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AD8327:  5 V CATV Line Driver Coarse Step Output Power Control

Product Details

The AD8327 is a low-cost, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 48.16 dB range resulting in gain changes of 6.02 dB/major carry.


  • Supports DOCSIS Standard for
    Reverse Path Transmission
  • Gain Programmable in 6.02 dB
    Steps over a 48.16 dB Range
  • Low Distortion at 60 dBmV Output
    –63 dBc SFDR at 21 MHz
    –57 dBc SFDR at 42 MHz
  • Output Noise Level
    –47 dBmV in 160 kHz
  • Maintains 75Ω Output Impedance
    Transmit Enable and Transmit
    Disable Modes
  • Upper Bandwidth:
    160 MHz (Full Gain Range)
  • 5 V Supply Operation
  • Supports SPI Interfaces

Functional Block Diagram for AD8327

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