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TAS2557: Does TAS2557 Support 96kHz in Tuning or ROM Modes?

Wayne Chen (ex FAE)
Guru 15950 points
Part Number: TAS2557
Other Parts Discussed in Thread: TAS2558

Hi Sirs,

According to the TAS2557 datasheet, it support sample rate up to 96kHz. However, there is no 96kHz option with PPC3 GUI.
Would you please provide tips to bring it up to 96kHz SR? We tried to configure it by PPC3 GUI, but it was in vein.

TAS2558 datasheet:


Sample rate option on Book 0x00, Page 0x00, Register 0x2F



PPC3 default 0x2F=0x2A -> It works with 48kHz sample rate:




Wrote 0x2F = 0x2B -> OK with 12.288MHz MCLK, 96kHz LRCK



Wrote 0x2F = 0x2B -> No sound with 12.288MHz MCLK, 96kHz LRCK



The TAS2557 EVM works with 96kHz, 24.576MHz MCLK in ROM mode 1 and ROM mode 2. Does it mean that the TAS2557 an support 96kHz in ROM mode only?

OK with 96kHz SR, 24.576MHz MCLK

Distorted with 96kHz SR, 12.288MHz. 




Thank you and Best regards,

Wayne Chen
11/20/2020

  • 0
    TI__Guru* 84915 points

    Hi, Wayne,

    Thank you for the information you provided to describe this issue. We will take a look at it and will answer as soon as possible.

    Best regards,
    Luis Fernando Rodríguez S.

  • 0
    TI__Guru* 95225 points

    Hi Wayne,

    I will be trying this out early next week and will provide further comments and test procedure.

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

  • 0 in reply to Ivan Salazar
    TI__Guru* 95225 points

    Hi Wayne,

    Regarding 96kHz sampling rate, this is only supported in ROM mode, tuning mode is limited to 48kHz. This is mentioned in section 9.1 from data sheet:

    The MCLK is supported up to 24.576MHz, if you're using 96kHz you can proceed as below:

    • When using MCLK = 24.576MHz and FSYNC = 96kHz, you can select MCLK = 12.288MHz (half of actual MCLK signal) when generating the script in End System Integration
    • When using MCLK = 12.288MHz and FSYNC = 96kHz, you can select MCLK = 6.144MHz (half of actual MCLK signal) when generating the script in End System Integration

    If using 48kHz you can select the exact same MCLK frequency as you're using in hardware at End System Integration panel.

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

  • 0 in reply to Ivan Salazar
    TI__Guru* 95225 points

    Hi Wayne,

    Do you have any follow up questions on this one?

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

  • 0 in reply to Ivan Salazar
    Guru 15950 points

    Hello Ivan,

    Yes, I tried to make an I2C log when bring up the TAS2557 to ROM mode (attached file). It can support sample rates of 96kHz, 48kHz and 44.1kHz.





    TAS2557_96kHz_OK_PPC3_LOG.cfg

    However, there is no 96kHz sample rate option in the end- system integration page. The CFG we generated for 48kHz sample rate does not work with 96kHz SR.



    Thank you and Best regards.

    Wayne Chen
    12/02/2020