DOCSIS 3.0 Upstream Amplifier

Industry's Lowest Power Upstream Amplifier for DOCSIS 3.0 Applications

Please check latest availability status for a specific part variant.


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).

Key Features

  • +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


  • DOCSIS 3.0 Cable Modems
  • Set-Top Boxes
  • VOIP Modems
Part NumberSolutionsPOUT
Frequency Range
(mm x mm)
See Notes
MAX3518 Cable Modems705 to 1202905.0 x 5.0
$1.60 @1k
See All Broadband RF Transmitters (2)

Part NumberApplicationsOper. Temp.
Set-Top Boxes
VOIP Modems
-40 to +85
See All TV Tuners (8)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX3518EVKIT: Evaluation Kit for the MAX3518

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs

Quality and Environmental Data

Product Reliability Reports: MAX3518.pdf 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >


Related Resources

Ultra-Wideband, Direct-Conversion, L-Band Satellite Tuner

  • 925MHz to 2175MHz Frequency Range
  • Monolithic VCO
  • High Dynamic Range: -75dBm to 0dBm