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CVBS/S-video filter suits DAC-reconstruction digital video apps

Posted: 18 Jun 2007     Print Version  Bookmark and Share

Keywords:DAC  video reconstruction filter  SoC  CVBS 

Maxim Integrated Products has introduced high-performance, three-channel video reconstruction filter and buffer for Y/C (S-video) and CVBS video signal applications.

Supporting all standard definition TV (SDTV) video formats, the MAX7453 enables designers to turn two SoC DAC outputs into three video outputs. To reconstruct the DAC output, each channel integrates a lowpass filter and video buffer capable of driving one or two standard 150Ω video loads with a 2Vp-p signal into either an AC- or DC-coupled load. The Y and C video inputs are summed by the CVBS summer to produce a composite video output. Optimised for NTSC and PAL SDTV video systems, the MAX7453 is suited for DAC-reconstruction digital video applications, such as STBs, personal video recorders, hard-disc recorders and DVD players.

Many STB and DVD applications require an ideal filter response to achieve high-quality video images and to filter out unwanted DAC artifacts. To meet these requirements, MAX7453 provides a maximally flat frequency response, a 42dB stopband attenuation at 27MHz and 6dB output buffers that can drive 150Ω loads on each channel. Moreover, the output buffers can drive either an AC or a DC load such that the blanking-level voltage after the backmatch resistor is less than 1V. This feature eliminates the need for costly, bulky output capacitors in designs that utilise DC-coupled outputs.

Available in a space-efficient 8-pin SO package, MAX7453 operates from a single 5V supply and is fully specified over the 0?C to 70?C commercial temperature range. Prices start at Rs.51.49 ($1.26) for 1,000-unit quantities.

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