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Maxim filters, buffer suit 1080i, 720p, 480p, 480i standards

Posted: 05 Nov 2004 ?? ?Print Version ?Bookmark and Share

Maxim Integrated Products has developed 3-channel, switchable HD/SD video-reconstruction filters and buffers ideal for 1080i, 720p, 480p and 480i video scanning-system standards.

According to the company, each channel of the MAX7454 and MAX7455 combines a lowpass filter with a video buffer capable of driving a standard 150-ohm video load with a 2V peak-to-peak signal. The magnitude response of the lowpass filter can be switched between a 10MHz and 30MHz bandwidth through a control pin, which allows optimal filtering for HD, SDi or SDp encoder DAC outputs, Maxim added.

The input and output signals are DC-coupled to the devices, eliminating AC-coupling caps that consume board space and add cost. The new products are suitable for anti-aliasing or DAC-output video-reconstruction applications in digital video devices such as HD STBs, as well as HDTVs such as CRTs, LCDs, plasmas and DLPs.

The MAX7454 has an output buffer gain of 6dB, while the MAX7455 has an output buffer gain of 12dB. The 3-channel devices are ideal for RGB or Y Pr Pb component video signals in interlaced, progressive scan, or high-definition formats. In HD mode (fc = 30MHz), each filter channel achieves -55dB of attenuation at 74.25MHz, with -2.3dB of attenuation at 30MHz. In SD mode (fc = 10MHz), each filter channel achieves -62dB of attenuation at 27MHz, with -0.40dB of attenuation at 10MHz. A fine-adjustment control pin is available to optimize the corner

frequency of the filter response by 15 percent, the company said.

Saving board space and design time, the MAX7454 and MAX7455 are offered in a 20-TSSOP package and operate over the upper commercial temperature range. Prices start at $2.75 (1,000-up, FOB USA).

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