Triple Differential Receiver with

200 Meter Adjustable Cable Equalization

Data Sheet

AD8124

Rev. A

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FEATURES

Compensates cables to 200 meters for wideband video

All resolutions through UXGA

Fast rise and fall times

8 ns with 2 V step at 200 meters of UTP cable

37 dB peak gain at 100 MHz

Two frequency response gain adjustment pins

Compensates for variations between cables

Can be optimized for either UTP or coaxial cable

Low output offset voltage: 24 mV

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

APPLICATIONS

Keyboard-video-mouse (KVM)

Digital signage

RGB video over UTP cables

Professional video projection and distribution

HD video

Security video

FUNCTIONAL BLOCK DIAGRAM

AD8124

Figure 1.

GENERAL DESCRIPTION

The AD8124 is a triple, high speed, differential receiver and

equalizer that compensates for the transmission losses of UTP

and coaxial cables up to 200 meters in length. Various gain stages

are summed together to best approximate the inverse frequency

response of the cable. Logic circuitry inside the AD8124 controls

the gain functions of the individual stages so that the lowest

noise can be achieved at short-to-medium cable lengths. This

technique optimizes its performance for low noise, short-to-

medium range applications, while at the same time provides

the high gain bandwidth required for longer cable equalization

(up to 200 meters). Each channel features a high impedance

differential input that is ideal for interfacing directly with the cable.

The AD8124 has three control pins for optimal cable

compensation, as well as an output offset adjust pin. Two

voltage-controlled pins are used to compensate for different

compensates for the low frequency flat cable loss.

allows movement of the pole locations, allowing for the

compensation of different gauges and types of cable as well

as variations between different cables and/or equalizers. The

adding flexibility for dc-coupled systems.

The AD8124 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.