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TLV320AIC3254 Shutdown Cross Talk issue

Alain Busschaert
Prodigy 20 points
Other Parts Discussed in Thread: TLV320AIC3254

Hi everybody,

Currently I am using the TLV320AIC3254 with single ended inputs on IN1_L, and IN1_R.

When the device is powered-down, there is a serious crostalk (bleed through the device) to the HPL, HPR outputs.

Hereby attached the schematic diagram. Please help/advise.

Kind regards,

AlainTLV320AIC3254.pdf

8244.TLV320AIC3254.pdf

  • 0
    TI__Guru* 84915 points

    Hi, Alain,

    Welcome to E2E and thank you for your interest in our products.

    The crosstalk is a normal behavior of the codec. The analog bypass to headphone amplifier works properly only if the TLV320AIC3254 is turned on. So, to avoid the crosstalk, I suggest to use an input signal only if the codec is turned on.

    I hope this helps you. If you still have questions, please let me know.

    Best regards,

    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Prodigy 20 points
    Hi Luis,
    Thank you for the quick reply!
    Is there a "one or more" compatible TLV320 device that does not suffer from this shutdown crosstalk issue ?
    Otherwise I'll need to place a relay ( coil powered by 3.3V) between the HPL,HPR signals and the headphone connector.
    Any other suggestion/workaround highly appreciated! (I need to respin the PCB anyway...)

    Kind regards,
    Alain
  • 0 in reply to Alain Busschaert
    TI__Guru* 84915 points

    Hi Alain,

    All the TLV320 devices must respect the power supply voltage ranges for the correct behavior. The power supplies must reach a minimum value to work properly, so probably all the TLV320 devices will suffer this shutdown crosstalk issue when they are powered down.

    Regarding your PCB design, I suggest to take a look of TLV320AIC3254EVM-K User's Guide. In appendix section, you may find a suggested design and components for the TLV320AIC3254 codec. Additionally, I recommend to take a look of 12. Power Supply Recommendations Section  and 13. Layout Sections of TLV320AIC3254 datasheet. 

    I hope this helps you. If you still have questions, please let me know.

    Best regards,

    Luis Fernando Rodríguez S.