I2S DAC

Page last updated 10 Sep 2010, by   Simon Ford   No tags | 2 replies  

Whilst the mbed has a built-in ADC, it also includes an I2S digital audio interface which means we can connect up a high quality audio ADC.

Here are some basic requirements for trying to find a suitable one:

• Includes an amplifier of some sort (ideally headphone, with a bonus of small speaker/line)
• Is in a sensible SOIC/LQFP etc package, rather than BGA/CSP/QFN which is hard to hand solder
• Ideally could be run off the single 3.3v rail with minimal external components
• Is available widely in 1-off units

Options

Wolfson Microcelectronics

• WM8759 : Stereo DAC with headphone driver

TI TLV320DAC23

• http://focus.ti.com/docs/prod/folders/print/tlv320dac23.html

First experiments with the TI chip. It lives!

2 comments

Sridhar Anandakrishnan

# 21 Sep 2010

Excellent job.  Is the I2S driver a part of the library or did you write it as a "bit-banging" mode?
Thanks,

Sridhar

malcolm lear

# 02 Nov 2010

Hi Simon,

I guess BCLK from the TI chip connected to both I2SRX_CLK and I2STX_CLK and you used a 12MHz oscillator for the XTI/MCLK.

Is that correct?

 

Cheers

Malcolm

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