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TLV320AIC3204: Single-point grounding of AGND and DGND for multiple CODECs

sekine.kazuma
Prodigy 40 points
Part Number: TLV320AIC3204

I am designing an AIC3204.
Multiple AIC3204s are planned to be mounted on one board.
The Design and Configuration Guide (SLAA404) says to separate AGND and DGND is shorted at one point, close to the device.

Where should I ground if I have multiple codecs?
I can't be near from all codecs.

  • 0
    TI__Mastermind 18490 points

    Hello,

    Thank you for reaching out. In the design and configuration guide, this is recommended for best performance. Getting the devices as close as you can to the shorted point will be okay, but its not necessary for device operation. If you have a multiple codec setup, it is also okay to have multiple places where the grounds are connected together. 

    Regards,

    Sydney Northcutt

  • 0 in reply to Sydney Northcutt
    Prodigy 40 points

    Does connecting multiple grounds degrade sound quality compared to a single point ground?
    Also, how does the sound quality compare to not having separate AGND and DGND areas?
    It will be used for AD/DA conversion of the telephone system, but if the sound quality deterioration is at a level that does not pose a problem for calls, we plan to ground it at multiple locations.

  • +1 in reply to sekine.kazuma
    TI__Mastermind 18490 points

    Hello,

    Connecting multiple grounds will not degrade the sound quality as it is done to prevent any coupling. If you do not separate the grounds and your digital and analog paths are not separated, you will get noise and the sound quality will be degraded. It is okay to not separate the grounds if you keep the analog and digital paths of your board separated, but this could be difficult with multiple devices. 

    Regards, 

    Sydney