Fairchild Semiconductor International introduces the ML6416 integrated active video filter with features optimized for the performance requirements of the DirecTV Network. The ML6416 offers a low cost monolithic alternative to discrete solutions. The ML6416 provides reconstructive filtering and Chroma/Luma delay compensation to improve the quality of television pictures. The device removes the artifacts introduced by D/A conversion and adds Chroma/Luma delay compensation to mimic the distortion introduced at the transmitter. In addition, the ML6416 contains an audio trap to notch out video.

The ML6416 is a high performance 7.1 MHz Y/C fourth order Butterworth low pass filter with outputs capable of driving 2 V p-p AC coupled 150 ohm loads. The filter contains a summing circuit to generate filtered composite video and an audio trap to notch out video for the addition of the FM audio carrier. The Chroma/Luma delay compensation advances the chroma by 170ns typically between 400 kHz and 3.58 MHz.

The ML6416 includes AC coupled inputs and a DC restoration circuit for low tilt. The inputs are Y, 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. Performance parameters are rated at 0.4% differential gain and 0.4° differential phase on the Y, C and CV channels and 0.8% total harmonic distortion on all channels.

Fairchild Semiconductor Customer Support Group at Fairchild Semiconductor International Analog and Mixed Signal Products Group, 3001 Orchard Parkway • San Jose, CA 95134. Tel: 888-522-5372; Fax: 972-910-8036.

This product is a dual monolithic continuous time video filter designed for reconstructing the luminance and chrominance signals from an S-Video D/A source. It's a welcome step forward from video filters previously reviewed on this site.

Composite video output is generated by summing the Y and C outputs. The chip is intended for use in applications with AC coupled input and AC coupled outputs.

In a typical application, the Y and C input signals from DACs are AC coupled into the filter. Both channels have DC restore circuitry to clamp the DC input levels during video sync. The Y and C channels use a separate feedback clamp. The clamp pulse is derived from the Y channel.

The filters are AC-coupled in and out with the input using a sync-tip clamp needing an external CMOS compatible H-sync. Fairchild Semi has learned from others and provided for the use of tri-level syncs, so you will not have to devise external processing to convert tri-level to a suitable unidirectional H-pulse for the filters.

The RF modulator output is capable of driving a 600-ohm load to 2 V p-p, but it is primarily intended to drive a modulator load. Applications include Cable Set-top Boxes Satellite Set-top Boxes DVD Players.

The ML6416 is offered in an 8-pin SOIC package. The chip is available for US$2.94 in lots of 1,000, is available now with a delivery of 12 to 16 weeks.

Data sheet: www.fairchildsemi.com/pf/ML/ML6416.html.