Datasheet AD8128 (Analog Devices)

CAT-5 Receiver with Adjustable Line Equalization Data Sheet AD8128 FEATURES FUNCTIONAL BLOCK DIAGRAM Tuned to compensate for Category-5 (CAT-5) cable losses AD8128 Up to 100 meters at 120 MHz HPF 2 voltage controlled frequency response adjustment pins High frequency peaking adjustment Broadband gain adjustment VIN+ V 2700 V/μs slew rate OUT VIN– HPF Low output noise 1.5 mV rms integrated noise (1 GHz) at 100 meters LPF equalized bandwidth
01 0 9-
DC output offset adjust V V V
69
PEAK GAIN OFFSET
05
Low offset voltage error: 7 mV typ
Figure 1.
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 APPLICATIONS Keyboard-video-mouse (KVM) RGB video over unshielded twisted pair (UTP) cable receivers Professional video projection and distribution Security video GENERAL DESCRIPTION
The AD8128 is a high speed, differential receiver/equalizer that The AD8128 has three control pins for optimal CAT-5/CAT-5e compensates for the transmission losses of unshielded twisted pair compensation. The equalized cable length is directly proportional (UTP) CAT-5 cables. Various frequency dependent gain stages to the voltage applied to the VPEAK pin, which controls the amount are summed together to best approximate the inverse frequency of high frequency peaking. VGAIN adjusts the broadband gain response of CAT-5/CAT-5e cable. An equalized bandwidth of from 0 dB to 3 dB, compensating for the resistive cable loss. 120 MHz can be achieved for 100 meters of cable. VOFFSET allows the output to be shifted by ±2.5 V, adding The AD8128 can be used as a standalone receiver/equalizer or flexibility for dc-coupled systems. in conjunction with the AD8143, triple differential receiver, to Low integrated output noise and offset voltage adjust make the provide a complete low cost solution for receiving RGB over AD8128 an excellent choice for dc-coupled wideband RGB-over- UTP cable in such applications as KVM. CAT-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.
Rev. A Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2005–2016 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline FEATURES APPLICATIONS FUNCTIONAL BLOCK DIAGRAM GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Maximum Power Dissipation ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUIT THEORY OF OPERATION INPUT COMMON-MODE VOLTAGE RANGE CONSIDERATIONS APPLICATIONS INFORMATION KVM APPLICATIONS DC CONTROL PINS CASCADED APPLICATIONS EXPOSED PAD (EP) LAYOUT AND POWER SUPPLY DECOUPLING CONSIDERATIONS EVALUATION BOARDS OUTLINE DIMENSIONS ORDERING GUIDE