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MAX3802
EVALUATION KIT AVAILABLE
3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver
General Description
The MAX3802 has four independent adaptive cable
equalizers and cable drivers on a single chip. It is
designed for coaxial and twin-axial cable point-to-point
scrambled-data communication applications. The driver
features differential current-mode logic (CML) inputs and
outputs. The equalizer includes differential CML data
inputs and outputs and a TTL loss-of-signal (LOS) output.
The adaptive cable equalizer can equalize differential or
single-ended signals at data rates up to 3.2Gbps. It auto-
matically adjusts to attenuation caused by skineffect loss-
es of 30dB at 1.6GHz. The equalizer effectively extends
the usable length of copper cable in high-frequency inter-
connect applications.
Applications
● High-Speed Links in Communications and Data
Systems
● Backplane and Twin-Axial Cable Interconnects
● Category 5 UTP-Based Systems
Pin Configuration appears at end of data sheet.
Typical Application Circuit
3.3V
Features
● Single 3.3V Operation
● Four Independent Equalizers and Drivers
● 725mW at 3.3V Typical Power Dissipation
● Data Rates Up to 3.2Gbps
● Equalizer Automatically Adjusts for Different Cable
Lengths
● 0 to 30dB Equalization at 1.6GHz (3.2Gbps)
● Loss-of-Signal (LOS) Indicator
● On-Chip Input and Output Terminations
● Low External Component Count
● 0°C to +85°C Operating Temperature Range
● ESD Protection on Cable Inputs and Outputs
Ordering Information
PART
TEMP RANGE
MAX3802UTK+
0°C to +85°C
PIN-PACKAGE
68 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
3.3V
EP* VCC
CARD 1
4
DIN_ DOUT_
MAX3802
4 EOUT_
EIN_
LOS_ RMOD_ CIM_
4 44
RMOD_
4
4
COAX, TWIN-AX, OR PC BOARD x 4
COAX, TWIN-AX, OR PC BOARD x 4
THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.
*EP MUST BE SOLDERED TO GROUND FOR
PROPER THERMAL AND ELECTRICAL PERFORMANCE.
EP* VCC
4 EIN_
EOUT_
4
MAX3802
CARD 2
4 DOUT_
DIN_ 4
LOS_ RMOD_ CIM_
4 44
RMOD_
19-2289; Rev 3; 10/14

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MAX3802
3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver
Absolute Maximum Ratings
Supply Voltage, VCC.............................................-0.5V to +6.0V
Voltage at LOS_, CIM_, and RMOD_....... -0.5V to (VCC + 0.5V)
Voltage at EIN_+, EIN_-,
DIN_+, and DIN_-..............................(VCC - 1V) to (VCC + 0.5V)
Current Out of EOUT_+, EOUT_-,
DOUT_+, and DOUT_-....................................................25mA
Continuous Power Dissipation (TA = +70°C)
68-Pin TQFN (derate 50mW/°C above +70°C)...................4W
Operating Ambient Temperature Range..................0°C to +85°C
Storage Ambient Temperature Range............... -55°C to +150°C
Lead Temperature (soldering, 10s).................................. +300°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.
DC Electrical Characteristics
(VCC = 3.14V to 3.46V, TA = 0°C to +85°C. Typical values are at VCC = 3.3V and TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
Supply Current
ICC
CABLE DRIVER INPUT SPECIFICATIONS
Includes external load current (Note 1)
220 345
Input Voltage
(Single Ended)
VDIN_+,
VDIN_-
VCC -
0.6
VCC +
0.2
Input Voltage (Differential)
Input Impedance
VDIN_
Single ended
400 1100
40 50 60
CABLE DRIVER OUTPUT SPECIFICATIONS
Output Voltage (Differential)
RMOD_ = 10kΩ (Note 2)
RMOD_ = 20kΩ (Note 2)
750 825 1000
400 445 550
Output Impedance
Single ended
50 62.5 75
CABLE EQUALIZER INPUT SPECIFICATIONS
Minimum Cable Input (Differential)
3.2Gbps, 30dB cable loss (Note 3)
400
Maximum Cable Input (Differential)
600
Input Impedance
40 50 60
CABLE EQUALIZER OUTPUT SPECIFICATIONS
Output Voltage (Differential)
(Note 2)
500 1000
Output Impedance
Single ended
50 62.5 75
Voltage at LOS_
Output high (Note 4)
Output low (Note 4)
2.4
0.4
UNITS
mA
V
mVP-P
mVP-P
mVP-P
mVP-P
mVP-P
V
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Maxim Integrated 2

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MAX3802
3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver
AC Electrical Characteristics
(VCC = 3.14V to 3.46V, TA = 0°C to +85°C. Typical values are at VCC = 3.3V and TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
Maximum Input Data Rate
CABLE DRIVER SPECIFICATIONS
Random Jitter
Deterministic Jitter
Output Edge Speed
Input Return Loss
(Differential)
CONDITIONS
3.2Gbps input
(Notes 6, 9)
20% to 80%
≤ 2.5GHz
MIN TYP MAX UNITS
3.2 Gbps
2.7 4 mUIRMS
20 60 mUIP-P
60 90
ps
-20 dB
Output Return Loss
(Differential)
EQUALIZER SPECIFICATIONS
Residual Jitter
(Notes 7, 9)
Output Edge Speed
Input Return Loss
(Differential)
≤ 2.5GHz
0dB cable loss (Note 8)
24dB cable loss (Note 8)
30dB cable loss (Note 8)
20% to 80%
≤ 2.5GHz
-13 dB
0.10
0.11
0.08
60
-16
0.24
0.20
0.20
90
UIP-P
ps
dB
Output Return Loss
(Differential)
≤ 2.5GHz
-14 dB
Equalizer Compensation
1.6GHz (skin-effect losses only)
30
dB
Equalizer Time Constant
(Note 10)
6 µs
Note 1: Equalizer total currents (equalizer with maximum equalization) and RMOD = 10kΩ (maximum driver swing).
Note 2: Input voltage within specification limits, 50Ω to VCC at each output.
Note 3: Minimum cable input for LOS_ to deassert high.
Note 4: 100kΩ load to ground. The minimum input signal level that turns off the LOS_ alarm depends on the data rate and cable
length.
Note 5: AC electrical characteristics are guaranteed by design and characterization.
Note 6: VDIN_ = 400mVP-P to 1100mVP-P (differential), 10kΩ ≤ RMOD_ ≤ 20kΩ, 3.2Gbps 213 -1 PRBS plus 100 consecutive ones
and 100 consecutive zeros.
Note 7: Includes random jitter and deterministic jitter for BER of 10-12.
Note 8: Differential cable input voltage = 400mVP-P, 3.2Gbps 213 -1 PRBS plus 100 consecutive ones and 100 consecutive zeros.
Note 9: Isolation test: three channels driven with identical 3.2Gbps PRBS with maximum input signal to each equalizer and maxi-
mum input signal on driver. The measured channel meets the residual and random jitter specifications with an uncorre-
lated 3.2Gbps PRBS data at minimum input signal level on equalizer and maximum signal level on driver.
Note 10: Equalizer time constant measured from data on to closed-loop operation.
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Maxim Integrated 3

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MAX3802
3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver
Typical Operating Characteristics
(VCC = 3.3V, TA = +25°C, all jitter measurements done at 3.2Gbps, 600mV cable input with 213 - 1 PRBS pattern with 100 consecutive
ones and 100 consecutive zeros substituted. Note: Test pattern produces near-worst-case jitter results. Results vary with pattern, un-
less otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
300
RMOD = 15k
ALL CHANNELS AT
270 MAX EQUALIZATION
240
210
180
150
-10
10 30 50 70
TEMPERATURE (°C)
90
CABLE DRIVER OUTPUT vs. RMOD
1300
1200
1100
1000
900
800
700
600
500
400
4
7 10 13 16 19 22
RMOD (k)
DRIVER OUTPUT RETURN LOSS (S22)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0
0.8 1.6 2.4 3.2
FREQUENCY (GHz)
4.0
EQUALIZER RESIDUAL JITTER vs. POWER-SUPPLY
NOISE (100mVP-P SINE WAVE) (40ft OF TENSOLITE
TWIN-AX, 400mVP-P DIFFERENTIAL INPUT)
95
85
75
65
55
45
0.001
0.01 0.1 1 10
NOISE FREQUENCY (MHz)
100
EQUALIZER INPUT RETURN LOSS (S11)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0
0.8 1.6 2.4 3.2
FREQUENCY (GHz)
4.0
EQUALIZER RESIDUAL JITTER vs. CABLE
INPUT AMPLITUDE (RG179B 75Ω COAXIAL
CABLE, SINGLE ENDED)
125
115
105
25ft
95
85 72ft
75
65
55
45
150
300 450 600 750 900
CABLE INPUT AMPLITUDE (mVP-P)
DRIVER INPUT RETURN LOSS (S11)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0
0.8 1.6 2.4 3.2
FREQUENCY (GHz)
4.0
EQUALIZER OUTPUT RETURN LOSS (S22)
50
40
30
20
10
0
-10
-20
-30
-40
-50
0
0.8 1.6 2.4 3.2
FREQUENCY (GHz)
4.0
EQUALIZER RESIDUAL JITTER vs. CABLE
INPUT AMPLITUDE (TENSOLITE
TWIN-AX–DIFFERENTIAL)
105
95
85
75 70ft
65
55 10ft 40ft
45
35
300 450 600 750 900 1050 1200
CABLE DIFFERENTIAL INPUT AMPLITUDE (mVP-P)
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Maxim Integrated 4

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MAX3802
3.2Gbps Quad Adaptive Cable Equalizer
with Cable Driver
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25°C, all jitter measurements done at 3.2Gbps, 600mV cable input with 213 - 1 PRBS pattern with 100 consecutive
ones and 100 consecutive zeros substituted. Note: Test pattern produces near-worst-case jitter results. Results vary with pattern, un-
less otherwise noted.)
EQUALIZER RESIDUAL JITTER vs. CABLE
LENGTH (TENSOLITE TWIN-AX, 400mVP-P
DIFFERENTIAL INPUT)
85
EQUALIZER RESIDUAL JITTER vs. CABLE
LENGTH (RG179B 75COAXIAL, 300mVP-P
SINGLE ENDED)
90
EQUALIZER RESIDUAL JITTER vs. LINE
LENGTH (FR-4 6mil STRIPLINE, 300mVP-P
SINGLE ENDED)
100
75
65
3.2Gbps
55
45
2.5Gbps
35
25
10
622Mbps
20 30 40 50 60
CABLE LENGTH (ft)
70
CIM VOLTAGE vs. CABLE LENGTH (TENSOLITE
TWIN-AX, 400mVP-P DIFFERENTIAL)
0.30
80
70
3.2Gbps
60
50
40
25
2.5Gbps
622Mbps
35 45
55
CABLE LENGTH (ft)
65
EQUALIZER INPUT AFTER 115ft OF
CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
90
80
70 3.2Gbps
60 2.5Gbps
50
40
40
622Mbps
50 60 70 80
LINE LENGTH (in)
90
EQUALIZER OUTPUT EYE DIAGRAM AFTER
155ft OF 50GORE-89 CABLE (400mVP-P)
0.25
0.20
0.15
0.10
0.05
0
10 20 30 40 50 60
70
CABLE LENGTH (ft)
CABLE OUTPUT EYE DIAGRAM AFTER 70ft
OF TENSOLITE TWIN-AX CABLE (27 - 1 PRBS
NO EQUALIZATION)
48ps/div (3.2Gbps)
EQUALIZER OUTPUT EYE DIAGRAM AFTER 70ft
OF TENSOLITE TWIN-AX CABLE (27 - 1 PRBS)
EQUALIZER OUTPUT EYE DIAGRAM AFTER 72ft
OF 75RG179 CABLE
(300mVP-P SINGLE ENDED, 223 - 1 PRBS)
60ps/div (2.5Gbps)
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60ps/div (2.5Gbps)
48ps/div (3.2Gbps)
Maxim Integrated 5