TSH345(2007) Ver la hoja de datos (PDF) - STMicroelectronics

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TSH345
(Rev.:2007)

Triple video buffer with selectable filter for HD and SD video applications

STMicroelectronics 

TSH345

Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components

4.1

Output capacitor

The output can be either DC-coupled or AC-coupled. The output can be connected to the

line via a 75-ohm resistor directly (see Figure 5). Or, an output capacitor can be used to

remove any DC components in the load. Assuming the load is 150-ohm, a coupling

capacitor of 220 µF can be used to provide a very low cut-off frequency close to 5 Hz (see

Figure 6).

Figure 5. DC output coupling (1 of 3 channels)

Video

DAC

+5V

150Ω

TSH345

75Ω 75Ω Cable

75Ω

Figure 6. AC output coupling (1 of 3 channels)

Video

DAC

150

+5V

75

TSH345

C=220µF

+

75 Cable

75

CS

1. CS is a 100nF used to decrease the parasitic components of C in high frequencies.

2. The 75-ohm resistor must be as close as possible to the output of the driver to minimize the effect of

parasitic capacitance.

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