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Doubt on TLV320IAIC3254 codec

Aravind .R
Genius 3175 points
Other Parts Discussed in Thread: TLV320AIC3254

Dear ALL,

One of my customer using TLV320AIC3254 Audio codec in their designs for public voice announcement applications.

 They are using same 230V AC supply (Single phase) for Public announcement system unit and two more fire alarm panels. When they switch on/off the power supply section of fire panels, their Audio codec which is present in public voice announcement system is getting disturbed and not giving any output. please need your inputs on how to resolve this issue.  They have also tested by giving AC supply to SMPS circuit present in Public announcement system and by giving a regulated DC power supply. They are facing issues in both cases. They though there may problem of using internal 1.8V LDO of codec, hence disabled it and tested using external LDO also but still facing same issues.

Schematics attached for review. please advise your valuable suggestions.

Rgds,

Aravind.Codec schematic.docx

 

  • 0
    TI__Guru* 84915 points
    Hi, Aravind,

    I would like to know if they are seeing changes on any input/output when the power supply section is powered on/off. Has customer checked each pin when the power supply of fire panels is enabled? (Specially, digital pins and power pins).

    Additionally, it is important to know that the digital and analog planes must be separated on the PCB and joined only in one point. This is often a cause of interference on the signals.

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    Genius 3175 points

    Dear Luis,

    sorry for delay in reply. 

    The digital and analog board is separated on the PCB and joined only in one point.

    The audio codec is working good in normal condition,but other panel power is ON/OFF there is no response from the audio codec(No audio output) .In this time once they have to re-Initialize the codec settings.They tested all voltage point ,but no change in voltage .Plz suggest to proceed further.

    Rgds

  • 0 in reply to Aravind .R
    Genius 3175 points
    Dear Luis,
    waiting for your valuable reply on above query. Also help to review schematics.


    Rgds/Aravind
  • 0 in reply to Aravind .R
    TI__Guru* 84915 points
    Hi, Aravind,

    The schematic seems to be in order. Actually, it sounds like an interference problem. Could you check all the clock lines? Is there any change when the other panel is on/off? What about the input signal? Is there any change?

    Best regards,
    Luis Fernando Rodríguez S.
  • 0 in reply to Luis Fernando Rodriguez S.
    Genius 3175 points

    Dear Luis,

    In power ON/OFF condition the input signal voltage is Zero.

    They checked all clock pins,but no difference in clock pulse(SCL,SDA,MCLK & Reset Pin). please advise whether it is possible to discuss it offline over email.

    Rgds/Aravind

     

  • 0 in reply to Aravind .R
    TI__Guru* 84915 points

    Hi, Aranvid,

    Could you give more information about the input signal voltage of the codec? You mentioned that the voltage is zero in power ON/OFF condition. When the input is zero, there shouldn't be an output signal.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0 in reply to Luis Fernando Rodriguez S.
    Genius 3175 points

    Dear sir,

    sorry for delay in reply. customer gave feedback when input signal voltage is increasing beyond certain level, codec is going to hang state and not giving any o/p.

    Once they reinitialise it again starts working.Do we have any possibility to limit input signal voltage to some level internally in codec itself setting any threshold. please advise. please also advise whether we can take this discussion offline over emails to close this in fast manner if possible.

    Rgds

  • 0 in reply to Aravind .R
    TI__Guru* 84915 points
    Hi, Aranvid,

    The analog input voltage absolute maximum rating is -0.3V to (AVdd + 0.3V). The device must not be exposed to these ratings to prevent damage to the device. The recommended input signal level in single ended mode is 0.5Vrms. It is suggested to limit the input range with an external circuit to avoid any undesired voltage.

    For any other question or comment, please refer to this E2E thread. We will try to solve this issue in a timely manner.

    Best regards,
    Luis Fernando Rodríguez S.