21-2178; Rev 0; 11/01
3.125Gbps XAUI Quad Cable Equalizer
General Description
The MAX3981 quad equalizer provides compensation
for transmission medium losses for four 鈥渓anes鈥?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 100鈩?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
o
Four Differential Digital Data 鈥淟anes鈥?at
3.125Gbps
o
Span 10m (33ft) of Twin-Axial Cable
o
Receiver Equalization Reduces Intersymbol
Interference (ISI)
o
Low Power, 175mW per Channel
o
Standby Mode鈥擯ower-Down State
o
Single 3.3V Supply
o
Signal Detect
MAX3981
Applications
IEEE鈥?02.3ae XAUI Interface (3.125Gbps)
InfiniBand (2.5Gbps)
PART
MAX3981UGH
Ordering Information
TEMP. RANGE
0掳C to +85掳C
PIN-PACKAGE
44 QFN-EP*
*Exposed
pad
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
LINE CARD
SWITCH CARD
PMD
MAC
SWITCH
Rx
Tx
4
Rx
Tx
4 x 3.125Gbps
4
IN
MAX3981
3.3V
SUPPLY
OUT
4
Rx
10GbE
3.3V
SUPPLY
4
4
Tx
Rx
Tx
Rx
OUT
MAX3981
IN
10m (33ft)100鈩?/div>
TWIN-AX CABLE
4
Tx
________________________________________________________________
Maxim Integrated Products
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For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim鈥檚 website at www.maxim-ic.com.
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