Features

 Decodes MPEG 1 & 2 audio layer III

(CBR +VBR +ABR); WMA 4.0/4.1/7/8/9

all profiles (5-384kbit/s); WAV (PCM +

IMA ADPCM); General MIDI / SP-MIDI

files

 Encodes IMA ADPCM from microphone

or line input

 Streaming support for MP3 and WAV

 Bass and treble controls

 Operates with a single 12..13 MHz clock

 Internal PLL clock multiplier

 Low-power operation

 High-quality on-chip stereo DAC with no

phase error between channels

 Stereo earphone driver capable of driving

a 30

load

 Separate operating voltages for analog,

digital and I/O

 5.5 KiB On-chip RAM for user code /

data

 Serial control and data interfaces

 Can be used as a slave co-processor

 SPI flash boot for special applications

 UART for debugging purposes

 New functions may be added with software

and 4 GPIO pins

Description

VS1003 is a single-chip MP3/WMA/MIDI audio

decoder and ADPCM encoder. It contains

a high-performance, proprietary low-power DSP

processor core VS_DSP4, working data memory,

5 KiB instruction RAM and 0.5 KiB data

RAM for user applications, serial control and

input data interfaces, 4 general purpose I/O

pins, an UART, as well as a high-quality variablesample-

rate mono ADC and stereo DAC, followed

by an earphone amplifier and a common

buffer.

VS1003 receives its input bitstream through

a serial input bus, which it listens to as a

system slave. The input stream is decoded

and passed through a digital volume control

to an 18-bit oversampling, multi-bit, sigmadelta

DAC. The decoding is controlled via a

serial control bus. In addition to the basic decoding,

it is possible to add application specific

features, like DSP effects, to the user

RAM memory.