GENERAL DESCRIPTION
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.
   
FEATURES
    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 75 Ω Output Impedance
        Transmit Enable and Transmit Disable Modes
    Upper Bandwidth: 160 MHz (Full Gain Range)
    5 V Supply Operation
    Supports SPI Interfaces
   
APPLICATIONS
    Gain-Programmable Line Driver
        DOCSIS High-Speed Data Modems
        Interactive Cable Set-Top Boxes
        PC Plug-in Cable Modems
    General-Purpose Digitally Controlled Variable Gain Block