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MAX3981

3.125Gbps XAUI Quad Cable Equalizer

Maxim Integrated 

21-2178; Rev 1; 5/03

3.125Gbps XAUI Quad Cable Equalizer

General Description

The MAX3981 quad equalizer provides compensation

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

tal NRZ data at a data rate of 3.125Gbps in one

package. It is tailor-made for 10Gigabit Ethernet appli-

cations that require attenuation of noise and jitter that

occur in communicating with chassis-to-chassis inter-

connect. In support of IEEE-802.3ae for the XAUI inter-

face, the MAX3981 adaptively allows XAUI lanes to

reach 10m (33ft) with inexpensive twin-axial cable for

extended backplane applications.

The equalizer has 100Ω differential CML data inputs

and outputs.

The MAX3981 is available in a 44-pin exposed-pad

QFN package. The MAX3981 consumes only 700mW at

3.3V or 175mW per channel.

Features

♦ Four Differential Digital Data “Lanes” at

3.125Gbps

♦ Span 10m (33ft) of Twin-Axial Cable

♦ Receiver Equalization Reduces Intersymbol

Interference (ISI)

♦ Low Power, 175mW per Channel

♦ Standby Mode—Power-Down State

♦ Single 3.3V Supply

♦ Signal Detect

Applications

IEEE–802.3ae XAUI Interface (3.125Gbps)

InfiniBand (2.5Gbps)

Ordering Information

PART

MAX3981UGH

TEMP

RANGE

0°C to +85°C

PIN-

PACKAGE

44 QFN

PACKAGE

CODE

G4477-1

Pin Configuration appears at end of data sheet.

LINE CARD

PMD

MAC

Typical Operating Circuit

SWITCH CARD

SWITCH

Rx Tx 4

10GbE

4

Tx Rx

Rx

Tx

4

4 x 3.125Gbps

3.3V

SUPPLY

4

Tx Rx

OUT

IN

MAX3981

4

IN MAX3981 OUT

Rx

3.3V

SUPPLY

4

Tx

10m (33ft)100Ω

TWIN-AX CABLE

________________________________________________________________ Maxim Integrated Products 1

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.

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