MAS3519F datasheet(5/92 Pages) MICRONAS

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DATA SHEET

MAS 35x9F

Micronas

June 30, 2004; 6251-505-1DS

MPEG Layer 2/3, AAC Audio Decoder,

G.729 Annex A Codec

Release Note: Revision bars indicate significant

changes to the previous edition. This data sheet

applies to the MAS 35x9F version B4.

1. Introduction

The MAS 35x9F is a single-chip, low-power MPEG

layer 2/3 and MPEG2-AAC audio stereo decoder. It

also contains the G.729 Annex A speech compression

and decompression technology for use in memory-

based or broadcast applications. Additional functional-

ity is achievable via download software (e.g., CELP

voice decoder, Micronas SC4 (ADPCM) encoder/

decoder).

The MAS 35x9F decoding block accepts compressed

digital data streams as serial bit streams or in parallel

format, and provides serial PCM and S/PDIF output of

decompressed audio. In addition to the signal process-

ing function, the IC incorporates a high-performance

stereo D/A converter, headphone amplifiers, a stereo

A/D converter, a microphone amplifier, and two DC/DC

converters.

Thus, the MAS 35x9F provides a true

“all-in-one”

solution that is ideally suited for highly optimized mem-

ory-based portable music players with integrated

speech recording and playback function.

In MPEG 1 (ISO 11172-3), three hierarchical layers of

compression have been standardized. The most

sophisticated and complex, layer 3, allows compres-

sion rates of approximately 12:1 for mono and stereo

signals while still maintaining CD audio quality. Layer 2

(widely used, e.g., in DVD) achieves a compression of

8:1 without significant losses in audio quality.

The MAS 35x9F supports the “Advanced Audio Cod-

ing” (AAC) that is defined as a part of MPEG 2. AAC

provides compression rates up to 16:1. It defines sev-

eral profiles for different applications. This IC decodes

the “low complexity profile” that is especially optimized

for portable applications.

The MAS 35x9F also implements a voice encoder and

decoder that is compliant to the ITU Standard G.729

Annex A.

SC4 is a proprietary Micronas speech codec technol-

ogy that can be downloaded to the MAS 35x9F, to

allow recording and playing back speech at various

sampling rates.

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