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TA0310 bảng dữ liệu(PDF) 8 Page - STMicroelectronics |
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8 / 14 page 8/14 TA0310 Notes on video line driving Implementation of TSH11x family in single supply 0/+5V: Cin-R3 behaves like a high pass input filter (fc=16Hz) and removes the original DC component of the video signal to create a "floating" signal. The R1-R2 resistor divider provides the new DC component. The minimum level of that DC component must be ½VOL max (tested value). In order to limit the current through R1 and R2, the value of these resistances must be sufficiently high. The maximum values of R1 and R2 are calculated to in order to arrive at +Ibias max (see datasheet) equal to 1% of the current through R1 and R2. Cout removes the DC component to go back to the original video signal to fit with TV requirements. Figure 9: Implementation of the TSH11x in single supply 0/+5V video line 75 Ω 75 Ω 680 Ω + - +5V TSH11x 0V Cin(10µ) +5V + 1µ 10n Addition of a new DC component Cout (220µ) R3 1k 1Vpp 0Volt R1 R2 Twice the DC component (2Vdc) 0Volt 5Volt Rail of TSH11x : +1.2V max (tested) 680 Ω 2 R 1 R 2 R Vcc Vdc + × = 1Vpp 0Volt Removes the original DC component Removes the DC component Fc<5Hz 5V 0V 1Vp-p Signal on the line 300mV |
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