The AD8123 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. Logic circuitry inside the AD8123 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 long cable equalization (up to 300 meters). Each channel features a high impedance differential input that is ideal for interfacing directly with the cable.

The AD8123 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 cable lengths; the V_PEAK pin controls the amount of high frequency peaking and the V_GAIN pin adjusts the broadband flat gain, which compensates for the low frequency flat cable loss.

For added flexibility, an optional pole adjustment pin, V_POLE, 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 V_OFFSET pin allows the dc voltage at the output to be adjusted, adding flexibility for dc-coupled systems.

The AD8123 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

Data Sheet, Rev. A, 11/07

Part#	-3 dB BW (MHz)	Slew Rate (V/us)	0.1 dB Flatness (MHz)	Minimum Gain (Acl)	Pos Supply	Supply Current (max)	Features	Package	Price* (1000-4999)
AD8123	120	-	-	-	+4.5V to +5.5V	132mA	Up to 300 m of Cat-5	40-Lead LFCSP	$7.79
AD8128	120	2700	70	-	+4.5V to +5.5V	24mA	Up to 100m of CAT-5	8-Lead LFCSP	$2.59

* The pricing listed here is provided only for budgetary purposes as recommended list price in U.S. Dollars in the United States ex factor per unit for the stated volume. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
** Pricing is currently unavailable. Click on the product number to see the Product Page for additional information.

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This is the acceptable operating range of the device. The various ranges specified are as follows:

• Commercial: 0 to +70 degrees Celsius
• Military : -55 to +125 degrees Celsius
• Industrial: Temperature ranges may vary by model. Please consult the datasheet for more information.
• Automotive: -40 to +125 degrees Celsius

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