MAX3987

Obsolete

8.5Gbps Quad Equalizer and Preemphasis Driver

Best-in-Class Redriver Can Equalize 25in to 30in of FR4

Data Sheet (Rev. 2) Product Selection Table
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Overview

  • Up to 8.5 NRZ Data Speed
  • Receive Equalization Up to 30in FR4
  • Preemphasis Drive Up to 30in FR4
  • Global and Individual Programming of Preemphasis, Output Drive Levels, Polarity Inversion, and Offset Cancellation
  • Signal Detect and Internal Output Squelch
  • Compliant with SAS-2 and SATA Revision 3 OOB
  • Coding Independent, 8B/10B, 64B/66B, Scrambled, and Others
  • Differential CML Data-Output Drive
  • I²C Serial Interface and Pin Programmable
  • Software Power-Down of Unused Outputs
  • 0.5W Typical Power Dissipation for Drive Level 1 at VCC = 2.5V
  • High-Performance, Lead-Free, 7mm x 7mm, 48-Pin TQFN Package

The MAX3987 is a 4-channel receive and transmit equalizer (EQ). It compensates for transmission medium losses encountered with FR4 stripline/microstrip and/or high-speed cable. The device can be used at the beginning, middle, or end of a channel. The input equalization requires no setting, and the output preemphasis (PE) is programmable.

For each channel, the preemphasis level, output drive level, output polarity, and powering down of unused outputs are programmable through an I²C serial interface. It can also be configured globally through pins.

The device operates from a 2.5V or 3.3V supply, and is packaged in a 7mm x 7mm, 48-pin TQFN.

Applications

  • FR4 and Cable Equalization
  • PCIe® Compatible
  • Preemphasis and Receive Equalization
  • Redrive
  • XAUI and XAUI2, Fibre Channel, Interlaken, InfiniBandTM/SM, SAS-2 and SATA Revision 3 OOB
MAX3987
8.5Gbps Quad Equalizer and Preemphasis Driver
MAX3987: Typical Application Circuit
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Documentation

Data Sheet 1

Reliability Data 1

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Evaluation Kits

MAX3987EVKIT

Evaluation Kit for the MAX3987

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Features and Benefits

  • SMA Connectors for Inputs and Outputs
  • Controlled Impedance and Matched Length Input and Output Signal Traces
  • Software- or Hardware-Controlled Operation
  • Windows Software Provides Point-and-Click Access to MAX3987 Features
  • Silkscreen Labels Identify All Signal Traces, Connectors, Jumpers, and LEDs
  • Power Through USB or External 5V Supply

Product Details

The MAX3987 evaluation kit (EV kit) is a fully assembled and tested PCB that demonstrates the capabilities of the MAX3987 8.5Gbps quad equalizer and preemphasis driver. The EV kit can be controlled using a PC to run the evaluation software or using DIP switches mounted on the EV kit to bias hardware pins. The included software is Windows® compatible and provides a simple graphical user interface (GUI) to configure all available device features. The software communicates with the EV kit through a USB port and provides three methods for configuration. The primary method is a simple point-and-click interface. The other debug interfaces allow direct register read/write operations, or software-controlled external pin programming. The data I/O traces on the EV kit are controlled impedance with matched lengths. All external connections are AC-coupled with standard SMA connectors for easy connection to test equipment.

Applications

  • FR4 and Cable Equalization
  • PCIe® Compatible
  • Preemphasis and Receive Equalization
  • Redrive
  • XAUI and XAUI2, Fibre Channel, Interlaken, InfiniBandTM/SM, SAS-2 and SATA Revision 3 OOB
MAX3987EVKIT
Evaluation Kit for the MAX3987

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