AD8128

CAT - 5接收机具有可调线路均衡 CAT-5 Receiver with Adjustable Line Equalization

Product Details

The 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 AD8128 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 AD8128 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.

Low integrated output noise and offset voltage adjust make the AD8128 an excellent choice for dc-coupled wideband RGB-overCAT-5 applications. For systems where the UTP cable is longer than 100 meters, two AD8128 devices can be cascaded to compensate for up to 200 meters of CAT-5/CAT-5e.

The AD8128 is available in a 3 mm × 3 mm 8-lead LFCSP and is rated to operate over the extended temperature range of −40°C to +85°C.

Applications

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Keyboard-video-mouse KVM

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RGB video over unshielded twisted pair UTP cable receivers

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Professional video projection and distribution

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Security video

### Features and Benefits

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Tuned to compensate for Category-5 CAT-5 cable losses

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Up to 100 meters at 120 MHz

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2 voltage controlled frequency response adjustment pins

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High frequency peaking adjustment

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Broadband gain adjustment

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2700 V/μs slew rate

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Low output noise

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1.5 mV rms integrated noise 1 GHz at 100 meters equalized bandwidth

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DC output offset adjust

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Low offset voltage error: 7 mV typ

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Equalized pass-band ripple ±1 dB to 70 MHz

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Input: differential or single ended

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Supply current: 24 mA on ±5 V

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Small 8-lead 3 mm × 3 mm LFCSP