VS1002d is a single-chip MP3 audio decoder. It contains a high-performance, low-power DSP processor core VS DSP4, working data memory, 5KiB instruction RAM and 2.5 KiB data RAM foruser applications, serial control and input data interfaces,4 general purpose I/O pins, an UART, aswell as a high-quality variable-sample-rate monoADC and stereo DAC, followed by an earphoneamplifier and a ground buffer.VS1002d receives its input bitstream through aserial input bus, which it listens to as a systemslave. The input stream is decoded and passedthrough a digital volume control to an 18-bit oversampling,multi-bit, sigma-delta DAC. The decodingis controlled via a serial control bus. In additionto the basic decoding, it is possible to addapplication specific features, like DSP effects, to the user RAM memory.
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