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GS4881 Datasheet(PDF) 11 Page - Gennum Corporation |
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GS4881 Datasheet(HTML) 11 Page - Gennum Corporation |
11 / 14 page 11 520 - 23 - 03 VIDEO 0.01µF CH1 CH2 2 75 Ω 4 8 680k 0.1µ 6 0.1µF CH1 VIDEO CH2 2 75 Ω 4 8 680k 0.1µ 6 APPLICATION NOTES (1) Choosing the Appropriate Input Coupling Capacitor to Optimize Slicing Level and Hum Rejection The video designer can adjust the slicing level by choosing the value of the input coupling capacitor. The relationship between slicing level and input coupling capacitor is described by the following equation. ∆V SLICE = ∆T = V DROOP where: I DIS = clamp discharge current = 11 µA ∆T = T LINE - TSYNC = (63.5 µs - 4.7 µs) C C = input coupling capacitor I DIS C C 137 127 117 107 97 87 77 0.01 0.02 0.03 0.04 0.05 0.06 0.07 0.08 0.09 0.10 INPUT COUPLING CAPACITOR ( µF) Fig. 21 Slicing Level vs Input Coupling Capacitor Figure 21 is a graphical representation of this equation and photographs 1 and 2 show the input video waveforms for 0.1 µF and 0.01 µF input capacitors respectively. The advantage in choosing a smaller input coupling capacitor, is increased hum rejection as the following analyses illustrates. Test Circuit 1 Test Circuit 2 Photograph 2 Photograph 1 CH1 CH2 CH1 CH2 |
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