19-2928; Rev 1; 2/07
KIT
ATION
EVALU
BLE
AVAILA
Quad Copper-Cable Signal Conditioner
General Description
Features
♦
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
♦
Cable Driver Features
Selectable Output Preemphasis
FR4 Input Equalization
Signal Detect for Each Channel
Output Disable
♦
Cable Receiver Features
Selectable FR4 Output Preemphasis
Cable Input Equalization
Signal Detect for Each Channel
Output Disable
MAX3983
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)
Pin Configuration appears at end of data sheet.
Ordering Information
PART
MAX3983UGK
MAX3983UGK+
TEMP RANGE
0°C to +85°C
0°C to +85°C
PIN-
PACKAGE
68 QFN
68 QFN
PKG CODE
G6800-4
G6800-4
+Denotes
lead-free package.
Typical Application Circuit
≤0.5m
0.01μF
TX_IN1
TX
TX_IN2
TX_IN3
SERDES
TX_IN4
RX_OUT1
RX
RX_OUT2
RX_OUT3
RX_OUT4
TX_PE0
V
CC
OR
GND
3V TO 5.5V
C
POR
4.7kΩ
RX_SD1
RX_SD2
RX_SD3
RX_SD4
GND
TO HOST
TO HOST
TX_PE1
RX_PE
POR
LOOPBACK
TX_ENABLE
RX_ENABLE
3V TO 5.5V
V
CC
[1:4]
TX_OUT1
TX_OUT2
TX_OUT3
TX_OUT4
TO MAX3983
RX_IN1
RX_IN2
RX_IN3
RX_IN4
3.3V
0.01μF
4x COPPER CABLE ASSEMBLY
≤20m
(24AWG)
≤15m
(28AWG)
MAX3983
TX_SD1
TX_SD2
TX_SD3
TX_SD4
4.7kΩ
________________________________________________________________
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.
Quad Copper-Cable Signal Conditioner
MAX3983
ABSOLUTE MAXIMUM RATINGS
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
≥4.7kΩ)...................-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
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.
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.)
PARAMETER
Supply Current
OPERATING CONDITIONS
Supply Voltage
Supply Noise Tolerance
Operating Ambient Temperature
Bit Rate
CID
T
A
NRZ data (Note 1)
Consecutive identical digits (bits)
Signal detect asserted
Signal-Detect Open-Collector
Current Sink
Signal detect unasserted V
OL
≤
0.4V with 4.7kΩ
pullup resistor
V
CC
= 0V, pullup supply = 5.5V, external pullup
resistor
≥4.7kΩ
Signal-Detect Response Time
Signal-Detect Transition Time
Power-On Reset Delay
Voltage, Logic High
Voltage, Logic Low
Current, Logic High
Current, Logic Low
V
IH
V
IL
I
IH
I
IL
V
IH
= V
CC
V
IL
= 0V
-150
-150
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
Rise time or fall time (10% to 90%)
1µF capacitor on POR to GND
1.5
0.5
+150
+150
0
1.0
0
1.11
25
V
CC
1MHz
≤
f < 2GHz
0
2.5
3.0
3.3
40
25
85
3.2
10
25
3.6
V
mV
P-P
°C
Gbps
Bits
µA
mA
µA
SYMBOL
CONDITIONS
RX_EN = V
CC
, TX_EN = 0V
RX_EN = 0V, TX_EN = V
CC
RX_EN = V
CC
, TX_EN = V
CC
MIN
TYP
360
365
495
MAX
430
430
580
mA
UNITS
STATUS OUTPUTS: RX_SD[1:4], TX_SD[1:4]
0.35
200
6
µs
ns
ms
V
V
µA
µA
CONTROL INPUTS: RX_ENABLE, TX_ENABLE, RX_PE, TX_PE0, TX_PE1, LOOPBACK
2
_______________________________________________________________________________________
Quad Copper-Cable Signal Conditioner
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
TX SECTION (CABLE DRIVER)
PC Board Input Swing
Input Resistance
Input Return Loss
Output Swing
Output Resistance
Output Return Loss
Output Transition Time
Random Jitter
t
r
, t
f
Measured differentially at the signal source
(Note 1)
TX_IN[1:4]+ to TX_IN[1:4]-, differential
100MHz to 2GHz (Note 1)
TX_ENABLE = high (Notes 1, 2)
TX_ENABLE = low
TX_OUT[1:4]+ or TX_OUT[1:4]- to V
CC
, single
ended
100MHz to 2GHz (Note 1)
20% to 80% (Notes 1, 3)
(Notes 1, 3)
TX_PE1
0
Output Preemphasis
See Figure 1
0
1
1
Source to
TX_IN
Residual Output Deterministic
Jitter at 2.5Gbps (Notes 1, 4, 5)
6-mil FR4
≤
20in
TX_OUT to
Load
1m, 28AWG
5m, 28AWG
10m, 24AWG
15m, 24AWG
Source to
TX_IN
Residual Output Deterministic
Jitter at 3.2Gbps (Notes 1, 4, 5)
6-mil FR4
≤
20in
TX_OUT to
Load
1m, 28AWG
5m, 28AWG
10m, 24AWG
15m, 24AWG
Signal-Detect Assert Level
Signal-Detect Off
RX SECTION (CABLE RECEIVER)
Cable Input Swing
Input Vertical Eye Opening
Input Resistance
Input Return Loss
Measured differentially at the signal source
(Note 1)
Measured differentially at the input of the
MAX3983 (Note 1)
RX_IN[1:4]+ to RX_IN[1:4]-, differential
100MHz to 2GHz (Note 1)
1000
175
85
10
100
18
1600
1600
115
mV
P-P
mV
P-P
Ω
dB
TX_IN for TX_SD = high (Note 6)
TX_IN for TX_SD = low (Note 6)
TX_PE0
0
1
0
1
TX_PE1 TX_PE0
0
0
1
1
0
1
0
1
0.10
0.15
UI
P-P
3
6
9
12
dB
42
10
50
13
80
1.6
800
85
10
1300
100
17
1500
1600
30
58
1600
115
mV
P-P
Ω
dB
mV
P-P
Ω
dB
ps
ps
RMS
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3983
TX_PE1 TX_PE0
0
0
1
1
0
1
0
1
800
200
mV
P-P
mV
P-P
0.15
0.20
UI
P-P
_______________________________________________________________________________________
3
Quad Copper-Cable Signal Conditioner
MAX3983
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
Output Swing
Output Resistance
Output Return Loss
Output Transition Time
Random Jitter
Output Preemphasis
t
r
, t
f
SYMBOL
CONDITIONS
RX_ENABLE = high (Notes 1, 7)
RX_ENABLE = low
RX_OUT[1:4]+ or RX_OUT[1:4]- to V
CC
, single
ended
100MHz to 2GHz (Note 1)
20% to 80% (Notes 1, 8)
(Notes 1, 8)
RX_PE = low
RX_PE = high
Source to
RX_IN
Residual Output Deterministic
Jitter at 2.5Gbps
(Notes 1, 5, 9, 10)
RX_OUT to
Load
RX_PE
3
6
42
10
50
15
45
80
1.6
MIN
1100
TYP
MAX
1500
30
58
UNITS
mV
P-P
Ω
dB
ps
ps
RMS
dB
5m, 28AWG
0in, 6-mil FR4
IB Cable
Assembly
without
20in, 6-mil FR4
preemphasis
Source to
RX_IN
RX_OUT to
Load
0
0.10
0.15
UI
P-P
1
RX_PE
Residual Output Deterministic
Jitter at 3.2Gbps
(Notes 1, 5, 9, 10)
5m, 28AWG
0in, 6-mil FR4
IB cable
assembly
without
20in, 6-mil FR4
preemphasis
RX_IN for RX_SD = high (Note 11)
RX_IN for RX_SD = low (Note 11)
0
0.15
0.20
UI
P-P
1
175
85
mV
P-P
mV
P-P
Signal-Detect Assert Level
Signal-Detect Off
END-TO-END JITTER (TX AND RX COMBINED PERFORMANCE)
RX_OUT to Load
TX_PE1
TX_PE0
Residual Output Deterministic
Jitter at 2.5Gbps
(Notes 1, 12, 13, 14)
Source to
TX_IN
TX_OUT to
RX_IN
RX_PE
0.15
0.20
UI
P-P
1m, 24AWG
6-mil FR4
≤
20in
15m, 24AWG
20m, 24AWG
0
1
1
0
1
1
0in
20in
20in
0
1
1
0.2
0.25
4
_______________________________________________________________________________________
Quad Copper-Cable Signal Conditioner
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
TX_OUT to RX_IN
RX_OUT to Load
MIN
TYP
MAX
UNITS
MAX3983
TX_PE1
TX_PE0
Residual Output Deterministic
Jitter at 3.2Gbps
(Notes 1, 12, 13, 14)
Source to
TX_IN
RX_PE
0.20
0.25
UI
P-P
6-mil FR4
≤
20 in
1m, 24AWG
15m, 24AWG
20m, 24AWG
0
1
1
0
1
1
5in
20in
20in
0
1
1
0.25
0.3
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
Note 6:
Note 7:
Note 8:
Note 9:
Note 10:
Note 11:
Note 12:
Note 13:
Note 14:
Guaranteed by design and characterization.
Measured with 2in of FR4 through InfiniBand connector with TX_PE1 = TX_PE0 =1.
Measured at the chip using 0000011111 or equivalent pattern. TX_PE1 = TX_PE0 = 0 for minimum preemphasis.
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).
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.
Tested with a 1GHz sine wave applied at TX_IN under test with less than 5in of FR4.
Measured with 3in of FR4 with RX_PE = 1.
Measured at the chip using 0000011111 or equivalent pattern. RX_PE = low (minimum). Signal source is 1V
P-P
with 5m,
28AWG InfiniBand cable.
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).
FR4 board material: 6-mil-wide, 100Ω, edge-coupled stripline (tanδ = 0.022, 4.0 <
ε
R
< 4.4).
Tested with a 1GHz sine wave applied at RX_IN under test with less than 5in of FR4.
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).
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.
Valid with pattern generator deterministic jitter as high as 0.17UI
P-P
.
_______________________________________________________________________________________
5
