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TSH345ID Datasheet(PDF) 9 Page - STMicroelectronics |
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TSH345ID Datasheet(HTML) 9 Page - STMicroelectronics |
9 / 14 page TSH345 Using the TSH345 to drive Y-C, CVBS, Y-U-V, Y-Pb-Pr and R-G-B video components 9/14 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) Figure 6. AC output coupling (1 of 3 channels) 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. 75 Ω 75 Ω Cable 75 Ω Video DAC 150 Ω +5V TSH345 C=220µF + 75 Cable 75 Video DAC 150 75 C S +5V TSH345 |
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