GENERAL DESCRIPTION
The AD8326 is a high-output power, digitally controlled, variable gain amplifier optimized for coaxial line driving applications such as data and telephony cable modems that are designed to the MCNS-DOCSIS upstream standard. An 8-bit serial word determines the desired output gain over a 53.5 dB range resulting in gain changes of 0.75 dB/LSB. The AD8326 is offered in two models, each optimized to support the desired output power and resulting performance.

FEATURES
   Supports DOCSIS Standard for Reverse Path
      Transmission
   Gain Programmable in 0.75 dB Steps over a 53.5 dB Range
   Low Distortion at 65 dBmV Output
      –62 dBc SFDR at 21 MHz
      –58 dBc SFDR at 65 MHz
   1 dB Compression of 25 dBm at 10 MHz
   Output Noise Level
      –45 dBmV in 160 kHz
   Maintains 75 Ω Output Impedance
      Power-Up and Power-Down Condition
   Upper Bandwidth: 100 MHz (Full Gain Range)
   Single or Dual Supply Operation

APPLICATIONS
   Gain-Programmable Line Driver
   CATV Telephony Modems
   CATV Terminal Devices
   General-Purpose Digitally Controlled Variable Gain Block