ZXFV202N8EV

The wide bandwidth of the ZXFV202N8EV video amplifier 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.

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 ZXFV202N8EV 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 amplifier is configured for a voltage gain of 2, the overall gain is: 6 - 15.45 = -9.45dB.