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TAS2564: THD+N measurement

Kailyn Chen
Genius 9560 points
Part Number: TAS2564

Hello，

When test the THD+N  according to the  application notes, the measurement results  are not the same with the datasheet, there is spike between 5Khz ~10Khz.

https://www.ti.com/lit/an/sloa068a/sloa068a.pdf

While the datasheet waveform is as following:

Could you please help to analyze the reason of the spike？ 

Best regards

Kailyn

  • 0
    TI__Guru* 95285 points

    Hi Kailyn,

    I'll double check the measurements on my side, although I think these results are still within spec values.

    Best regards,
    -Ivan Salazar
    Applications Engineer

  • 0 in reply to Ivan Salazar
    TI__Guru* 95285 points

    Hi Kailyn,

    The plots from data sheet were taken using the D2S filter on the PPC3-MB board as explained in section 7 from data sheet.
    This must be the reason of the difference in the test results, however the device is still operating as expected.

    If you plan on testing using D2S filter, please consider that output from the filter is smaller than actual power at the speaker, you'll need to track output power and distortion on separate channels from the AP.

    Best regards,
    -Ivan Salazar
    Applications Engineer