CVBS/S-video reconstruction filter/buffer supports SDTV video formats

Sunnyvale, Calif. — Maxim Integrated Products introduced the MAX7453 high-performance, three-channel video reconstruction filter and buffer for Y/C (S-video) and CVBS video signal applications. Supporting all SDTV video formats, this device enables designers to turn two system-on-a-chip 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 150 Ω video loads with a 2 Vp-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. Used for NTSC and PAL SDTV video systems, the MAX7453 is suitable for DAC-reconstruction digital video applications, including set-top boxes (STBs), personal video recorders (PVRs), hard-disk recorders (HDRs) and DVD players.

Many STB and DVD applications require a filter response to achieve high-quality video images and to filter out unwanted DAC artifacts. To meet these requirements, the MAX7453 provides a maximally flat frequency response, a 42-dB stopband attenuation at 27 MHz, and +6 dB output buffers which are capable of driving 150 Ω loads on each channel. Additionally, the output buffers can drive either an AC or a DC load so the blanking-level voltage after the backmatch resistor is less than 1 V. This feature eliminates the need for bulky output capacitors in designs which use DC-coupled outputs. Available in an 8-pin SO package, the MAX7453 operates from a single 5 V supply and is fully specified over the 0°C to 70°C commercial temperature range.

Availability: Now
Pricing: Begins at $1.26 each in 1,000-piece quantities
Data Sheet: MAX7453 filter/buffer

Maxim Integrated Products 408-737-7600,

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