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TLV320AIC3106 sampling rate

Manjula Ellepola
Expert 1335 points

Hi

I wish the data sheet had more info so that I don't need to bother you guys with these straight forward questions:

1. The DS says that the sampled data widths can be 16/20/24/32-Bit Data. But no-where can I find the actual data resolution of the ADC/DAC. Is it the same as the data widths or is it fixed 16 or 24 bit?

2. There is very little information regarding the dual rate mode. For example if I am using the dual rate mode for a sampling rate of 96kHz then is the analog input actually sampled at 96kHz with a use-full signal bandwidth of 48kHz  or is the signal bandwidth still 24kHz? That is does the signal bandwidth scale with the sampling rate? What about the decimation and other filters?


Thanks and regards

Manjula

  • 0
    TI__Guru* 84915 points

    Hi Manjula,

    Don't worry, there's no inconvenience with answering your questions.

    1.- The 16/20/24/32 Bit-Data refers to Audio Serial Data Word Length. The ADC and the DAC use a Delta Sigma modulator with an 1-bit sampling system. You may take a look of the following document for better comprehension: How delta-sigma ADCs work, part I.

    2.- There are some filters that scale with the sampling rate. For example, in section 11.3.3.2 Stereo Audio ADC, you may see that the -3dB bandwidth of the decimation filter extends to 0.45fs. The programmable filters are independent, so the sampling rate doesn't affect to them.

    I hope this helps you. If you still have questions, please let me know.

    Best regards,

    Luis Fernando Rodríguez S.

  • 0
    TI__Mastermind 46195 points

    Hi Manjula,

    For the ADC side, the limiting factor is the SNR. There will be little difference between 16-bit or 32-bit setting. For the DAC side, the SNR is 100dB, so choosing 20-bit resolution will help achieve 100dB. Choosing 16-bit will result in a bit less SNR (around 96dB + 2.6dB due to A-weighting).

    Regards,
    J-