Maxim has developed 3-channel, switchable HD/SD video-reconstruction filters and buffers for 1080i, 720p, 480p, and 480i video scanning-system standards. Each channel of the MAX7454/MAX7455 combines a lowpass filter with a video buffer capable of driving a standard 150 Ω video load with a 2 V peak-to-peak signal.
The magnitude response of the lowpass filter can be switched between a 10 MHz and 30 MHz bandwidth through a control pin. The input and output signals are DC-coupled to the MAX7454/MAX7455, eliminating AC-coupling caps. These devices are ideal for anti-aliasing or DAC-output video-reconstruction applications in digital video devices such as HD STBss, as well as HDTVs as CRTs, LCDs, plasmas, and DLPs.
The MAX7454 has an output buffer gain of +6 dB and the MAX7455 has an output buffer gain of +12 dB. The 3-channel devices are ideal for RGB or Y Pr Pb component video signals in interlaced, progressive scan, or high-definition formats.
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