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Adaptability of MCLK for TAS2557

tomsh shen
Prodigy 30 points
Other Parts Discussed in Thread: TAS2557

Hi team
    

When we use PPC3 tool to generate the firmware of TA2557, we choose the MCLK as 24.576 MHz (see attachment MCLK. jpg), and upload the firmware to TAS2557, but the MCLK provided by our CPU to TAS2557 is 12.288MHZ.We find it normal to broadcast in such a setting.

Is my configuration reasonable?Are there any safety hazards in the back?

If not, then how to configure it is normal?


  • 0
    TI__Guru** 109595 points

    Hi Tom,

    It is most likely the device is working fine because these frequencies are exact multiples.
    However I would recommend that if your host is using a different MCLK frequency, you should generate a new configuration based on the new frequency.

    Best regards,
    -Ivan Salazar
    Applications Engineer - Low Power Audio & Actuators

  • 0 in reply to Ivan Salazar
    Prodigy 30 points

    Hi Ivan

    I have now set the CPU's MCLK for TAS2557 to 24.576MCLK and found another problem

    I play swept audio source files (20Hz ~ 20KHz), can not play above 3KHz

    When the MCLK of the previous CPU is 12.288 MHz, the sweep audio source can be broadcast to more than 3K Hz


    What is the reason?

  • 0 in reply to Ivan Salazar
    Prodigy 30 points

    Hi Ivan
    Frequency sweep audio source :20_20K_61p.wav
    The test results: NA582 V3_MCLK_24_576MHz_SYS with SPK_error message.png

    MCLK changed to 24.576MHz,
    AR rate 48K HZ

    When playing the swept sound file (20_20K_61P.wav), it can only play to close to 3KHz, but cannot play to 20KHz (The error message measured by AP is shown in the attached file below


  • 0 in reply to tomsh shen
    TI__Mastermind 18545 points

    Hello, 

    Does this same issue occur if your CPU is left at 12.288MHz and the PPC3 values is changed to match that instead? 

    Thank you, 
    Justin Beigel

  • 0 in reply to Justin Beigel
    Prodigy 30 points

    Hi
        I haven't tried yet. I will try later.
       What does the value of PPC3 matter?

  • 0 in reply to Justin Beigel
    Prodigy 30 points

    Hi Justin
         

    After testing, it was found that

    Only when the CPU provides MCLK of 12.288 MHz and PPC3 sets the value to 24.576 MHz can the broadcast Frequency sweep audio source to about 12 KHZ (also not a normal phenomenon, normal can broadcast to 20KHZ), other Settings are very abnormal, can only broadcast to about 3kHz.



  • 0 in reply to tomsh shen
    TI__Mastermind 18545 points

    Hello, 

    Thank you for the additional information. I will work with Ivan and we will have a response for you shortly. 

    Best Regards, 

    Justin Beigel