The MAS 3504D is a single-chip codec for use in memory-based voice recording and playback applications. Due to embedded memories, the embedded DC/DC up-converter, and the very low power consumption, the MAS 3504D is ideally suited for portable electronics.

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.

特性 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 various 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)