Datasheet

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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

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

Pin Configuration appears at end of data sheet.

19-2289; Rev 3; 10/14

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX3802UTK+ 0°C to +85°C 68 TQFN-EP*

DOUT_

EIN_

DIN_

EOUT_

DOUT_

EIN_

DIN_

THIS SYMBOL INDICATES A CONTROLLED-IMPEDANCE TRANSMISSION LINE.

EOUT_

RMOD_

CIM_

CARD 2

CARD 1

3.3V

LOS_

RMOD_

CIM_

LOS_

EP* V

4 4 4

MOD_

COAX, TWIN-AX, OR PC BOARD x 4

*EP MUST BE SOLDERED TO GROUND FOR

PROPER THERMAL AND ELECTRICAL PERFORMANCE.

3.3V

EP* V

MOD

4 4 4

MAX3802MAX3802

MAX3802 3.2Gbps Quad Adaptive Cable Equalizer

with Cable Driver

Typical Application Circuit

Ordering Information

EVALUATION KIT AVAILABLE

Summary of content (12 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX3802 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.
PAGE 2
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_-....................................................
PAGE 3
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 CONDITIONS Maximum Input Data Rate MIN TYP MAX 3.2 UNITS Gbps CABLE DRIVER SPECIFICATIONS Random Jitter 3.2Gbps input 2.7 4 Deterministic Jitter (Notes 6, 9) 20 60 mUIRMS Output Edge Speed 20% to 80% 60 90 Input Return Loss (Differential) ≤ 2.
PAGE 4
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, unless otherwise noted.
PAGE 5
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, unless otherwise noted.) 45 2.5Gbps 50 10 20 30 40 50 60 70 40 25 35 80 3.2Gbps 70 60 2.
PAGE 6
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, unless otherwise noted.) 60ps/div (2.
PAGE 7
MAX3802 3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver Pin Description (continued) PIN NAME 32 DIN2- Negative Driver 2 Input, CML 33 DIN2+ Positive Driver 2 Input, CML 34 LOS2 Equalizer 2 Loss-of-Signal, TTL, Active Low 35, 38, 40, 43 VCCE3 3.
PAGE 8
MAX3802 3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver Detailed Description 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).
PAGE 9
MAX3802 3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver frequency bands and dynamically adjusts the equalizer to maintain the correct power ratio. Flat-Response and Skin-Effect Compensation Amplifiers CML Input and Output Buffers The buffered input waveform is fed equally to two amplifiers—the flat-response amplifier and the skineffect compensation amplifier.
PAGE 10
MAX3802 See the Typical Operating Characteristics Cable Driver Output Voltage vs. RMOD for typical values. 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.
PAGE 11
MAX3802 3.2Gbps Quad Adaptive Cable Equalizer with Cable Driver Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE DOCUMENT NO. LAND PATTERN NO. 68 TQFN-EP T6800+4 21-0142 90-0101 www.
PAGE 12
MAX3802 3.