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AD8321:  Gain Programmable CATV Line Driver

Product Details

The AD8321 is a low cost digitally controlled variable gain amplifier optimized for coaxial line driving applications such as cable modems that are designed to the DOCSIS* (upstream) standard. An 8-bit serial word determines the desired output gain over a 53.4 dB range, resulting in gain changes of 0.75 dB/LSB.

The AD8321 is packaged in a low cost 20-lead SOIC, operates from a single +9 V supply, and has an operational temperature range of -40°C to +85°C.

An evaluation board is available for this product and may be ordered using the following product number: AD8321-EVAL. Schematic and layout for this evaluation board is contained in the product datasheet.


  • Linear in dB Gain Response Over >53 dB Range
  • Drives Low Distortion >11 dBm Signal into 75 Ω Load: –53 dBc SFDR at 42 MHz
  • Very Low Output Noise Level
  • Maintains Constant 75 Ω Output Impedance
    Power-Up and Power-Down Condition
    No Line Transformer Required
  • Upper Bandwidth:
    235 MHz (Min Gain)
  • 9 V Single Supply Operation
  • Power-Down Functionality
  • Supports SPI Interface
  • Low Cost

Functional Block Diagram for AD8321

Evaluation Kits & Symbols & Footprints

Symbols and Footprints— Analog Devices offers Symbols & Footprints which are compatible with a large set of today’s CAD systems for broader and easier support.

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