MAXIM MAX3980 Technical data
General Description
The MAX3980 quad equalizer provides compensation
for transmission medium losses for four “lanes” of digital NRZ data at a 3.125Gbps data rate in one package.
It is tailor-made for 10-Gigabit Ethernet (10GbE) backplane applications requiring attenuation of noise and jitter 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 100Ω 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)
InfiniBandSM(2.5Gbps)
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
MAX3980
3.125Gbps XAUI Quad Equalizer
________________________________________________________________
Maxim Integrated Products
1
Ordering Information
LINE CARD
PMD MAC
RxRxTx
Tx
RxRxTx
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
+
Denotes a lead-free/RoHS-compliant package.
*
EP = Exposed pad.
InfiniBand is a trademark and service mark of the InfiniBand Trade Association.
PART TEMP RANGE PIN-PACKAGE
MAX3980UGH 0°C to +85°C 44 QFN-EP*
MAX3980UTH+ 0°C to +85°C 44 TQFN-EP*
MAX3980
3.125Gbps XAUI Quad Equalizer
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(VCC= +3.0V to +3.6V, input data rate = 3.125Gbps, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless
otherwise noted.)
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
Supply Voltage, VCC..............................................-0.5V to +4.0V
Voltage at SDET, IN_±................................-0.5V to (V
CC
+ 0.5V)
Current Out of OUT_±.......................................-25mA to +25mA
Continuous Power Dissipation (T
A
= +85°C)
44-Pin QFN-EP (derate 26.3mW/°C above +85°C)...2105mW
Operating Ambient Temperature Range ................0°C to +85°C
Storage Temperature Range .............................-55°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Supply Power
Supply Noise Tolerance
Signal Detect Assert Input signal level to assert SDET (Note 1) 100 mVp-p
Signal Detect Deassert Input signal level to deassert SDET (Note 1) 30 mVp-p
Signal Detect Delay 10 μs
Latency From input to output 0.32 ns
CML RECEIVER INPUT
Input Voltage Swing
Return Loss 100MHz to 2.5GHz 12 dB
Input Resistance Differential 80 100 120 Ω
EQUALIZATION
Residual Jitter
Random Jitter (Note 2) 1.5 ps
CML TRANSMITTER OUTPUT (into 100Ω ±1Ω)
Output Voltage Swing Differential swing 550 850 mVp-p
Common-Mode Voltage VCC - 0.3 V
Transition Time tf, t
Differential Skew
Output Resistance Single ended 40 50 60 Ω
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
EN = TTL low 0.25
EN = TTL high 0.7 0.9
10Hz < f < 100Hz 100
100Hz < f < 1MHz 40
1MHz < f < 2.5GHz 10
XAUI transmitter output measured
differentially at point A, Figure 1, using
K28.5 pattern
Total jitter (Note 2) 0.3
Deterministic jitter 0.2
20% to 80% (Note 3) 60 130 ps
r
Difference in 50% crossing between OUT_+
and OUT_-
200 800 mVp-p
12 ps
W
mVp-p
UIp-p
RMS
MAX3980
3.125Gbps XAUI Quad Equalizer
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= +3.0V to +3.6V, input data rate = 3.125Gbps, TA= 0°C to +85°C. Typical values are at VCC= +3.3V and TA= +25°C, unless
otherwise noted.)
Note 1: K28.7 pattern is applied differentially at point A as shown in Figure 1.
Note 2: Total jitter does not include the signal source jitter. Total jitter (TJ) = [14.1 x RJ + DJ] where RJ is random RMS jitter and DJ
is maximum deterministic jitter. Signal source is a K28.5± pattern (00 1111 1010 11 0000 0101) for the deterministic jitter
test and K28.7 (0011111000) or equivalent for the random jitter test. Residual jitter is that which remains after equalizing
media-induced losses of the environment of Figure 1 or its equivalent. The deterministic jitter at point B must be from mediainduced loss and not from clock-source modulation. Jitter is measured at 0 at point C of Figure 1.
Note 3: Using K28.7 (0011111000) pattern.
Figure 1. Test Conditions Referenced in the Electrical Characteristics Table
TTL CONTROL PINS
Input High Voltage 2.0 V
Input Low Voltage 0.8 V
Input High Current 250 μA
Input Low Current 500 μA
Output High Voltage Internal 10kΩ pullup 2.4 V
Output Low Voltage Internal 10kΩ pullup 0.4 V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
A
FR-4 STRIPLINE
SMA
CONNECTOR
B
≤ 40in (1m)
MAX3980
SMA
CONNECTOR
C
OUTIN
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