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ZXFV302EV Datasheet(PDF) 1 Page - Zetex Semiconductors |
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ZXFV302EV Datasheet(HTML) 1 Page - Zetex Semiconductors |
1 / 3 page SEMICO NDUC TORS Evaluation board description The wide bandwidth of the ZXFV302 4:1 channel video multiplexer necessitates some care in the layout of the printed circuit. For this reason Zetex has made available an Evaluation Board. The Evaluation Board layout serves as a useful example for many applications, showing a practical implementation of the advice given below. The ZXFV302EV can also be used to evaluate the ZXFV301 4:1 channel multiplexer. The ZXFV301 and ZXFV302 devices have very similar ac performance, with the only difference being in the active channel selection. Figures 1, 2 and 3 show the schematic and copper layout of a double-sided printed circuit board suitable for evaluation of the device in the laboratory. BNC connector sockets allow connection to test instruments via 50 cables. The output circuit includes a resistor matching circuit to present a load of 150 to the amplifier (equivalent to a 75 back-terminated video line) and simultaneously provide 50 output impedance. The attenuation of this matching circuit is 15.45 dB. As the multiplexer is internally configured for a voltage gain of 1, the overall gain from input to output is -15.45dB. ZXFV302EV ISSUE 1 - SEPTEMBER 2004 4:1 CHANNEL VIDEO MULTIPLEXER EVALUATION BOARD 1 Figure 1 Circuit schematic |
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