MAS3504D datasheet(4/40 Pages) MICRONAS

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MAS 3504D

Micronas

G.729 Annex A Voice Codec

1. Introduction

The MAS 3504D is a single-chip codec for use in

memory-based voice recording and playback applica-

tions. Due to embedded memories, the embedded DC/

DC up-converter, and the very low power consump-

tion, the MAS 3504D is ideally suited for portable elec-

tronics.

The MAS 3504D implements a voice encoder and

decoder that is compliant to the ITU Standard G.729

Annex A. This standard works on 8 kHz, 16 bit, mono

audio data that is compressed to 1 bit per audio sam-

ple. One second of compressed audio data uses

1000 bytes of memory.

1.1. Features

– Single-chip G.729 decoder

– G.729 Annex A encoder

– ITU compliance tests passed

– Parallel input and parallel output of coded bitstream

data

– Input audio data read from an I2S bus (in various

formats)

– Output audio data delivered via an I2S bus (in vari-

ous formats)

– Digital volume / mute

– Low power dissipation (150 mW for encoder,

80 mW for decoder @ 3.3 V)

– Supply voltage range: 1.0 V to 3.6 V due to built-in

DC/DC converter (1-cell battery operation)

– Adjustable power supply supervision

– Power-off function

– Additional functionality achievable via download

software (ADPCM encoder/decoder)

Fig. 1–1: MAS 3504D block diagram

CLKI

decoded output

voice audio data

/3/

Serial In

I2C

RISC DSP Core

PIO

/3/

/8+5/

/2/

serial control

MAS 3504D

parallel I/O

DC/DC

Converter

Clock

Synthesizer

Serial Out

I2S

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