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Single-conversion tuner targets hybrid apps

Posted: 24 Feb 2009     Print Version  Bookmark and Share

Keywords:silicon tuner  single down-conversion  artifact-free reception 


Aimed at hybrid (analogue and digital) applications, Maxim Integrated Products has introduced a single-conversion silicon tuner that employs a single down-conversion step from RF to 36MHz to deliver artifact-free reception of analogue signals and high-quality reception of digital signals.

Conventional products use either a dual-conversion architecture that requires two external filters or a direct-to-low-IF scheme that suffers from poor image rejection. The MAX3542 overcomes these impairments and offers a typical image rejection of 70dB while requiring a single external SAW filter. Applications include TVs, PCs and STBs.

The MAX3542 can replace canned tuners and has a standard 36MHz IF that is compatible with most digital and analogue demodulators. Additionally, the IC integrates tracking filters, a crystal oscillator circuit, a synthesiser and an IF VGA to save space and simplify design over canned-tuner implementations. It draws 230mA (typ) from a single 3.3V supply.

The MAX3542 is packaged in a 7mm x 7mm, 48-pin, Pb-free, flip-chip (fcLGA) package and is fully specified over the 0°C to +70°C temperature range.

Pricing starts at Rs.243.62 ($4.90) for 1,000-up quantities (FOB USA). Evaluation kits are available to speed designs.

- Ismini Scouras

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