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AD8178 Datasheet(PDF) 1 Page - Analog Devices |
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AD8178 Datasheet(HTML) 1 Page - Analog Devices |
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1 / 40 page  450 MHz, Triple 16 × 5 Video Crosspoint Switch AD8178 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 © 2007 Analog Devices, Inc. All rights reserved. FEATURES Large, triple 16 × 5 high speed, nonblocking switch array Pin compatible with the AD8175 and AD8176 (16 × 9 switch arrays) and the AD8177 (16 × 5 switch array) Differential or single-ended operation Supports sync-on common-mode and sync-on color operating modes RGB and HV outputs available for driving monitor directly G = +4 operation (differential input to differential output) Flexible power supplies: +5 V or ±2.5 V Logic ground for convenient control interface Serial or parallel programming of switch array High impedance output disable allows connection of multiple devices with minimal loading on output bus Adjustable output CM and black level through external pins Excellent ac performance Bandwidth: 450 MHz Slew rate: 1650 V/μs Settling time: 4 ns to 1% to support 1600 × 1200 @ 85Hz Low power of 2.3 W Low all hostile crosstalk −82 dB @ 5 MHz −47 dB @ 500 MHz Wide input common-mode range of 4 V Reset pin allows disabling of all outputs Fully populated 26 × 26 ball PBGA package (27 mm × 27 mm, 1 mm ball pitch) Convenient grouping of RGB signals for easy routing APPLICATIONS RGB video switching KVM Professional video FUNCTIONAL BLOCK DIAGRAM 2 2 2 2 2 2 2 2 2 2 2 2 INPUT RECEIVER G = +2 OUTPUT BUFFER G = +1 5 80 25 VBLK VOCM_CMENCON VOCM_CMENCOFF R G B R G B CMENC SERIN RST UPDATE CLK WE SER/PAR D0 D1 D2 D3 D4 VPOS VNEG VDD DGND SEROUT H B G R V H B G R V 25 A0 A1 A2 AD8178 CS 1 0 SWITCH MATRIX G = +2 45-BIT SHIFT REGISTER WITH 5-BIT PARALLEL LOADING DECODE 5 × 5:16 DECODERS PARALLEL LATCH 20 NO CONNECT CLR Figure 1. GENERAL DESCRIPTION The AD8178 is a high speed, triple 16 × 5 video crosspoint switch matrix. It supports 1600 × 1200 RGB displays @ 85 Hz refresh rate, by offering a 450 MHz bandwidth and a slew rate of 1650 V/μs. With −82 dB of crosstalk and −90 dB isolation (@ 5 MHz), the AD8178 is useful in many high speed video applications. The AD8178 supports two modes of operation: differential-in to differential-out mode with sync-on CM signaling passed through the switch and differential-in to differential-out mode with CM signaling removed through the switch. The output CM and black level can be conveniently set via external pins. The outputs can be used single-ended in conjunction with decoded H and V outputs to drive a monitor directly. The independent output buffers of the AD8178 can be placed into a high impedance state to create larger arrays by paralleling crosspoint outputs. Inputs can be paralleled as well. The AD8178 offers both serial and a parallel programming modes. The AD8178 is packaged in a fully-populated 26 × 26 ball PBGA package and is available over the extended industrial temperature range of −40°C to +85°C. |
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