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DIX9211: Correct set-up and un-used pins?

Graham North1
Intellectual 415 points

Part Number: DIX9211
Other Parts Discussed in Thread: PCM9211

Hi,

All I need to do with the DIX9211 is covert an I2S signal into an SPDIF. It's massivly overkill, but I can't find anyting else that will do it. Am I looking at using the correct part?

Should I be using RXIN 0 or RXIN 2 for the input? I'm not totally sure of the hardware differences between RXIN 0 & 1 and RXIN 3-7?

Does it matter which output I use? MPO 0 or MPO 1?

I already have a 24.576 MCLK clock on the board, can I use that to drive XTI?

Will INT0 & INT1 diectly drive LEDs? All the examples I've seen buffers are used.

I'll interface to it via I2C, so I know what to do with those pins.

I don't need any clock outputs, what should I do with SCKC, BCK, LRCK, DOUT?

What should I do with all other un-used pins?

 

I've read on the forum to look at the ADC9211 as the part is the same (minus the ADC) and the datasheet has been updated more recently.
I've found an error in that:
In the layout example, the filter network capacitors are connected to 3V3, not GND.

Screenshot 2026-03-06 at 13.05.56.png

Regards,

G

 

 

 

 

  • 0
    TI__Mastermind 33601 points

    Hi, PCM9211/DIX9211 are your best choice, if no need for analog input processing then DIX9211. I answered your questions in blue.

    Should I be using RXIN 0 or RXIN 2 for the input? I'm not totally sure of the hardware differences between RXIN 0 & 1 and RXIN 3-7?

    Two of the 12 S/PDIF inputs integrate coaxial amplifiers; the other inputs are designed to be directly connected to CMOS sources (up to 5 V), or standard S/PDIF optical modules.

    Does it matter which output I use? MPO 0 or MPO 1?  No

    I already have a 24.576 MCLK clock on the board, can I use that to drive XTI? Yes, should be okay

    Will INT0 & INT1 diectly drive LEDs? All the examples I've seen buffers are used. I would use a driver 

    I'll interface to it via I2C, so I know what to do with those pins.

    I don't need any clock outputs, what should I do with SCKC, BCK, LRCK, DOUT? leave them float

    What should I do with all other un-used pins? Usually digital unused pins should be pulled to a known state (H or L)  and the digital outputs can be left alone.

    • The decoupling caps on supplies (  10uF + 0.1uF)  are always connected b/w  the supply and GND, so that is a typo in the layout diagram as you have noticed yourself.

    Regards,

    Arash

  • 0 in reply to Arash Loloee
    Intellectual 415 points

    Hi,

    "Usually digital unused pins should be pulled to a known state (H or L)"

    Is this tied directly or through a resistor?
    I'm trying to have as simple design (minimum parts) as possible.

    Please could you review my schematic and let me know if it looks ok? Again, I'd like the minimum number of parts ideally.

    I can not upload my screen capture, how can I send it to you?

    Thanks,

    G

  • 0 in reply to Graham North1
    TI__Mastermind 33601 points

    The pu/pd are usually through resistors.

    I will send you my contact via E2E and you can email it to me.

    For your future post, please note that you don't  click on "Reject the answer" if you have more questions, you simply ask them and we continue, 

    Please close this post and we continue off line . I can not send you message, please go ahead and send me one and I will reply

    Thanks,

    Arash