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PCM1860-Q1: PCM1860-Q1 Full-scale voltage input

user6388211
Prodigy 250 points
Part Number: PCM1860-Q1

Hello team

The full scale input level in single-ended mode is Max 2.1Vrms, what about the typ / min value?

I want to check the clip of the input signal level and the output digital level.

Ex)

2.1Vrms － 0% / + 15% (3.3V @ VA input voltage value)?

or

2.1Vrms ± 15%?

  • 0
    TI__Guru 62765 points

    Hello,

    The gain error of the ADC and PGA will determine the amount the full-scale input level varies.  The gain error specification for the PCM1860-Q1 is featured in the "Accuracy of PGA+ADC" specification which is +/-0.5dB.  So, the typical full-scale input range is 2.1Vrms and this will vary around by about +/-0.5dB IC to IC.  While there is not a min/max gain error specification, knowing that the THD+N is specified with a -1dB input and a minimum acceptable level you can infer that the gain error is never large enough that a -1dB input signal will clip or it would fail the THD test.

  • 0
    TI__Mastermind 23050 points

    Hi,

    We don't spec the min full scale range but it is generally very close to the max spec given. The PGA + ADC has a typical accuracy around 0.5dB, or around 6%. Given that the input range is a max spec the device is trimmed under this limit so you can generally expect the clipping to occur somewhere between 1.98Vrms and 2.1Vrms, though it may occur slightly under this depending on the exact trim of the device.

    Best,

    Zak