CAT-5 Receiver with Adjustable Line Equalization

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Product Details

The AD8128 is a high speed, differential receiver/equalizer that compensates for the transmission losses of unshielded twisted pair (UTP) CAT-5 cables. Various frequency dependent gain stages are summed together to best approximate the inverse frequency response of CAT-5/CAT-5e cable. An equalized bandwidth of 120 MHz can be achieved for 100 meters of cable.

The AD8128 can be used as a standalone receiver/equalizer or in conjunction with the AD8143, triple differential receiver, to provide a complete low cost solution for receiving RGB over UTP cable in such applications as KVM.

The AD8128 has three control pins for optimal CAT-5/CAT-5e compensation. The equalized cable length is directly proportional to the voltage applied to the VPEAK pin, which controls the amount of high frequency peaking. VGAIN adjusts the broadband gain from 0 dB to 3 dB, compensating for the resistive cable loss. VOFFSET allows the output to be shifted by ±2.5 V, adding flexibility for dc-coupled systems.

Low integrated output noise and offset voltage adjust make the AD8128 an excellent choice for dc-coupled wideband RGB-overCAT-5 applications. For systems where the UTP cable is longer than 100 meters, two AD8128 devices can be cascaded to compensate for up to 200 meters of CAT-5/CAT-5e.

The AD8128 is available in a 3 mm × 3 mm 8-lead LFCSP and is rated to operate over the extended temperature range of −40°C to +85°C.


  • Keyboard-video-mouse (KVM)
  • RGB video over unshielded twisted pair (UTP) cable receivers
  • Professional video projection and distribution
  • Security video

Product Lifecycle

icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

AD8128 Material Declaration
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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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