• State Resolved
  • Locked Locked
  • Replies 3 replies
  • Subscribers 31 subscribers
  • Views 622 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

Sample synchronization of stereo dac

user2006423
Prodigy 20 points
Other Parts Discussed in Thread: PCM1793

Hi,

newbie question: Are the left an right channel of a stereo DAC always sample synchronized?

E.g. using a PCM1793 and delievering data over I2S, left and right channel date get one after another into the DAC.

Is the DAC waiting for the later channel and then converts both channels sychronized?

I think so, but couldn't find anything about it in the data sheets.

Greets,

Joerg

  • 0
    TI__Mastermind 28020 points
    Hi Joerg,

    Welcome to E2E! You are correct in that the DAC will wait until both channels are latched and then output them at the same time. This is how all of our audio DACs work.

    Justin
  • 0
    Expert 1720 points

    Hi Joerg,

    on the I2S bus are sent 32bit of data for LEFT channel, and next 32bit of data for RIGHT channel. Next are both channels LATCHED simultaneously to the analog output. There exist more data formats on the I2S bus. In past SONY used Right-justified format and PHILIPS I2S format (left-justified). I2S data format is in my opinion better, because it is much more universal. It accept 16 to 32 bit samples without any protocol change. Also you can use 16, 18, 20, 24 or 32bit DAC and everything works. Details of I2S protocol are in datasheet.