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Single-conversion tuner sharpens analog, digital TV broadcast reception

Sunnyvale, Calif.—Aimed at hybrid (analog and digital) applications, Maxim Integrated Products has developed a single-conversion silicon tuner that employs a single downconversion step from RF to 36MHz to provide artifact-free reception of analog 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 set-top boxes.

The MAX3542 can replace canned tuners, and has a standard 36MHz IF that is compatible with most digital and analog demodulators. Additionally, the IC integrates tracking filters, a crystal oscillator circuit, a synthesizer, 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, lead-free, flip-chip (fcLGA) package, and is fully specified over the 0°C to +70°C temperature range.

Pricing: Starts at $4.90 (1000-up, FOB USA).
Availability: Evaluation kits are available to speed designs.
Datasheet: Click here.

Maxim Integrated Products, www.maxim-ic.com

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