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AD8128:  CAT-5 Receiver with Adjustable Line Equalization

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.

Low integrated output noise and offset voltage adjust make the AD8128 an excellent choice for dc-coupled wideband RGB-over-CAT-5 applications. For systems where the UTP cable is longer than 100 meters, two AD8128s can be cascaded to compensate for losses up to 200 meters of CAT-5/CAT-5e.

The AD8128 can be used as a stand-alone 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 is available in a 3 mm x 3 mm 8-lead LFCSP and is rated to operate over the extended temperature range of -40°C to + 85°C.


  • Tuned to compensate for Category-5 (CAT-5) cable losses
    Up to 100 meters @ 120 MHz
  • 2 voltage controlled frequency response adjustment pins
    High frequency peaking adjustment
    Broadband gain adjustment
  • Slew rate: 2700 V/µs
  • Low output noise
    1.5 mV rms integrated noise @ 100 meters equalized bandwidth
  • DC output offset adjust
  • Equalized pass-band ripple ±1 dB to 70 MHz
  • Supply current: 24 mA on ±5 V
  • Small 8-lead 3 mm x 3 mm LFCSP

Functional Block Diagram for AD8128


Title Content Type File Type
AD8128: CAT-5 Receiver with Adjustable Line Equalization Data Sheet (Rev 0, 10/2005) (pdf, 305 kB) Data Sheets PDF
Amplifiers for Video Distribution  (pdf, 115 kB) Product Selection Guide PDF
Video Amplifier Products (April 2007)  (pdf, 4117 kB) Overview PDF
RAQs index Rarely Asked Questions HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

AD8128 Model Options
Model Package Pins Temp.
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
AD8128ACPZ-R2 Status: Production 8 ld LFCSP (3x3mm) 8 Ind Reel, 250 $3.55 $3.55 Y  Material Info PCN Purchase
AD8128ACPZ-R7 Status: Production 8 ld LFCSP (3x3mm) 8 Ind Reel, 1500 - $2.62 Y  Material Info PCN Purchase Sample
AD8128ACPZ-RL Status: Production 8 ld LFCSP (3x3mm) 8 Ind Reel, 5000 - - 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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