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PCM1860: THD+N at full scale

KANJI SHIBATANI
Mastermind 6205 points
Part Number: PCM1860

Hello

I can find another POST following,but please allow me to have  question about PCM1860...

 

https://e2e.ti.com/support/data_converters/audio_converters/f/64/t/490550

 

Q1

THD+N=-93dB at -1dBFS ( 0.87Vrms) , but how much THD+N in case 0dB (2.1Vrms)?

My custer had tested and it was -54dB ( is it make sence?)

We can find  input amplitude vs THD+N in Fig5 page14, but I can not see in detail at 0dBFS point.

 

Best Regards

  • 0
    TI__Guru 57800 points

    Hi, Shibatani-san,

    The measurement for the THD+N of the part should be referenced to the full scale signal in the digital domain, this is done to discard any possible mismatch or loss on the analog input signal. Based on this, I measured the THD+N in the EVM and obtained that when the input signal is regulated to get 0dBFs, THD+N is about -77dB. When the input is -1dB, the THD+N is -93dB. The part was configured with differential inputs (full scale=4.2V).   

    Best Regards,

      -Diego Meléndez López
       Audio Applications Engineer

  • 0 in reply to Diego Melendez
    Mastermind 6205 points

    Dear Diego-san

    Thank you very much for your data.

    I will discuss with customer.

    Thank you again