Low Cost, Triple Differential Drivers for Wideband Video Data Sheet AD8141/AD8142 FEATURES FUNCTIONAL BLOCK DIAGRAMS Triple, high speed differential drivers 255 MHz, 3 dB large signal bandwidth 65 MHz, 0.1 dB flatness 24 23 22 21 20 19 1150 V/s slew rate AD8141 12 ns settling time DIS 1 18 V C OCM Single 5 V or split supply operation V V /GND 2 17 S S+ Fixed gain of 2 IN A 3 16 IN C +IN A 4 15 +IN C Internal common-mode feedback network + V /GND V /GND 5 14 S S Output balance error 50 dB at 50 MHz 13 OUT C OUT A 6 AD8142 has integrated sync-on-common-mode circuitry High-Z output when disabled 7 8 9 10 11 12 Differential-to-differential or single-ended-to-differential operation High isolation between amplifiers: 100 dB at 10 MHz Figure 1. Low power: 44 mA at 5 V Available in space-saving packaging: 4 mm 4 mm LFCSP APPLICATIONS 24 23 22 21 20 19 Keyboard-video-mouse (KVM) networking AD8142 Video distribution DIS 1 18 SYNC LEVEL Digital signage V /GND 2 17 V S+ S Security cameras 2 IN R 3 16 IN B +IN R 4 15 +IN B + V /GND 5 14 V /GND S S OUT R 6 13 OUT B 7 8 9 10 11 12 Figure 2. GENERAL DESCRIPTION The AD8142 includes a unique sync-on-common-mode feature The AD8141 and AD8142 are triple, low cost, differential or that allows the user to transmit balanced horizontal and vertical single-ended-input-to-differential-output drivers. Each amplifier video sync signals over the three common-mode channels. has a fixed gain of 2 to compensate for the attenuation of the Additionally, the AD8141 and AD8142 both have a disable line termination resistors. The AD8141 and AD8142 are feature that, when asserted, produces high-Z outputs, allowing specifically designed for RGB signals but can be used for any line isolation and easy multiplexing. type of signals. The amplifiers have very fast slew rate and settling time while being manufactured on a cost effective The AD8141 and AD8142 are available in a 24-lead 4 mm 4 mm CMOS process. They are optimized for high resolution video LFCSP and operate over a temperature range of 40C to +85C. performance with a 0.1 dB flatness of 65 MHz, which allows They can be used with the AD8145 triple differential-to-single- driving high resolution video over any type of UTP cable. ended receiver, AD8123 triple equalizer, AD8120 triple delay line, and the AD8117 or AD8175 crosspoint switches to produce The drivers have an internal common-mode feedback loop a high resolution video distribution system. that provides output amplitude and phase matching, achieving 50 dB balance error at 50 MHz and thereby suppressing even- order harmonics and minimizing radiated electromagnetic interference (EMI). Rev. B 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 20112017 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. V +OUT R S+ V +OUT A S+ V IN G S+ V IN B S+ +IN G +OUT G +IN B +OUT B V /GND OUT G S V /GND OUT B S V V SYNC S+ V A V OCM S+ H SYNC +OUT B V B OCM +OUT C 09461-001 09461-002 + + + + AD8141/AD8142 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Input Common-Mode Voltage Range in Single-Supply Applications ................................................................................ 16 Applications ....................................................................................... 1 Terminating a Single-Ended Input........................................... 16 General Description ......................................................................... 1 Driving a Capacitive Load ......................................................... 17 Functional Block Diagrams ............................................................. 1 Disable ......................................................................................... 17 Revision History ............................................................................... 2 AD8142 Sync-On-Common-Mode ......................................... 17 Specifications ..................................................................................... 3 Applications Information .............................................................. 18 Absolute Maximum Ratings ............................................................ 5 Driving RGB Video Over Cat-5 Cable .................................... 18 Thermal Resistance ...................................................................... 5 Single 5 V Supply Application Information ............................ 19 Maximum Power Dissipation ..................................................... 5 AD8142 Signal Levels on Various Supplies ............................ 20 ESD Caution .................................................................................. 5 Disable Feature ........................................................................... 20 Pin Configurations and Function Descriptions ........................... 6 Driving Multiple Outputs.......................................................... 21 Typical Performance Characteristics ............................................. 8 Video Sync-On-Common-Mode (AD8142) ........................... 21 Basic Test Circuit ........................................................................ 13 Layout and Power Supply Decoupling Considerations ......... 22 Terminology .................................................................................... 14 Amplifier-to-Amplifier Isolation ............................................. 22 Theory of Operation ...................................................................... 15 Exposed Paddle (EPAD) ............................................................ 22 Analyzing an Application Circuit ............................................. 15 Typical AD8142 5 V Application Circuit ................................ 23 Closed-Loop Gain ...................................................................... 15 Outline Dimensions ....................................................................... 24 Calculating an Application Circuits Input Impedance ......... 15 Ordering Guide .......................................................................... 24 REVISION HISTORY 3/2017Rev. A to Rev. B Updated Outline Dimensions ....................................................... 24 Changes to Ordering Guide .......................................................... 24 4/2013Rev. 0 to Rev. A Changed Gain to Green Common-Mode Output Maximum Parameter from 1.2 V/V to 2.20 V/V Table 1............................... 3 7/2011Revision 0: Initial Version Rev. B Page 2 of 24