LD6143 Просмотр технического описания (PDF) - Unspecified
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LD6143 Datasheet PDF : 9 Pages
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LD6143
Three Channel 4th Order Video Filter Driver
The same method can be used for biased signals with the addition of a pull-up resistor to make
sure the clamp never operates. The internal pull-down resistance is 800kΩ±20% so the external
resistance should be 7.5MΩ to set the DC level to 500mV, as follows Figure 6.
Figure 6. Biased SCART with DC-coupled output
The same circuits can be used with AC-coupled outputs if desired. As follows Figure 7, Figure 8
and Figure 9.
Figure 7. DC-coupled inputs, AC-coupled output
Figure 8. AC-coupled input and output
Figure 9. Biased SCART with AC-coupled output
NOTE: The video tilt or line time distortion will be dominated by the AC-coupling capacitor. The
value may need to be increased beyond 220µF in order to obtain satisfactory operation in some
applications.
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