Triple Differential Driver With Sync-On-Common-Mode Data Sheet AD8134 FEATURES FUNCTIONAL BLOCK DIAGRAM Triple high speed differential driver 225 MHz, 3 dB large signal bandwidth 450 MHz, 3 dB small signal bandwidth 24 23 22 21 20 19 Easily drives 1.4 V p-p video signal into doubly terminated AD8134 OPD 1 18 SYNC LEVEL 100 UTP cable V 2 17 V (SYNC) 1600 V/s slew rate S S+ 2 3 16 Fixed internal gain of 2 IN R IN B Internal common-mode feedback network +IN R 4 15 +IN B G Output balance error 60 dB 50 MHz B V 5 R 14 V S S On-chip sync-on-common-mode circuitry OUT R 6 13 OUT B Output pull-down feature for line isolation 7 8 9 10 11 12 Differential input and output Differential-to-differential or single-ended-to-differential operation Figure 1. High isolation between amplifiers: 80 dB 10 MHz Low distortion: 64 dB SFDR 10 MHz on 5 V supply, 0 V = 2V p-p OUT, dm R = 200 L, dm 10 V /V OUT, cm OUT, dm Low offset: 3 mV typical output-referred on 5 V supply 20 Low power: 26.5 mA 5 V for three drivers and sync circuitry V = 5V S 30 Wide supply voltage range: +5 V to 5 V Available in space-saving packaging: 4 mm 4 mm LFCSP 40 50 APPLICATIONS V = +5V S 60 Keyboard-video-mouse (KVM) networking 70 GENERAL DESCRIPTION 80 The AD8134 is a major advancement beyond using discrete 90 op amps for driving differential RGB signals over twisted pair 100 cable. The AD8134 is a triple, low cost differential or single- 1 10 100 500 ended input to differential output driver, and each amplifier has FREQUENCY (MHz) a fixed gain of 2 to compensate for the attenuation of the line Figure 2. Output Balance vs. Frequency termination resistors. The AD8134 is specifically designed for The AD8134 driver is a natural complement to the AD8143, RGB signals but can be used for any type of analog signals or AD8129, and AD8130 differential receivers. high speed data transmission. The AD8134 is capable of driving Manufactured on the Analog Devices next generation XFCB either Category 5 (Cat-5) unshielded twisted pair (UTP) cable bipolar process, the AD8134 has a large signal bandwidth of or differential printed circuit board transmission lines with 225 MHz and a slew rate of 1600 V/s. The AD8134 has an minimal signal degradation. internal common-mode feedback feature that provides output A unique feature that allows the user to transmit balanced gain and phase matching that is balanced to 60 dB at 50 MHz, horizontal and vertical video sync signals over the three suppressing harmonics and reducing radiated EMI. common-mode channels with minimal electromagnetic The AD8134 is available in a 24-lead LFCSP and can operate interference (EMI) radiation is included on-chip. over the 40C to +85C extended industrial temperature range. The outputs of the AD8134 can be set to a low voltage state that allows easy differential multiplexing of multiple drivers on the same twisted pair cable, when used with external series diodes. 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 20042016 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com OUTPUT BALANCE ERROR (dB) +OUT R V S+ V IN G S+ +OUT G +IN G OUT G V (SYNC) S V V S+ SYNC +OUT B H SYNC 04770-001 04770-018AD8134 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Input Common-Mode Voltage Range in Single-Supply Applications ................................................................................ 14 Applications ....................................................................................... 1 Driving a Capacitive Load ......................................................... 14 General Description ......................................................................... 1 Output Pull-Down (OPD) ........................................................ 14 Functional Block Diagram .............................................................. 1 Sync-On-Common-Mode ......................................................... 15 Revision History ............................................................................... 2 Applications ..................................................................................... 16 Specifications ..................................................................................... 3 Driving RGB Video Over Cat-5 Cable .................................... 16 Absolute Maximum Ratings ............................................................ 5 How to Apply the Output Pull-Down Feature ....................... 17 Thermal Resistance ...................................................................... 5 KVM Networks ........................................................................... 17 ESD Caution .................................................................................. 5 Video Sync-On-Common-Mode ............................................. 17 Pin Configuration and Function Descriptions ............................. 6 Level-Shifting Sync Pulses on 5 V Supplies.......................... 18 Typical Performance Characteristics ............................................. 8 Layout and Power Supply Decoupling Considerations ......... 19 Theory of Operation ...................................................................... 13 Amplifier-to-Amplifier Isolation ............................................. 19 Definition of Terms .................................................................... 13 Exposed Paddle (EP).................................................................. 19 Analyzing an Application Circuit ............................................. 13 Outline Dimensions ....................................................................... 20 Closed-Loop Gain ...................................................................... 13 Ordering Guide .......................................................................... 20 Calculating an Application Circuits Input Impedance ......... 14 REVISION HISTORY 3/16Rev. A to Rev. B Changed CP-24 to CP-24-10 ............................................. Universal Changes to Figure 4 and Table 5 ..................................................... 6 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 10/05Rev. Sp0 to Rev. A Changes to Features and General Description ............................. 1 Changes to Figure 32 ...................................................................... 14 Changes to Figure 33 ...................................................................... 15 Changes to Figure 34 ...................................................................... 17 Added Level-Shifting Sync Pulses on 5 V Supplies Section ... 17 Changes to Ordering Guide .......................................................... 19 7/04Revision Sp0: Initial Version Rev. B Page 2 of 20