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VS1003

MP3/WMA AUDIO CODEC

Unspecified 

VS1003

VS1003 - MP3/WMA AUDIO CODEC

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 driv-

ing a 30Ω 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 soft-

ware and 4 GPIO pins

Description

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

dio decoder and ADPCM encoder. It contains

a high-performance, proprietary low-power DSP

processor core VS_DSP4, working data mem-

ory, 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 variable-

sample-rate mono ADC and stereo DAC, fol-

lowed by an earphone amplifier and a com-

mon 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, sigma-

delta DAC. The decoding is controlled via a

serial control bus. In addition to the basic de-

coding, it is possible to add application spe-

cific features, like DSP effects, to the user

RAM memory.

mic

audio

line

audio

GPIO

VS1003

MIC AMP

MUX

4

GPIO

DREQ

SO

SI

SCLK

XCS

XDCS

Serial

Data/

Control

Interface

RX

TX

UART

Mono

ADC

Stereo

DAC

VSDSP4

Clock

multiplier

Instruction

RAM

Instruction

ROM

Stereo Ear−

phone Driver

X ROM

audio

L

R

output

X RAM

Y ROM

Y RAM

Version: 1.09, 2018-03-16

1

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