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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT1809CS6 датащи(PDF) 20 Page - Linear Technology |
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LT1809CS6 датащи(HTML) 20 Page - Linear Technology |
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20 / 24 page  20 LT1809/LT1810 TYPICAL APPLICATIO S Single Supply Video Line Driver The LT1809 is a wideband rail-to-rail op amp with a large output current that allows it to drive video signals in low supply applications. Figure 8 depicts a single supply video line driver with AC coupling to minimize the quiescent power dissipation. Resistors R1 and R2 are used to level- shift the input and output to provide the largest signal swing. A gain of 2 is set up with R3 and R4 to restore the signal at VOUT, which is attenuated by 6dB due to the matching of the 75 Ω line with the back-terminated resistor, R5. The back termination will eliminate any re- flection of the signal that comes from the load. The input termination resistor, RT, is optional—it is used only if matching of the incoming line is necessary. The values of C1, C2 and C3 are selected to minimize the droop of the luminance signal. In some less stringent requirements, the value of capacitors could be reduced. The – 3dB band- width of the driver is about 95MHz on 5V supply and the amount of peaking will vary upon the value of capacitor C4. – + LT1809 VIN 1809 F08 C1 33 µF C2 150 µF RT 75 Ω RLOAD 75 Ω VOUT R2 5k R3 1k R4 1k C4 3pF R1 5k 5V 2 3 6 7 4 R5 75 Ω 75 Ω COAX CABLE C3 1000 µF + FREQUENCY (MHz) –2 4 5 –3 –4 3 0 2 1 –1 0.2 10 100 1809 F09 –5 1 VS = 5V Figure 8. 5V Single Supply Video Line Driver Figure 9. Video Line Driver Frequency Response |
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