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EK-TM4C123GXL: oversampled conversion v.s single conversion

Tom Liang
Intellectual 510 points
Part Number: EK-TM4C123GXL

I have a confusion about oversampling.
According to Wikipedia, oversampling is the process of sampling a signal with a sampling frequency significantly higher than the Nyquist rate. How I understand is that, oversampling is sampling at a much higher sampling rate, compared to single conversion.

However, I found this information on the driver user guide, "Hardware oversampling of the ADC data is available for improved accuracy. An oversampling factor of 2x, 4x, 8x, 16x, 32x, or 64x is supported, but reduces the throughput of the ADC by a corresponding factor. Hardware oversampling is applied uniformly across all sample sequencers".

So is oversampling's sampling rate/throughput higher or lower than single's?

  • 0
    Guru 117850 points

    Might this vendor have (somewhat) "bent the definition" of, "Over-Sampling?"      Might a "more accurate" vendor description result from, "Multiple Sampling" - used in place of "over-sampling?"

    Now - "if the input signal is of substantially lower frequency than the ADC's conversion rate" - then and only then -  the MCU's "Multiple Sampling" may (somewhat/almost) serve as, "over-sampling."     Yet - without that appropriate frequency difference (source signal vs. ADC's conversion rate) use of the term "over-sampling" proves gratuitous.     (overstated)

    Vendor's method will degrade, "speed of the effective/final conversion" - thus trading (overall conversion) speed for the "averaging of ADC readings" - which will suppress the impact of a few,  "unclustered ADC readings."