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PCM1840: What is the benefit and disadvantage using DRE

Koyo Asaishi
Intellectual 1710 points
Part Number: PCM1840

Hi team,

I want to ask about DRE (dynamic range enhancer).
This function is very attractive but it is suspicious because the function is not default.

Why isn't this function default?
I would appreciate if you can share pros and cons using DRE.

Best regards,
Koyo

  • +1
    TI__Mastermind 23050 points

    Hi Koyo,

    The function of the DRE is documented in this app note: https://www.ti.com/lit/an/sbaa400/sbaa400.pdf

    The DRE algorithm runs at a rate much higher than the ADC modulator so that the algorithm can respond quickly enough to mitigate any artifacts that dynamically changing PGA gain might introduce. Even still, for some signals with large crest factors sometimes the DRE algorithm requires fine-tuning for optimal performance and not all customers will want to use this feature. This is why we give the option to disable it. For our software controlled devices, we also give the option to modify the DRE parameters like attack/decay for customizing the algorithm based on the expected signal and desired performance.

    The DRE algorithm dramatically improves the dynamic range of the device and extends the possible range of far field recording. However, using the algorithm does require resources from the DSP and so the DRE algorithm increases power consumption slightly and also limits the number of channels that could be supported at a given sample rate. For a comparison of the supported features in different modes you can refer to this app note: https://www.ti.com/lit/an/sbaa381/sbaa381.pdf

    Best,

    Zak