MAX3981_08 Datasheet, PDF (1/9 Pages) Maxim Integrated Products – 3.125Gbps XAUI Quad Cable Equalizer

19-2178; Rev 2; 12/08
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.
Applications
IEEE–802.3ae XAUI Interface (3.125Gbps)
InfiniBand^SM (2.5Gbps)
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
Ordering Information
PART
MAX3981UGH
*EP = Exposed pad.
TEMP RANGE
0°C to +85°C
PIN-PACKAGE
44 QFN-EP*
Pin Configuration appears at end of data sheet.
Typical Operating Circuit
LINE CARD
PMD
MAC
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
InfiniBand is a trademark and service mark of the InfiniBand Trade Association.
________________________________________________________________ Maxim Integrated Products 1
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.