General Description
The MAX3983 is a quad copper-cable signal conditioner
that operates from 2.5Gbps to 3.2Gbps. It provides com-
pensation for 4x copper InfiniBand and 10Gbase-CX4
Ethernet links, allowing spans of 20m with 24AWG and
15m with 28AWG. The cable driver section provides four
selectable preemphasis levels. The input to the cable
driver compensates for up to 0.5m of FR4 circuit board
material. The cable receiver section provides additional
fixed input equalization while offering selectable preem-
phasis to drive FR4 circuit boards up to 0.5m.
The MAX3983 also features signal detection on all eight
inputs and internal loopback that allows for diagnostic
testing. It is packaged in a 10mm x 10mm, 68-pin QFN
and operates from 0°C to +85°C.
Applications
4x InfiniBand (4 x 2.5Gbps)
10Gbase-CX4 Ethernet (4 x 3.125Gbps)
10G Fibre Channel XAUI (4 x 3.1875Gbps)
4x Copper-Cable or Backplane Transmission
(1Gbps to 3.2Gbps)
Features
o Link Features
Span 20m with 24AWG, 15m with 28AWG
Span 0.5m of FR4 on Each Host
1.6W Total Power with 3.3V Supply
Loopback Function
o Cable Driver Features
Selectable Output Preemphasis
FR4 Input Equalization
Signal Detect for Each Channel
Output Disable
o Cable Receiver Features
Selectable FR4 Output Preemphasis
Cable Input Equalization
Signal Detect for Each Channel
Output Disable
MAX3983
Quad Copper-Cable Signal Conditioner
________________________________________________________________ Maxim Integrated Products
1
MAX3983
RX_SD1
RX_SD2
RX_SD3
RX_SD4
TX_SD1
TX_SD2
TX_SD3
TX_SD4
TX_OUT1
TX_OUT2
TX_OUT3
TX_OUT4
RX_IN1
RX_IN2
RX_IN3
RX_IN4
TX_IN1
TX_IN2
TX_IN3
TX_IN4
RX_OUT1
RX_OUT2
RX_OUT3
RX_OUT4
4.7k
4.7k
3V TO 5.5V
3V TO 5.5V
TO HOST
TX_ENABLE
RX_ENABLE
TX_PE0
RX_PE
TX_PE1
SERDES
TX
RX
0.5m
V
CC
[1:4]
3.3V
GND
POR
LOOPBACK
TO HOST
0.01
µF
0.01
µF
TO MAX3983
4x COPPER CABLE ASSEMBLY
20m (24AWG)
15m (28AWG)
V
CC
OR
GND
C
POR
Typical Application Circuit
Ordering Information
19-2928; Rev 0; 7/03
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.
PART
TEMP RANGE
PIN-
PACKAGE
PKG CODE
MAX3983UGK
0°C to +85°C
68 QFN
G6800-4
Pin Configuration appears at end of data sheet.
MAX3983
Quad Copper-Cable Signal Conditioner
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +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, V
CC
..............................................-0.5V to +6.0V
Continuous CML Output Current at
TX_OUT[1:4]
±, RX_OUT[1:4]± ....................................±25mA
Voltage at TX_IN[1:4]
±, RX_IN[1:4]±, RX_SD[1:4],
TX_SD[1:4], RX_ENABLE, TX_ENABLE, RX_PE,
TX_PE[0:1], LOOPBACK, POR
(with series resistor
4.7k)...................-0.5V to (V
CC
+ 0.5V)
Continuous Power Dissipation (T
A
= +85
°C)
68-Pin QFN (derate 41.7mW/
°C above +85°C).............2.7W
Operating Junction Temperature Range (T
J
) ....-55
°C to +150°C
Storage Ambient Temperature Range (T
S
) .......-55
°C to +150°C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RX_EN = V
CC
, TX_EN = 0V
360
430
RX_EN = 0V, TX_EN = V
CC
365
430
Supply Current
RX_EN = V
CC
, TX_EN = V
CC
495
580
mA
OPERATING CONDITIONS
Supply Voltage
V
CC
3.0
3.3
3.6
V
Supply Noise Tolerance
1MHz
f < 2GHz
40
mV
P-P
Operating Ambient Temperature
T
A
0
25
85
°C
Bit Rate
NRZ data (Note 1)
2.5
3.2
Gbps
CID
Consecutive identical digits (bits)
10
Bits
STATUS OUTPUTS: RX_SD[1:4], TX_SD[1:4]
Signal detect asserted
0
25
µA
Signal detect unasserted V
OL
0.4V with 4.7k
pullup resistor
1.0
1.11
mA
Signal-Detect Open-Collector
Current Sink
V
CC
= 0V, pullup supply = 5.5V, external pullup
resistor
4.7k
0
25
µA
Signal-Detect Response Time
Time from RX_IN[1:4] or TX_IN[1:4] dropping
below 85mV
P-P
or rising above 175mV
P-P
to
50% point of signal detect
0.35
µs
Signal-Detect Transition Time
Rise time or fall time (10% to 90%)
200
ns
Power-On Reset Delay
1µF capacitor on POR to GND
6
ms
CONTROL INPUTS: RX_ENABLE, TX_ENABLE, RX_PE, TX_PE0, TX_PE1, LOOPBACK
Voltage, Logic High
V
IH
1.5
V
Voltage, Logic Low
V
IL
0.5
V
Current, Logic High
I
IH
V
IH
= V
CC
-150
+150
µA
Current, Logic Low
I
IL
V
IL
= 0V
-150
+150
µA
MAX3983
Quad Copper-Cable Signal Conditioner
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
TX SECTION (CABLE DRIVER)
PC Board Input Swing
Measured differentially at the signal source
(Note 1)
800
1600
mV
P-P
Input Resistance
TX_IN[1:4]+ to TX_IN[1:4]-, differential
85
100
115
Input Return Loss
100MHz to 2GHz (Note 1)
10
17
dB
TX_ENABLE = high (Notes 1, 2)
1300
1500
1600
Output Swing
TX_ENABLE = low
30
mV
P-P
Output Resistance
TX_OUT[1:4]+ or TX_OUT[1:4]- to V
CC
, single
ended
42
50
58
Output Return Loss
100MHz to 2GHz (Note 1)
10
dB
Output Transition Time
t
r
, t
f
20% to 80% (Notes 1, 3)
13
80
ps
Random Jitter
(Notes 1, 3)
1.6
ps
RMS
TX_PE1
TX_PE0
0
0
3
0
1
6
1
0
9
Output Preemphasis
See Figure 1
1
1
12
dB
Source to
TX_IN
TX_OUT to
Load
TX_PE1 TX_PE0
1m, 28AWG
0
0
5m, 28AWG
0
1
10m, 24AWG
1
0
Residual Output Deterministic
Jitter at 2.5Gbps (Notes 1, 4, 5)
6-mil FR4
20in
15m, 24AWG
1
1
0.10
0.15
UI
P-P
Source to
TX_IN
TX_OUT to
Load
TX_PE1 TX_PE0
1m, 28AWG
0
0
5m, 28AWG
0
1
10m, 24AWG
1
0
Residual Output Deterministic
Jitter at 3.2Gbps (Notes 1, 4, 5)
6-mil FR4
20in
15m, 24AWG
1
1
0.15
0.20
UI
P-P
Signal-Detect Assert Level
TX_IN for TX_SD = high (Note 6)
800
mV
P-P
Signal-Detect Off
TX_IN for TX_SD = low (Note 6)
200
mV
P-P
RX SECTION (CABLE RECEIVER)
Cable Input Swing
Measured differentially at the signal source
(Note 1)
1000
1600
mV
P-P
Input Vertical Eye Opening
Measured differentially at the input of the
MAX3983 (Note 1)
175
1600
mV
P-P
Input Resistance
RX_IN[1:4]+ to RX_IN[1:4]-, differential
85
100
115
Input Return Loss
100MHz to 2GHz (Note 1)
10
18
dB
MAX3983
Quad Copper-Cable Signal Conditioner
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RX_ENABLE = high (Notes 1, 7)
1100
1500
Output Swing
RX_ENABLE = low
30
mV
P-P
Output Resistance
RX_OUT[1:4]+ or RX_OUT[1:4]- to V
CC
, single
ended
42
50
58
Output Return Loss
100MHz to 2GHz (Note 1)
10
15
dB
Output Transition Time
t
r
, t
f
20% to 80% (Notes 1, 8)
45
80
ps
Random Jitter
(Notes 1, 8)
1.6
ps
RMS
RX_PE = low
3
Output Preemphasis
RX_PE = high
6
dB
Source to
RX_IN
RX_OUT to
Load
RX_PE
0in, 6-mil FR4
0
Residual Output Deterministic
Jitter at 2.5Gbps
(Notes 1, 5, 9, 10)
5m, 28AWG
IB Cable
Assembly
without
preemphasis
20in, 6-mil FR4
1
0.10
0.15
UI
P-P
Source to
RX_IN
RX_OUT to
Load
RX_PE
0in, 6-mil FR4
0
Residual Output Deterministic
Jitter at 3.2Gbps
(Notes 1, 5, 9, 10)
5m, 28AWG
IB cable
assembly
without
preemphasis
20in, 6-mil FR4
1
0.15
0.20
UI
P-P
Signal-Detect Assert Level
RX_IN for RX_SD = high (Note 11)
175
mV
P-P
Signal-Detect Off
RX_IN for RX_SD = low (Note 11)
85
mV
P-P
END-TO-END JITTER (TX AND RX COMBINED PERFORMANCE)
Source to
TX_IN
TX_OUT to
RX_IN
TX_PE1
TX_PE0
R
X
_
O
U
T
to
Load
RX_PE
1m, 24AWG
0
0
0in
0
6-mil FR4
15m, 24AWG 1
1
20in
1
0.15
0.20
Residual Output Deterministic
Jitter at 2.5Gbps
(Notes 1, 12, 13, 14)
20m, 24AWG
1
1
20in
1
0.2
0.25
UI
P-P
MAX3983
Quad Copper-Cable Signal Conditioner
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +3.6V, T
A
= 0°C to +85°C. Typical values are at V
CC
= +3.3V and T
A
= +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Source to
TX_IN
TX_OUT to RX_IN
TX_PE1
TX_PE0
RX_OUT to Load
RX_PE
1m, 24AWG
0
0
5in
0
15m, 24AWG
1
1
20in
1
0.20
0.25
Residual Output Deterministic
Jitter at 3.2Gbps
(Notes 1, 12, 13, 14)
6-mil FR4
20 in
20m, 24AWG
1
1
20in
1
0.25
0.3
UI
P-P
Note 1:
Guaranteed by design and characterization.
Note 2:
Measured with 2in of FR4 through InfiniBand connector with TX_PE1 = TX_PE0 =1.
Note 3:
Measured at the chip using 0000011111 or equivalent pattern. TX_PE1 = TX_PE0 = 0 for minimum preemphasis.
Note 4:
All channels under test are not transmitting during test. Channel tested with XAUI CJPAT, as well as this pattern: 19 zeros,
1, 10 zeros, 1010101010 (D21.5 character), 1100000101 (K28.5+ character), 19 ones, 0, 10 ones, 0101010101 (D10.2
character), 0011111010 (K28.5- character).
Note 5:
Cables are unequalized, Amphenol Spectra-Strip 24AWG and 28AWG or equivalent equipped with Fujitsu "MicroGiga"
connector or equivalent. All other channels are quiet. Residual deterministic jitter is the difference between the source jit-
ter and the output jitter at the load. The deterministic jitter (DJ) at the output of the transmission line must be from media-
induced loss and not from clock-source modulation. Depending upon the system environment, better results can be
achieved by selecting different preemphasis levels.
Note 6:
Tested with a 1GHz sine wave applied at TX_IN under test with less than 5in of FR4.
Note 7:
Measured with 3in of FR4 with RX_PE = 1.
Note 8:
Measured at the chip using 0000011111 or equivalent pattern. RX_PE = low (minimum). Signal source is 1V
P-P
with 5m,
28AWG InfiniBand cable.
Note 9:
All other receive channels are quiet. TX_ENABLE = 0. Channel tested with XAUI CJPAT as well as this pattern: 19 zeros,
1, 10 zeros, 1010101010 (D21.5 character), 1100000101 (K28.5+ character), 19 ones, 0, 10 ones, 0101010101 (D10.2
character), 0011111010 (K28.5- character).
Note 10: FR4 board material: 6-mil-wide, 100
, edge-coupled stripline (tan = 0.022, 4.0 <
R
< 4.4).
Note 11: Tested with a 1GHz sine wave applied at RX_IN under test with less than 5in of FR4.
Note 12: Channel tested with XAUI CJPAT as well as this pattern: 19 zeros, 1, 10 zeros, 1010101010 (D21.5 character), 1100000101
(K28.5+ character), 19 ones, 0, 10 ones, 0101010101 (D10.2 character), 0011111010 (K28.5- character).
Note 13: Cables are unequalized, Amphenol Spectra-Strip 24AWG or equivalent equipped with Fujitsu "MicroGiga" connector or
equivalent. Residual deterministic jitter is the difference between the source jitter at point A and the load jitter at point B in
Figure 2. The deterministic jitter (DJ) at the output of the transmission line must be from media-induced loss and not from
clock-source modulation. Depending upon the system environment, better results can be achieved by selecting different
preemphasis levels.
Note 14: Valid with pattern generator deterministic jitter as high as 0.17UI
P-P
.
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