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PCM6240-Q1: DR definition

Shinji Tsuji
Genius 14239 points
Part Number: PCM6240-Q1


Hi team,

Could you explain the definition of the DR(Dynamic Range, A-weighted) for differential input?

Does the test condition blow means the input is -60dBFS (FS=10Vrms)?

Could you explain why -60dBFS is selected as input level?

TEST CONDITION

"IN1 differential AC-coupled input selected and –60-dB full-scale AC signal input, 0-dB channel gain"

regards,

  • 0
    TI__Mastermind 23050 points

    Hi Shinji,

    This is an industry standard that has been largely adopted for audio devices. This has historically been done for audio devices to make it easier to measure the RMS noise floor, which can be complicated by low level idle tones. Some systems automatically mute below a certain signal level so doing this also prevents that ensures a true comparison to the noise floor. The -60dBFS tone mitigates these issues and is low enough level to not produce measurable distortion products in the output.

    In short, this is an industry standard measurement and is essentially the same spec as SNR for an ADC!

    Best,

    Zak