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Description

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. The IC can be used as a standalone 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 IC has three control pins for optimal CAT-5/CAT-5e compensation. The equalized cable length is directly proportional to the voltage applied to the VPEAK pin, which controls the amount of high frequency peaking. VGAIN adjusts the broadband gain from 0 dB to 3 dB, compensating for the resistive cable loss. VOFFSET allows the output to be shifted by ±2.5 V, adding flexibility for dc-coupled systems.

Features 

* 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
* 2700 V/μs slew rate
* Low output noise
* 1.5 mV rms integrated noise (1 GHz) @ 100 meters
* equalized bandwidth
* DC output offset adjust
* Low offset voltage error: 7 mV typ
* Equalized pass-band ripple ±1 dB to 70 MHz
* Input: differential or single ended
* Supply current: 24 mA on ±5 V

Applications : 

* Keyboard-video-mouse (KVM)
* RGB video over unshielded twisted pair (UTP) cable receivers
* Professional video projection and distribution
* Security video