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19-2289; Rev 0; 1/02
KIT ATION EVALU ABLE AVAIL
3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver
General Description Features
o Single 3.3V Operation o Four Independent Equalizers and Drivers o 725mW at 3.3V Typical Power Dissipation o Data Rates Up to 3.2Gbps o Equalizer Automatically Adjusts for Different Cable Lengths o 0 to 30dB Equalization at 1.6GHz (3.2Gbps) o Loss-of-Signal (LOS) Indicator o On-Chip Input and Output Terminations o Low External Component Count o 0C to +85C Operating Temperature Range o ESD Protection on Cable Inputs and Outputs
MAX3802
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 automatically adjusts to attenuation caused by skineffect losses of 30dB at 1.6GHz. The equalizer effectively extends the usable length of copper cable in high-frequency interconnect applications.
Applications
High-Speed Links in Communications and Data Systems Backplane and Twin-Axial Cable Interconnects Category 5 UTP-Based Systems Digital Video Systems
Pin Configuration appears at end of data sheet.
Ordering Information
PART MAX3802UGK TEMP RANGE 0C to +85C PIN-PACKAGE 68 QFN*
*Exposed pad
Typical Application Circuit
3.3V 3.3V
EP* DIN_
VCC DOUT_ MAX3802 4 COAX, TWIN-AX, OR PC BOARD x 4 4
EP* EIN_
VCC EOUT_ MAX3802 4 CARD 2 DIN_ RMOD_ 4 CIM_ 4 4
4 CARD 1 4
EOUT_ LOS_ 4 RMOD_ 4
EIN_ CIM_ 4 RMOD_
4
COAX, TWIN-AX, OR PC BOARD x 4
4
DOUT_ LOS_ 4
RMOD_
THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE. *EP MUST BE SOLDERED TO GROUND FOR PROPER THERMAL AND ELECTRICAL PERFORMANCE.
________________________________________________________________ Maxim Integrated Products
1
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
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 = +85C) 68-Pin QFN (derate 44.8mW/C above +85C) .............1.44W Operating Ambient Temperature Range ................0C to +85C Storage Ambient Temperature Range...............-55C to +150C Lead Temperature (soldering, 10s) .................................+300C
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 = 0C to +85C. Typical values are at VCC = 3.3V and TA = +25C, unless otherwise noted.)
PARAMETER Supply Current SYMBOL ICC VDIN_+, VDIN_VDIN_ Single ended RMOD_ = 10k (Note 2) RMOD_ = 20k (Note 2) Single ended CONDITIONS Includes external load current (Note 1) VCC 0.6 400 40 750 400 50 50 825 445 62.5 MIN TYP 220 MAX 345 VCC + 0.2 1100 60 1000 550 75 UNITS mA
CABLE DRIVER INPUT SPECIFICATIONS Input Voltage (Single Ended) Input Voltage (Differential) Input Impedance CABLE DRIVER OUTPUT SPECIFICATIONS Output Voltage (Differential) Output Impedance CABLE EQUALIZER INPUT SPECIFICATIONS Minimum Cable Input (Differential) Maximum Cable Input (Differential) Input Impedance CABLE EQUALIZER OUTPUT SPECIFICATIONS Output Voltage (Differential) Output Impedance Voltage at LOS_ (Note 2) Single ended Output high (Note 4) Output low (Note 4) 500 50 2.4 0.4 62.5 1000 75 mVP-P V 40 3.2Gbps, 30dB cable loss (Note 3) 600 50 60 400 mVP-P mVP-P mVP-P V mVP-P
2
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver
AC ELECTRICAL CHARACTERISTICS
(VCC = 3.14V to 3.46V, TA = 0C to +85C. Typical values are at VCC = 3.3V and TA = +25C, unless otherwise noted.)
PARAMETER Maximum Input Data Rate CABLE DRIVER SPECIFICATIONS Random Jitter Deterministic Jitter Output Edge Speed Input Return Loss (Differential) Output Return Loss (Differential) EQUALIZER SPECIFICATIONS 0dB cable loss (Note 8) Residual Jitter (Notes 7, 9) Output Edge Speed Input Return Loss (Differential) Output Return Loss (Differential) Equalizer Compensation Equalizer Time Constant 24dB cable loss (Note 8) 30dB cable loss (Note 8) 20% to 80% 2.5GHz 2.5GHz 1.6GHz (skin-effect losses only) (Note 10) 30 6 0.10 0.11 0.08 60 -16 -14 0.24 0.20 0.20 90 ps dB dB dB s UIP-P 3.2Gbps input (Notes 6, 9) 20% to 80% 2.5GHz 2.5GHz 2.7 20 60 -20 -13 4 60 90 mUIRMS mUIP-P ps dB dB SYMBOL CONDITIONS MIN 3.2 TYP MAX UNITS Gbps
MAX3802
Note 1: Note 2: Note 3: Note 4: Note 5: Note 6:
Equalizer total currents (equalizer with maximum equalization) and RMOD = 10k (maximum driver swing). Input voltage within specification limits, 50 to VCC at each output. Minimum cable input for LOS_ to deassert high. 100k load to ground. The minimum input signal level that turns off the LOS_ alarm depends on the data rate and cable length. AC electrical characteristics are guaranteed by design and characterization. VDIN_ = 400mVP-P to 1100mVP-P (differential), 10k RMOD_ 20k, 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 maximum input signal on driver. The measured channel meets the residual and random jitter specifications with an uncorrelated 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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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
Typical Operating Characteristics
(VCC = 3.3V, TA = +25C, 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, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
RMOD = 15k ALL CHANNELS AT MAX EQUALIZATION
MAX3802 toc01
CABLE DRIVER OUTPUT vs. RMOD
MAX3802 toc02
DRIVER INPUT RETURN LOSS (S11)
40 30 20 GAIN (dB) 10 0 -10 -20 -30 -40 -50
MAX3802 toc03
300
1300 1200 DRIVER OUTPUT VOLTAGE (mV) 1100 1000 900 800 700 600 500
50
270 SUPPLY CURRENT (mA)
240
210
180
150 -10 10 30 50 70 90 TEMPERATURE (C)
400 4 7 10 13 RMOD (k) 16 19 22
0
0.8
1.6
2.4
3.2
4.0
FREQUENCY (GHz)
DRIVER OUTPUT RETURN LOSS (S22)
MAX3802 toc04
EQUALIZER INPUT RETURN LOSS (S11)
MAX3802 toc05
EQUALIZER OUTPUT RETURN LOSS (S22)
40 30 20 GAIN (dB) 10 0 -10 -20 -30 -40 -50
MAX3802 toc06
50 40 30 20 GAIN (dB)
50 40 30 20 GAIN (dB) 10 0 -10 -20 -30 -40 -50
50
10 0 -10 -20 -30 -40 -50 0 0.8 1.6 2.4 3.2 4.0 FREQUENCY (GHz)
0
0.8
1.6
2.4
3.2
4.0
0
0.8
1.6
2.4
3.2
4.0
FREQUENCY (GHz)
FREQUENCY (GHz)
EQUALIZER RESIDUAL JITTER vs. POWER-SUPPLY NOISE (100mVP-P SINE WAVE) (40ft OF TENSOLITE TWIN-AX, 400mVP-P DIFFERENTIAL INPUT)
MAX3802 toc07
EQUALIZER RESIDUAL JITTER vs. CABLE INPUT AMPLITUDE (RG179B 75 COAXIAL CABLE, SINGLE ENDED)
MAX3802 toc08
EQUALIZER RESIDUAL JITTER vs. CABLE INPUT AMPLITUDE (TENSOLITE TWIN-AX-DIFFERENTIAL)
MAX3802 toc09
95
125 115 105 25ft JITTER (psP-P) 95 85 75 65 72ft
105 95 85 JITTER (psP-P) 75 65 10ft 55 45 35 40ft 70ft
85 JITTER (psP-P)
75
65
55 55 45 0.001 45 0.01 0.1 1 10 100 150 300 450 600 750 900 NOISE FREQUENCY (MHz) CABLE INPUT AMPLITUDE (mVP-P)
300
450
600
750
900
1050
1200
CABLE DIFFERENTIAL INPUT AMPLITUDE (mVP-P)
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25C, 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, unless otherwise noted.)
EQUALIZER RESIDUAL JITTER vs. CABLE LENGTH (TENSOLITE TWIN-AX, 400mVP-P DIFFERENTIAL INPUT)
MAX3802 toc10
EQUALIZER RESIDUAL JITTER vs. CABLE LENGTH (RG179B 75 COAXIAL, 300mVP-P SINGLE ENDED)
MAX3802 toc11
EQUALIZER RESIDUAL JITTER vs. LINE LENGTH (FR-4 6mil STRIPLINE, 300mVP-P SINGLE ENDED)
MAX3802 toc12
85 75 65 55 45 35 622Mbps 25 10 20 30 40 50 60 3.2Gbps
90
100 90 80 70 60 3.2Gbps
80 JITTER (psP-P)
JITTER (psP-P)
70 3.2Gbps 60 2.5Gbps 50 622Mbps 40
JITTER (psP-P)
2.5Gbps
2.5Gbps 622Mbps
50 40 25 35 45 55 65 40 50 60 70 80 90 CABLE LENGTH (ft) LINE LENGTH (in)
70
CABLE LENGTH (ft)
CIM VOLTAGE vs. CABLE LENGTH (TENSOLITE TWIN-AX, 400mVP-P DIFFERENTIAL)
MAX3802 toc13
EQUALIZER INPUT AFTER 115ft OF CABLE (TOP) EQUALIZER OUTPUT (BOTTOM)
MAX3802 toc14
EQUALIZER OUTPUT EYE DIAGRAM AFTER 155ft OF 50 GORE-89 CABLE (400mVP-P)
MAX3802 toc15
0.30 CIM VOLTAGE (VCC - VCIM) (V) 0.25 0.20 0.15 0.10 0.05 0 10 20 30 40 50 60
70
48ps/div (3.2Gbps)
CABLE LENGTH (ft)
CABLE OUTPUT EYE DIAGRAM AFTER 70ft OF TENSOLITE TWIN-AX CABLE (27 - 1 PRBS NO EQUALIZATION)
MAX3802 toc16
EQUALIZER OUTPUT EYE DIAGRAM AFTER 70ft OF TENSOLITE TWIN-AX CABLE (27 - 1 PRBS)
MAX3802 toc17
EQUALIZER OUTPUT EYE DIAGRAM AFTER 72ft OF 75 RG179 CABLE (300mVP-P SINGLE ENDED, 223 - 1 PRBS)
MAX3802 toc18
60ps/div (2.5Gbps)
60ps/div (2.5Gbps)
48ps/div (3.2Gbps)
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
Typical Operating Characteristics (continued)
(VCC = 3.3V, TA = +25C, 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, unless otherwise noted.)
EQUALIZER OUTPUT EYE DIAGRAM AFTER 60in OF FR-4 6mil STRIPLINE (DIFFERENTIAL, 27 - 1 PRBS)
MAX3802 toc19
EQUALIZER OUTPUT EYE DIAGRAM AFTER 288ft OF RG59 CABLE (300mVP-P SINGLE ENDED, 223 - 1 PRBS)
MAX3802 toc20
EQUALIZER OUTPUT EYE DIAGRAM AFTER 50ft OF MADISON 14887 SHIELDED TWISTED-PAIR CABLE (27 - 1 PRBS)
MAX3802 toc21
60ps/div (2.5Gbps)
60ps/div (2.5Gbps)
60ps/div (2.5Gbps)
Pin Description
PIN 1, 4, 6, 9 2 3 5 7 8 10 11, 14 12 13 15 16 17 18, 21, 23, 26 19 20 22 24 25 27 28, 31 29 30 NAME VCCE1 EIN1EIN1+ CIM1 EOUT1EOUT1+ RMOD1 VCCD1 DOUT1DOUT1+ DIN1DIN1+ LOS1 VCCE2 EIN2EIN2+ CIM2 EOUT2EOUT2+ RMOD2 VCCD2 DOUT2DOUT2+ 3.3V Supply Voltage for Equalizer 1 Negative Equalizer 1 Input, CML Positive Equalizer 1 Input, CML Cable Integrity Monitor 1 Output Negative Equalizer 1 Output, CML Positive Equalizer 1 Output, CML Driver 1 Output Modulation Adjust 3.3V Supply Voltage for Driver 1 Negative Driver 1 Output, CML Positive Driver 1 Output, CML Negative Driver 1 Input, CML Positive Driver 1 Input, CML Equalizer 1 Loss-of-Signal, TTL, Active Low 3.3V Supply Voltage for Equalizer 2 Negative Equalizer 2 Input, CML Positive Equalizer 2 Input, CML Cable Integrity Monitor 2 Output Negative Equalizer 2 Output, CML Positive Equalizer 2 Output, CML Driver 2 Output Modulation Adjust 3.3V Supply Voltage for Driver 2 Negative Driver 2 Output, CML Positive Driver 2 Output, CML FUNCTION
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver
Pin Description (continued)
PIN 32 33 34 35, 38, 40, 43 36 37 39 41 42 44 45, 48 46 47 49 50 51 52, 55, 57, 60 53 54 56 58 59 61 62, 65 63 64 66 67 68 EP NAME DIN2DIN2+ LOS2 VCCE3 EIN3EIN3+ CIM3 EOUT3EOUT3+ RMOD3 VCCD3 DOUT3DOUT3+ DIN3DIN3+ LOS3 VCCE4 EIN4EIN4+ CIM4 EOUT4EOUT4+ RMOD4 VCCD4 DOUT4DOUT4+ DIN4DIN4+ LOS4 Exposed Pad Negative Driver 2 Input, CML Positive Driver 2 Input, CML Equalizer 2 Loss-of-Signal, TTL, Active Low 3.3V Supply Voltage for Equalizer 3 Negative Equalizer 3 Input, CML Positive Equalizer 3 Input, CML Cable Integrity Monitor 3 Output Negative Equalizer 3 Output, CML Positive Equalizer 3 Output, CML Driver 3 Output Modulation Adjust 3.3V Supply Voltage for Driver 3 Negative Driver 3 Output, CML Positive Driver 3 Output, CML Negative Driver 3 Input, CML Positive Driver 3 Input, CML Equalizer 3 Loss-of-Signal, TTL, Active Low 3.3V Supply Voltage for Equalizer 4 Negative Equalizer 4 Input, CML Positive Equalizer 4 Input, CML Cable Integrity Monitor 4 Output Negative Equalizer 4 Output, CML Positive Equalizer 4 Output, CML Driver 4 Output Modulation Adjust 3.3V Supply Voltage for Driver 4 Negative Driver 4 Output, CML Positive Driver 4 Output, CML Negative Driver 4 Input, CML Positive Driver 4 Input, CML Equalizer 4 Loss-of-Signal, TTL, Active Low Ground. Must be soldered to the circuit board ground for proper thermal and electrical performance (see EP Package). FUNCTION
MAX3802
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
Detailed Description
The MAX3802 has four independent adaptive equalizers (receivers) and four independent drivers. Disconnecting the power pins of unused equalizers and drivers lowers the power consumption of the MAX3802. Equalizer and driver descriptions apply to the four identical sections. to 3.2Gbps. It automatically adjusts to attenuation levels of 30dB at 1.6GHz (due to skin-effect losses in copper cable). The equalizer consists of a CML input buffer, a flat-response amplifier, a skin-effect compensation amplifier, a current-steering network, a dual power-detector feedback loop, an output limiting amplifier, and a CML output buffer (Figure 1). General Theory of Operation The shape of the power spectrum of a random bit stream can be described by the square of the wellknown sinc function, where sinc(f) = sin(f)/(f) for f 0. For sufficiently long bit patterns (nonrandom bit stream), sinc2(f) is a good approximation. From the shape of the sinc2(f) function, the ratio of the power densities at any two frequencies can be estimated. The MAX3802 adaptive equalizer employs this principle by incorporating a feedback loop that continuously monitors the power at high- and low-frequency bands and
Cable Driver
The cable driver accepts differential or single-ended CML input data at rates up to 3.2Gbps. The maximum CML output of the driver can be adjusted over a typical range of 445mV to 825mV by changing the value of the RMOD_ resistor between 10k and 20k (resistor connected between RMOD_ pin and ground).
Adaptive Cable Equalizer
The adaptive cable equalizer is capable of equalizing differential or single-ended CML input data at rates up
MAX3802
200MHz PWR DETECTOR |H(f)| LOOP FILTER 600MHz PWR DETECTOR LIMITING AMP
FLAT RESPONSE AMP EIN_ CML SKINEFFECT COMP AMP |H(f)|
VARIABLE ATTENUATOR
2
VARIABLE ATTENUATOR CURRENT-STEERING NETWORK
CML
2
EOUT_
POWER DETECTOR LOS_
f
2 CML CABLE DRIVER CML 2 DIN_
DOUT_
RMOD_
RMOD_
Figure 1. MAX3802 Functional Diagram 8 _______________________________________________________________________________________
3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver
dynamically adjusts the equalizer to maintain the correct power ratio. CML Input and Output Buffers The input and output buffers are implemented using CML. Equivalent circuits are shown in Figures 2 and 3. For details on interfacing with CML, refer to Maxim Application Note HFAN-01.0, Interfacing Between CML, PECL, and LVDS. Flat-Response and Skin-Effect Compensation Amplifiers The buffered input waveform is fed equally to two amplifiers--the flat-response amplifier and the skineffect compensation amplifier. The flat-response amplifier has a constant gain over the entire frequency range of the device, and the skin-effect compensation amplifier has a gain characteristic that approximates the inverse of the skin-effect attenuation in copper cable. The skin-effect attenuation, in dB per unit length, is proportional to the square root of the frequency. The output currents from the amplifiers are supplied to the current-steering network. Current-Steering Network The function of the current-steering network is to combine adjustable quantities of the output currents from the flat-response and skin-effect compensation amplifiers in order to achieve a desired current ratio. The ratio adjustment is controlled by the dual power-detector feedback loop. The current-steering network is implemented with a pair of variable attenuators that feed into a current-summing node. The variable attenuators are used to attenuate the output currents of the flat-response and skin-effect compensation amplifiers under control of the dual power-detector feedback loop. The outputs of the two attenuators are combined at the summing node and then fed to the output-limiting amplifier and the feedback loop. Dual Power-Detector Feedback Loop The outputs of the current-steering network are applied to the inputs of 200MHz and 600MHz power detectors. The outputs of the power detectors are applied to the loop-filter amplifier. This amplifier controls the variable attenuators in the current-steering network. Output Limiting Amplifier The output limiting amplifier amplifies the signal from the current-steering network to achieve the specified output voltage swing.
MAX3802
VCC
MAX3802
50 _IN_+
50
_IN_-
ESD STRUCTURES
Figure 2. CML Input Structure
VCC
MAX3802
62.5 62.5
ESD STRUCTURES
_OUT_+ _OUT_-
Applications Information
Refer to Maxim Application Note HFDN-10.0, Equalizing Gigabit Copper Cable Links with the MAX3800 (available at www.maxim-ic.com) for additional application information.
Figure 3. CML Output Structure
Selecting RMOD The cable driver output amplitude can be adjusted by connecting a resistor (RMOD) with a value from 10k to 20k between the RMOD_ pin and ground. The exact output amplitude of the driver is dependent on several
9
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3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
factors. See the Typical Operating Characteristics Cable Driver Output Voltage vs. RMOD for typical values.
Exposed-Pad Package
The EP on the 68-pin QFN provides a very low thermal resistance path for heat removal from the IC. The pad is the electrical ground on the MAX3802 and must be soldered to the circuit board ground for proper thermal and electrical performance. Refer to Maxim Application Note HFAN-08.1, Thermal Considerations for QFN and Other Exposed-Pad Packages (available at www.maximic.com) for additional application information.
Cable Integrity Monitor
The CIM_ output voltage is directly proportional to the output current of the loop amplifier (which controls the current-steering network; see Detailed Description). This is an analog voltage output that indicates the amount of equalization being applied. The amount of equalization (and thus the CIM_ output level) is affected by cable type, cable length, signal bandwidth, etc. See the Typical Operating Characteristics CIM Voltage vs. Cable Length for typical values under specific conditions.
Chip Information
TRANSISTOR COUNT: 5408 PROCESS: Bipolar (silicon germanium)
Loss-of-Signal (LOS_) Output
Loss of signal is indicated by the LOS_ output. A low level on LOS_ indicates that the equalizer input power has dropped below a threshold. When there is sufficient input voltage to the channel (typically greater than 250mV), LOS_ is high. The LOS_ output is suitable for indicating problems with the transmission link caused by, for example, a broken cable or a defective driver.
Pin Configuration
DOUT4EOUT4+ RMOD4 EOUT4VCCD4 VCCD4 VCCE4 VCCE4 VCCE4 VCCE4
51 LOS3 50 DIN3+ 49 DIN348 VCCD3 47 DOUT3+ 46 DOUT345 VCCD3 44 RMOD3 43 VCCE3 42 EOUT3+ 41 EOUT340 VCCE3 39 CIM3 38 VCCE3 37 EIN3+ 36 EIN335 VCCE3 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34
DIN4+
DIN4-
EIN4+ DIN2-
Data Spectrum for Equalizer
The MAX3802 equalizer design requires the data stream be scrambled or coded to provide a rich frequency spectrum for the adaptation algorithm. Scrambled patterns or coded patterns with scrambled content, such as 64b/66b or SONET PRBS, are ideal. Some coded patterns, such as 8b/10b, lack low-frequency energy and can be nonoptimal, requiring the user to characterize the specific application. In the absence of an input signal (nonstandard application), amplified noise may appear at the output due to the large gain of the device.
VCCE1 EIN1EIN1+ VCCE1 CIM1 VCCE1 EOUT1EOUT1+ VCCE1
1 2 3 4 5 6 7 8 9
68
67 66 65 64
63 62 61 60 59 58
57 56 55 54 53 52
MAX3802
RMOD1 10 VCCD1 11 DOUT1- 12 DOUT1+ 13 VCCD1 14 DIN1- 15 DIN1+ 16 LOS1 17
Single-Ended Operation
For single-ended operation of the cable driver or equalizer, connect the unused input to ground through a series combination of a capacitor (of equal value to other AC-coupling capacitors) and a 50 resistor. Note that the MAX3802 is specified for differential operation.
EIN2-
EIN2+
CIM2
EOUT2-
EOUT2+
RMOD2
DOUT2-
CIM4
DOUT2+
DIN2+
EIN4-
LOS4
TOP VIEW
DOUT4+
VCCE2
VCCE2
VCCE2
VCCE2
VCCD2
Layout Considerations
The MAX3802's performance can be significantly affected by circuit board layout and design. Use good high-frequency design techniques, including minimizing ground inductance and using controlled-impedance transmission lines for the high-frequency data signals. Power-supply decoupling capacitors should be placed as close as possible to VCC.
QFN*
*THE EXPOSED PAD OF THE QFN PACKAGE MUST BE SOLDERED TO GROUND FOR PROPER THERMAL AND ELECTRICAL OPERATION OF THE MAX3802.
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VCCD2
LOS2
3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver
Package Information
68L QFN, 10x10x09,EPS
______________________________________________________________________________________ 11
MAX3802
3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver MAX3802
Package Information (continued)
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
12 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2002 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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