AD8128: CAT-5 Receiver with Adjustable Line Equalization Data Sheet (Rev. A)10/1/2005373 K
Features and Benefits
- Tuned to compensate for Category-5 (CAT-5) cable losses
- Up to 100 meters at 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) at 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
- Small 8-lead 3 mm × 3 mm LFCSP
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 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.
- Keyboard-video-mouse (KVM)
- RGB video over unshielded twisted pair (UTP) cable receivers
- Professional video projection and distribution
- Security video
Product Lifecycle Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Documentation & Resources
Amplifiers for Video Distribution3/8/2008115 kB
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|Part Number||Material Declaration||Reliability Data||Pin/Package Drawing||CAD Symbols, Footprints & 3D Models|
|AD8128ACPZ-R2||Material Declaration||Reliability Data||8-Lead LFCSP (3mm x 3mm w/ EP)|
|AD8128ACPZ-R7||Material Declaration||Reliability Data||8-Lead LFCSP (3mm x 3mm w/ EP)|
|AD8128ACPZ-RL||Material Declaration||Reliability Data||8-Lead LFCSP (3mm x 3mm w/ EP)|
|Wafer Fabrication Data|
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