Maxim’s new MAX7453 is a high performance, three-channel video reconstruction filter and buffer for Y/C (S-video) and CVBS (composite video broadcast signal) video signal applications. Claiming to support all SDTV (standard definition television) 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 low-pass 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. Optimised for NTSC and PAL SDTV video systems, the MAX7453 is ideal for DAC-reconstruction digital video applications, such as set-top boxes (STBs), personal video recorders (PVRs), hard-disk recorders (HDRs), 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 artefacts. To meet these requirements, the MAX7453 provides a maximally flat frequency response, a 42 dB stop-band attenuation at 27 MHz, and +6 dB output buffers that are capable of driving 150 Ω loads on each channel. Additionally, the output buffers can drive either an AC or a DC load such that the blanking-level voltage after the back-match resistor is less than 1 V. This feature eliminates the need for costly, bulky output capacitors in designs that utilise 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.
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