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.

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)