MAX3518

PRODUCTION

DOCSIS 3.0 Upstream Amplifier

Industry's Lowest Power Upstream Amplifier for DOCSIS 3.0 Applications

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Overview

  • +5V Supply Voltage
  • Low Power: 1.25W at 31dB Gain, 64dBmV Output
  • Ultra-Low 25mW Dissipation in Transmit-Disable Mode
  • 63dB Gain Control Range in 1dB Steps
  • -60dBc Harmonic Distortion at 64dBmV Output
  • Small 5mm x 5mm Thin QFN Package
  • Low Burst On/Off Transient
  • 275MHz, 3dB Bandwidth

The MAX3518 is an integrated CATV upstream amplifier IC designed to meet the DOCSIS 3.0 requirements, while dissipating only 1.25W. The amplifier covers a 5MHz to 85MHz input frequency range (275MHz, 3dB bandwidth), and is capable of transmitting four QPSK modulated carriers, each at +58dBmV, simultaneously within this range. Both input and output ports are differential, requiring that an external balun be used at the output port. The gain is controlled in 1dB steps over a 63dB range using a SPI 3-wire interface.

The MAX3518 operates from a single +5V supply. Four power codes are provided to allow maximum supply current to be reduced as determined by distortion requirements. In addition, for each power code, supply current is automatically reduced as gain is reduced while maintaining distortion performance. For DOCSIS 3.0 applications, the MAX3518 draws 300mA at 33dB gain, dropping to 250mA at 31dB gain. The MAX3518 supply current drops to 5mA between bursts to minimize power dissipation in transmit-disable mode. Control logic levels are 3.3V CMOS.

The MAX3518 is available in a 20-pin thin QFN package, and operates over the extended industrial temperature range (-40°C to +85°C).

Applications

  • DOCSIS 3.0 Cable Modems
  • Set-Top Boxes
  • VOIP Modems
MAX3518
DOCSIS 3.0 Upstream Amplifier
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Documentation

Reliability Data 1

Technical Articles 1

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Software Resources

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Tools & Simulations

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Evaluation Kits

MAX3518EVKIT

Evaluation Kit for the MAX3518

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Features and Benefits

  • Easy Evaluation of the MAX3518
  • 50Ω SMA Connectors
  • All Critical Peripheral Components Included
  • Fully Assembled and Tested
  • PC Control Software (Available at www.maximintegrated.com)

Product Details

The MAX3518 evaluation kit (EV kit) simplifies the testing and evaluation of the MAX3518 DOCSIS 3.0 upstream amplifier. The EV kit is fully assembled and tested at the factory. Standard 50Ω SMA connectors are included on the EV kit for the inputs and outputs to allow quick and easy evaluation on the test bench.

This document provides a list of equipment required to evaluate the device, a straightforward test procedure to verify functionality, a description of the EV kit circuit, the circuit schematic, a list of components for the EV kit, and artwork for each layer of the PCB.

Applications

  • DOCSIS 3.0 Cable Modems
  • Set-Top Boxes
  • VOIP Modems
MAX3518EVKIT
Evaluation Kit for the MAX3518

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