AD8128ACPZ-RL 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 V IN+ Broadband gain adjustment V OUT HPF V IN 2700 V/s slew rate Low output noise 1.5 mV rms integrated noise (1 GHz) at 100 meters LPF equalized bandwidth DC output offset adjust V V V PEAK GAIN OFFSET 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. V allows the output to be shifted by 2.5 V, adding OFFSET flexibility for dc-coupled systems. The AD8128 can be used as a standalone receiver/equalizer or 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 40C to +85C. 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20052016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 05699-001AD8128 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation .........................................................................9 Applications ....................................................................................... 1 Input Common-Mode Voltage Range Considerations ............9 Functional Block Diagram .............................................................. 1 Applications Information .............................................................. 10 General Description ......................................................................... 1 KVM Applications ..................................................................... 10 Revision History ............................................................................... 2 DC Control Pins ......................................................................... 10 Specifications ..................................................................................... 3 Cascaded Applications ............................................................... 11 Absolute Maximum Ratings ............................................................ 4 Exposed Pad (EP) ....................................................................... 11 Thermal Resistance ...................................................................... 4 Layout and Power Supply Decoupling Considerations ......... 11 ESD Caution .................................................................................. 4 Evaluation Boards ...................................................................... 11 Pin Configuration and Function Descriptions ............................. 5 Outline Dimensions ....................................................................... 12 Typical Performance Characteristics ............................................. 6 Ordering Guide .......................................................................... 12 Test Circuit .................................................................................... 8 REVISION HISTORY 6/2016Rev. 0 to Rev. A Changes to Figure 3 and Table 4 ..................................................... 5 Updated Outline Dimensions ....................................................... 12 Changes to Ordering Guide .......................................................... 12 10/2005Revision 0: Initial Version Rev. A | Page 2 of 12