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Micronas unveils reference design for 5.1 surround sound apps

Posted: 11 Oct 2004 ?? ?Print Version ?Bookmark and Share

Keywords:micronas? reference design? digital audio decoder? amplifier? audio processor map 460ya?

Based on its MAP 460yA and encompassing peripheral ICs, the new Arena reference design from Micronas is for a purely digital audio decoder and amplifier.

The new design is targeted at the market of cost-sensitive mid-range 5.1 surround sound applications. Paired with an additional DVD module, Arena can also serve the DVD-Home-Theatre-in-a-Box (HTiB) market, outperforming existing low-end designs feature- and connectivity-wise, the company said.

Arena is a complete, close to production reference design for a fully digital 5.1 audio decoder/amplifier with a USB interface for PC networking. The hardware, including power supply, can fit on a single PCB plus a front-PCB for display and push buttons. Class-D power stages ensure low power dissipation.

Stefan Hepp, Micronas' director for Marketing Consumer Audio, said, "Arena can be seen as a capability demonstrator of Micronas' comprehensive set of advanced audio ICs. The design in its entirety is very close to production which makes Arena also an ideal solution for own design manufacturers who want to bring their products to the market extremely fast."

Blends Hi-Res PWM technology, powerful audio processing

MAP 460yA, the heart of the design, features a Hi-Resolution PWM technology and powerful audio post processing capabilities. For 5.1 multichannel audio decoding and S/PDIF interfacing, a MAS 35xyH DSP is connected to the MAP 460yA. The USB codec UAC 3556B enables the PC networking capability, said to be a unique feature for this type of device.

Also integrated are an audio/video "lip sync" delay line and three dual channel Class-D amplifiers. The parameters and settings of the MAP 460yA are controlled via I?C bus by an SDA 555x microcontroller, which also controls the display, the push buttons and the IR input from the remote control. A 120W switched-mode power supply powers the design. Due to the MAP 460yA plus co-processor architecture, Arena can be employed in different feature sets and configurations, just by using different versions and combinations of ICs in its scalable design.

The reference design features USB PC networking, enabling digital audio playback. The PC acts as a jukebox, able to serve the audio system with the compressed audio files on its disk drives. Software drivers for Windows 98/2000/XP are already contained in each standard Windows installation. Two digital S/PDIF inputs, optical and coaxial, as well as four analog line inputs and one analog line output enable easy connection to other audio devices. In addition, up to six speakers, including the subwoofer, can be directly attached. An analog volume-controlled output for the connection of a powered subwoofer and an independent headphone output are also available.

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