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Class-D amp tailored for DVD, Blu-ray players

Posted: 10 Jun 2010 ?? ?Print Version ?Bookmark and Share

Keywords:Class-D amplifier? power amplifier? Blu-ray?

TDA7498 Class-D amp

STMicroelectronics is rolling out an analog-input 2 x 100W class-D power amplifier, extending its range of Class-D devices that deliver audiophile sound quality in components smaller than competing devices by using an advanced chip manufacturing process.

With the market for Class-D amplifiers growing at around 50 percent per year, according to some industry estimates, ST's TDA7498 targets performance-featured equipment such as DVD and Blu-ray players, home theater, active speakers, and docking stations. In such applications, the Class-D amplifiers' high energy efficiency and low heat generation support super-slim product styling and also save costs by eliminating bulky heat sinks and high-wattage power supplies. Class-D products already make up the majority of audio products, where small size, low power consumption and high audio outputs are fundamental demands.

"ST's Class-D portfolio delivers performance, size and cost advantages, leveraging the technology lead we have established over our competitors," said Andrea Onetti, general manager, audio division, within ST's home entertainment and displays group. "The TDA7498 will enable our customers to create high-end multimedia products that look as good as they sound, which is increasingly important in today's consumer markets."

The TDA7498 is pin-compatible with the TDA7492 2 x 50W amplifier, announced in September 2009, as well as the 2x80W TDA7498L and 100W mono TDA7498MV also now entering production. Pin compatibility between devices supports scalable product design using a common hardware platform to optimize development costs and time-to-market for new models. To simplify development of multichannel applications, the TDA7498 can also be externally synchronized, thus saving external components and avoiding cross-channel interference between channels. In all, ST now has single-chip Class-D amplifier ICs from 2 x 3W to 2 x 100W.

ST's Class-D amplifier range is the first so far to use advanced BCD6S manufacturing technology, which allows analog, logic, and high-voltage functions to be built on a single chip. This simplifies design, increases reliability, reduces overall dimensions and saves BOM costs. Operating efficiency is also higher for a given chip size, compared to older processes, meaning that ST's Class-D ICs are typically smaller than competitors' devices. A further advantage is that BCD6S allows complementary n- and p-type transistors in the output circuitry, which saves the external bootstrap capacitor and diode normally required with processes that support n-type transistors only.

The TDA7498 features 10V to 39V supply voltage range and up to 90% operating efficiency. It also offers pop-free mute control and includes four selectable gain settings: 25.6dB, 31.6dB, 35.1dB, 37.6dB.

The TDA7498 is available immediately, packaged in a 10.3mm x 7.5mm PowerSSO36 package, priced from $4.5 for 1,000 pieces. Alternative pricing options are available for larger quantities.

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