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Design Notes

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  4 x 4 Video Crosspoint Has 100MHz Bandwidth and 85dB Rejection at 10MHz &mdash DN81
  PDF, 80 Kb, File published: Apr 1, 1994
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  4 Г— 4 Video Crosspoint Has 100MHz Bandwidth
  and 85dB Rejection at 10MHz – Design Note 81
  John Wright
  4 Г— 4 Crosspoint
  The compact high performance 4 Г— 4 crosspoint shown
  in Figure 1 uses four LTВ®1205s to route any input to
  any or all outputs. The complete crosspoint uses only
  six SO packages, and less than six square inches of
  PC board space. The LT1254 quad current feedback
  amplifier serves as a cable driver with a gain of 2. A
  В±5V supply is used to ensure that the maximum 150В°C
  junction temperature of the LT1254 is not exceeded in
  the SO package. With this supply voltage the crosspoint
  can operate at a 70В°C ambient temperature and drive
  2V (peak or DC) on to a double-terminated 75О© video
  cable. The feedback resistors of these output amplifiers have been optimized for this supply voltage. The
  –3dB bandwidth of the crosspoint is over 100MHz with
  only 0.8dB of peaking. All Hostile Crosstalk Rejection
  is 85dB at 10MHz when a shorted input is routed to all
  outputs. Keys to attaining this high rejection include:
  1. Mount the feedback resistors for the surface mount
  LT1254 on the backside of the PC board.
  2. Keep the (–) input traces of LT1254 as short as …

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Manufacturer's Classification

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

Other Names:

LT1259ISPBF, LT1259IS PBF