAX3980 quad equalizer provides compensation

for transmission medium losses for four “lanes” of digi-

tal NRZ data at a 3.125Gbps data rate in one package.

It is tailor-made for 10-Gigabit Ethernet (10GbE) back-

plane applications requiring attenuation of noise and jit-

ter that occur in communicating from MAC to PMD or

from MAC to Switch. In support of the IEEE-802.3ae for

the XAUI interface, the MAX3980 adaptively allows

XAUI lanes to reach up to 40in (1.0m) on FR-4 board

material.

The equalizer has 100

Ω differential CML data inputs

and outputs.

The MAX3980 is available in a 44-pin exposed-pad

QFN package. The MAX3980 consumes only 700mW at

+3.3V or 175mW per channel.

Applications

IEEE-802.3ae XAUI Interface (3.125Gbps)

Features

♦ Four Differential Digital Data “Lanes” at

3.125Gbps

♦ Spans 40in (1.0m) of FR-4 PC Board

♦ Receiver Equalization Reduces Intersymbol

Interference (ISI)

♦ Low-Power, 175mW per Channel

♦ Standby Mode—Power-Down State

♦ Single +3.3V Supply

♦ Signal Detect

3.125Gbps XAUI Quad Equalizer

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

LINE CARD

PMD

MAC

Rx

Rx

Tx

Tx

Rx

Rx

Tx

Tx

10GbE

4

4

4

4

4

4

4 x 3.125Gbps

4 x

3.125Gbps

SWITCH

Rx

Tx

≤ 40in (1.0m)

SWITCH CARD

MAX3980

OUT

IN

+3.3V

SUPPLY

MAX3980

IN

OUT

+3.3V

SUPPLY

PC BOARD

BACKPLANE

≤ 40in (1.0m)

Typical Application Circuit

19-2153; Rev 3; 12/08

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.

Pin Configuration appears at end of data sheet.

EVALUATION

KIT

AVAILABLE

PART

TEMP RANGE

PIN-PACKAGE

MAX3980UGH

0°C to +85°C

44 QFN-EP*

MAX3980UTH+

0°C to +85°C

44 TQFN-EP*

+

Denotes a lead-free/RoHS-compliant package.

*

EP = Exposed pad.

InfiniBand is a trademark and service mark of the InfiniBand Trade Association.