Integrated Active Filter Improves Video Quality

Aug. 1, 2001

An integrated active filter designed to improve the quality of video images, the new ML6415 provides reconstruction filtering that removes the artifacts introduced by D/A conversion. Acting as a high-performance 7.1 MHz Y/C fourth-order Butterworth low-pass video filter, the device has outputs capable of driving 2 Vp-p ac-coupled 150_ loads. The filter also contains a summing circuit to generate filtered composite video, an audio trap, and group delay compensation circuits to notch-out audio for the addition of the FM audio carrier. Inputs are Y and C (S-video) and include sync tip clamps and anti-clipping circuits. The filtered outputs are ac-coupled Y, C and composite video (CV) with 42 dB stopband attenuation at 27 MHz and better than 1 dB flatness to 4.5 MHz on Y, C and CV. The filter offers a low cost monolithic alternative to discrete filtering solutions for digital set-top boxes, DVD players, PCI capture cards and other display applications. The 8-pin SOIC package costs $2.67 each/1,000. FAIRCHILD SEMICONDUCTOR INTERNATIONAL, San Jose, CA. (888) 522-5372.

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