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AD8122

PRODUCTION

Triple Differential Receiver with 300m Adjustable Cable Equalization

Data Sheet (Rev. 0) Product Selection Table

Part Models: 2
1ku List Price: Starting From $11.65

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Overview

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
Selectable for UTP or coax compensation

3 frequency response gain adjustment pins
High frequency peaking adjustment (V_PEAK)
Output lowpass filter cutoff adjustment (V_FILTER)
Broadband flat gain adjustment (V_GAIN)
DC output offset adjust (V_OFFSET)
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

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 V_PEAK input controls the amount of high frequency peaking and the V_GAIN input adjusts the broadband flat gain, which compensates for the flat cable loss. The V_FILTER 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/UTP input, which can be left floating in UTP applications. The V_OFFSET 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

Part Models: 2
1ku List Price: Starting From $11.65

Documentation

Data Sheet 1

AD8122: Triple Differential Receiver with 300m Adjustable Line Equalization Datasheet (Rev.0) 05/21/2012

Application Note 1

AN-2543: Complete Broadband Video-over-UTP Driver and Receiver Solution for RGB, YPbPr, and More 08/16/2024

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. View our quality and reliability program and certifications for more information.

Part Model	Pin/Package Drawing	Documentation	CAD Symbols, Footprints, and 3D Models
AD8122ACPZ	40-Lead LFCSP (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
AD8122ACPZ-R7	40-Lead LFCSP (6mm x 6mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 6, 2014 - 13_0232 Assembly and Test Transfer of Select 6x6 and 7x7mm LFCSP Products to STATS ChipPAC China
		PCN13_0232_Form Material_Report Detailed Change Description Qualification Results Summary Test Correlation Report
AD8122ACPZ	PRODUCTION
AD8122ACPZ-R7	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Evaluation Kits

AD8122 Evaluation Board

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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
Selectable for UTP or coax compensation 3 frequency response gain adjustment pins
Compensates both RGB and YPbPr

High frequency peaking adjustment (VPEAK) Output lowpass filter cutoff adjustment (VFILTER) >Broadband flat gain adjustment (VGAIN)
DC output offset adjust (VOFFSET) Low output offset voltage: ±4 mV @ G = 1
Two on-chip comparators with hysteresis
Can be used for common-mode sync extraction
Available in 40-lead, 6 mm × 6 mm LFCSP

Product Details

The AD8122 is a high-speed, triple differential receiver and equalizer designed to compensate for signal loss in UTP cables (up to 300m) and coaxial cables (up to 200m) by adjusting gain stages to counteract cable frequency response. It features high impedance differential inputs with excellent common-mode rejection for direct cable interfacing, and provides control inputs for cable compensation, filter adjustment, cable type selection, and DC output offset. The device also offers selectable gain (1 or 2) and is available in a 40-lead LFCSP, operating in a temperature range of −40°C to +85°C.

Resources

EVAL-AD8122 User Guide
3/17/2025

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