Integrated Active Filter Improves Video Quality

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.