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AD8325:  5 V CATV Line Driver Fine Step Output Power Control

Product Details

The AD8325 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 59.45 dB range resulting in gain changes of 0.7526 dB/LSB.

The AD8325 is packaged in a low-cost 28-lead TSSOP, operates from a single 5 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 AD8325-EVAL.


  • Supports DOCSIS Standard for Reverse Path Transmission
  • Gain Programmable in 0.75 dB Steps Over a 59.45 dB Range
  • Low Distortion at 61 dBmV Output
    –57 dBc SFDR at 21 MHz
    –55 dBc SFDR at 42 MHz
  • Output Noise Level: –48 dBmV in 160 kHz
  • Maintains 75Ω Output Impedance
    Transmit Enable and Transmit Disable Modes
  • Upper Bandwidth:100 MHz (Full Gain Range)
  • 5 V Supply Operation
  • Supports SPI Interfaces

Functional Block Diagram for AD8325

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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Price, packaging, availability

AD8325 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8325ARUZ Status: Production 28 ld TSSOP 28 Ind Tube, 50 $3.85 $3.34 Y  Material Info PCN Purchase
AD8325ARUZ-REEL Status: Production 28 ld TSSOP 28 Ind Reel, 2500 - $3.34 Y  Material Info PCN Purchase
Price Table Help

The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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