7.3.5 Video

The OPAx354-Q1 output stage is capable of driving standard back-terminated 75-Ω video cables (see Figure 32). A back-terminated transmission line does not exhibit a capacitive load to the driver. A properly back-terminated 75-Ω cable does not appear as capacitance; the cable presents a 150-Ω resistive load to the OPAx354-Q1 output.

Figure 32. Single-Supply Video Line Driver

This series of amplifiers can be used as an amplifier for RGB graphic signals, which have a voltage of zero at the video black level by offsetting and AC-coupling the signal (see Figure 33).

1. Source video signal offset 300 mV above ground to accommodate op amp swing to ground capability.

Figure 33. RGB Cable Driver