MAS3504D

The MAS 3504D can be applied in two major environments: as standalone decoder or as encoder/decoder combination. For decoding only mode, the DAC 3550A fits perfectly to the requirements of the MAS 3504D. It is a high-quality multi sample rate DAC (8 kHz.. 50 kHz) with internal crystal oscillator, which is only needed for generating the decoder Clock, and integrated stereo headphone amplifier plus two stereo inputs.

A delayed response of the host to the request signal (max. 20 milliseconds) will be tolerated by the MAS 3504D as long as the input buffer does not run empty. A PC might use its DMA capabilities to transfer the data in the background to the MAS 3504D without interfering with its foreground processes.

The source of the bit stream may be a memory (e.g. ROM, Flash) or PC peripherals, such as CD-ROM drive, a hard disk or a floppy disk drive.

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 sample. One second of compressed audio data uses 1000 bytes of memory.