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Maxim offers "first" HD video filter amplifiers

Posted: 14 Dec 2005     Print Version  Bookmark and Share

Keywords:Maxim Integrated Products  MAX9500  MAX9501  video filter amplifier 

Maxim Integrated Products released what it claims as the world's first true high-definition (HD) video filter amplifiers. According to the company, the MAX9500 and MAX9501 are the only true HD filter amplifiers because they have greater than 40dB attenuation at 44.25MHz, which is a requirement for all HD signals sampled at 74.25MHz.

Designed for filtering and buffering HD video signals, both the MAX9500 and MAX9501 can be used as a reconstruction filter for HD video outputs of STBs, DVD-recorders, DVD players and satellite/cable receivers. The devices can also be used as an anti-aliasing filter for analogue inputs of HD televisions (HDTV).

Most MPEG decoders in STBs, DVD players and AV receivers reconstruct HD video at 74.25MHz. Because, however, HD video signals have a 30MHz bandwidth, there will be a significant alias beginning at 44.25MHz, said Maxim. Therefore, customers need a filter that will pass the baseband video up to 30MHz, but fully attenuate the alias beginning at 44.25MHz. Existing HD filters cannot deliver this needed 30MHz, but instead provide only 15dB attenuation at 44.25MHz, which allows the unwanted aliases to degrade the video quality.

Both the MAX9500 and MAX9501 provide a 30MHz passband and 50dB attenuation at 44.25MHz to completely suppress aliases for optimal video quality. The MAX9500 operates with a single 5V supply for customers that do not have negative a supply rail in their systems. These customers can choose to AC-couple or DC-couple the outputs with a positive DC bias for a very simple solution. Meanwhile, the MAX9501 operates with dual ±5V supplies.

The MAX9500 and MAX9501 come in compact 5-by-6mm, 16-pin QSOP and 16-pin SO packages. Pb-free packaging is also available. Prices start at Rs.48.14 ($1.05) FOB USA in quantities over 1,000 units.




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