Datasheet Linear Technology LT1204

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Application Notes

• Download
  Video Circuit Collection &mdash AN57
  PDF, 559 Kb, File published: Jan 2, 1994
  AN57, the Video Circuit Collection, features a variety of video circuits designed at LTC. The LT1204 70MHz multiplexer is featured in a number of circuits which require excellent video isolation from channel to channel. High speed voltage and current feedback amplifiers are highlighted throughout the section on video processing circuits. There is a section on applying Current Feedback Amplifiers (CFAs) and a number of articles taken from the Linear Technology magazine.
  Extract from the document

  Application Note 57
  January 1994
  Video Circuit Collection
  Jon Munson and Frank Cox
  INTRODUCTION
  Even in a time of rapidly advancing digital image processing, analog video signal processing still remains eminently
  viable. The video A/D converters need a supply of properly
  amplified, limited, DC restored, clamped, clipped, contoured, multiplexed, faded and filtered analog video before
  they can accomplish anything. After the digital magic is
  performed, there is usually more amplifying and п¬Ѓltering
  to do as an adjunct to the D/A conversion process, not to mention all those pesky cables to drive. The analog way
  is often the most expedient and efficient, and you don’t
  have to write all that code.
  The foregoing is only partly in jest. The experienced engineer
  will use whatever method will properly get the job done;
  analog, digital or magic (more realistically, a combination
  of all three). Presented here is a collection of analog video
  circuits that have proven themselves useful. CIRCUIT INDEX
  I. Video Amplifier Selection Guide . 2 II. Video Cable Drivers . 3
  AC-Coupled Video Drivers . 3
  DC-Coupled Video Drivers . 4
  Clamped AC-Input Video Cable Driver . 5
  Twisted-Pair Video Driver and Receiver . 5 III. Video Processing Circuits . 6 …

Design Notes

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  Single 4-Input IC Gives Over 90dB Crosstalk Rejection at10MHz and is Expandable &mdash DN79
  PDF, 106 Kb, File published: Feb 1, 1994
  Extract from the document

  Single 4-Input IC Gives Over 90dB Crosstalk Rejection at
  10MHz and is Expandable – Design Note 79
  John Wright
  Introduction
  Professional video systems need to multiplex between
  many signals without interference from adjacent video
  sources that are not selected. Final system crosstalk
  rejection of all non-selected or “Hostile” signals of
  72dB is regarded as “professional quality.” This level
  of isolation is very difficult to achieve because every
  doubling in the number of inputs degrades the crosstalk
  by 6dB. In the past because no single IC was good
  enough, cascades of discrete switches and amplifiers
  were used to achieve the necessary isolation. An additional requirement of some video multiplexers is the
  ability to switch quickly and cleanly so the sources can
  be changed in picture without visible lines or distortion.
  New emerging multimedia systems require the performance of professional systems in the PC environment. 75MHz current feedback amplifier to drive 75Ω cables.
  Figure 1 shows the LT1204 in a typical application.
  Expanding the Number of Inputs
  To expand the number of MUX inputs LT1204s can
  be paralleled by shorting their outputs together. The
  Disable feature ensures that amplifier outputs that are
  not selected do not alter the cable termination. When …

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Manufacturer's Classification

• Signal Conditioning > Amplifiers > Operational Amplifiers (Op Amps) > High Speed Amplifiers (GBW > 50MHz) | High Voltage Amplifiers (>12V) | Current Feedback Amplifiers | Low Noise Amplifiers (
• Signal Conditioning > Amplifiers > Video Functions