VS1063a audio input to I2S

Designing hardware that uses VLSI Solution's devices as slave codecs such as an external MP3 decoder chip for a host microcontroller.
Post Reply
Posts: 1
Joined: Mon 2020-09-28 20:29

VS1063a audio input to I2S

Post by jmcexx » Mon 2020-09-28 23:21

Hi, my understanding is the I2S is an output from the VS1063a and is a copy of what is being sent to the DAC.

As part of a test mode, I would like to pass the raw data from the ADC to the I2S output. Is there a "bypass" type mode to pass the audio in to audio out? See attached path I'm asking about.
VS1063A_Audio_to_i2s.jpg (45.78 KiB) Viewed 122 times
Thank you,

User avatar
VLSI Staff
Posts: 2747
Joined: Tue 2010-06-22 13:43

Re: VS1063a audio input to I2S

Post by Panu » Fri 2020-10-02 7:15

The I2S output is a copy of the DAC output, when enabled. So any recording mode which has monitor output to headphones can be output to the I2S out.

But please note that the VS1053/VS1063 I2S output is 16-bit (16 bits per sample, 32 bits per frame), and only very few I2S DACs that really are strictly I2S compliant can understand the 16-bit data.

Almost all I2S dacs expect 24 bits per sample, 64 bits per frame and they usually will not output any audio from a 16-bit source.

Info: Line In and Line Out, VS1000 User interface, Overlay howto, Latest VSIDE, MCU Howto, Youtube
Panu-Kristian Poiksalo, VLSI Solution Oy

Post Reply