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AD8122:  Triple Differential Receiver with 300m Adjustable Cable Equalization

Product Details

Product Status:Recommended for New Designs

The AD8122 is a triple, high speed, differential receiver and equalizer that compensates for the transmission losses of UTP and coaxial cables up to 300 meters in length. Various gain stages are summed together to best approximate the inverse frequency response of the cable. Each channel features a high impedance differential input that is ideal for interfacing directly with the cable.

The AD8122 has two control inputs for optimal cable compensation, one LPF control input, an input to select between UTP and coax cable, and an output offset adjust input. The cable compensation inputs are used to compensate for different cable lengths; the VPEAK input controls the amount of high frequency peaking and the VGAIN input adjusts the broadband flat gain, which compensates for the flat cable loss. The VFILTER input controls the cutoff frequency of output lowpass filters on each channel. Selection between UTP and coaxial cable compensation responses is determined by the binary COAX/UTPinput, which can be left floating in UTP applications. The VOFFSET pin allows the dc voltage at the output to be adjusted, which can be useful in dc-coupled systems.

For added flexibility, the gains of each channel can be set to x1 or x2 using the associated GAIN control pins.

The AD8122 is available in a 6 mm × 6 mm, 40-lead LFCSP and is rated to operate over the extended temperature range of −40°C to +85°C.

APPLICATIONS

  • Keyboard-video-mouse (KVM)
  • Digital signage
  • RGB video over UTP cables
  • Professional video projection and distribution
  • HD video
  • Security video

FEATURES and BENEFITS

  • Compensates cables to 300 meters for wideband video
    -- 60 MHz Equalized BW @ 300 meters of UTP Cable
    -- 120 MHz Equalized BW @ 150 meters of UTP Cable
  • Fast time domain performance
    -- 70 nsec settling time to 1% with 300 meters of UTP cable
    -- 7 ns rise/fall times with 2 V step @ 300 meters of UTP cable
  • 3 frequency response gain adjustment pins
    -- High frequency peaking adjustment (VPEAK)
    -- Output lowpass filter cutoff adjustment (VFILTER)
    -- Broadband flat gain adjustment (VGAIN)
  • Selectable for UTP or coax compensation
  • DC output offset adjust (VOFFSET)
  • Low output offset voltage:
    ±4 mV @ G = 1
  • Compensates both RGB and YPbPr
  • Two on-chip comparators with hysteresis
    -- Can be used for common-mode sync extraction
  • Available in 40-lead, 6 mm × 6 mm LFCSP

Functional Block Diagram for AD8122

Video: AD8122 - 300m Cable Equalizer & Complete System Solution CFTL

Complete Solutions for Video over UTP Signal Chain

Documentation

Title Content Type File Type
AD8122: Triple Differential Receiver with 300m Adjustable Line Equalization Datasheet (Rev 0, 08/2012) (pdf, 395 kB) Data Sheets PDF
AD8122: 300m Cable Equalizer & Complete System Solution CFTL
The AD8122 enables clearer UXGA video transmission on Cat-5 cables over long distances (300+ m) and reduces power consumption in your video distribution systems. We also developed a Circuits from the Lab note that describes various applications.
Videos HTML
Analog Devices Introduces Industry’s Fastest and Most Power Efficient 300 meter UTP Cable Equalizer for Analog Video Distribution (22 Aug 2012) Press Releases HTML
Glossary of EE Terms Glossary HTML

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Price, packaging, availability

AD8122 Model Options
Model Package Pins Temp.
Range
Packing,
Qty
Price*(100-499) Price*1000 pcs RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8122ACPZ Status: Production LFCSP:LEADFRM CHIP SCALE 40 Tray, 490 $11.98 $9.90 Y  Material Info PCN Purchase Sample
AD8122ACPZ-R7 Status: Production LFCSP:LEADFRM CHIP SCALE 40 Reel, 750 - $9.90 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.

AD8122 Evaluation Board
Model Description Price RoHS View PCN/ PDN Check Inventory/
Purchase/Sample
AD8122-EVALZ Status: Production Evaluation Board - Yes - Contact ADI

Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.

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