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SAADC very high noise.

Luk3

Hardware: nrf52 DK Software: SDK v13

I want to use SAADC to sample some analog data (main function of my device), but It seems to be noisy. In attachment spreadsheet with chart and recorded data.

Reference = VDD/4, input = VDD, gain = 1/5, sampling triggered by app_timer with interval 200 ms.

Is it normall for nrf52 to have as much noise as I have?

Spreadsheet

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    SD in enabled but an advertising isn't. With the internal reference and gain 1/6 results are very similar. I also tried to measure a 3V coin battery, no difference. Supplying board with battery instead of USB without effects. I checked schematic and between regulator and nRF52 is diode placed. Schotky diode Vf varies from load, can it be source of that noise?

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  • 0

    SD in enabled but an advertising isn't. With the internal reference and gain 1/6 results are very similar. I also tried to measure a 3V coin battery, no difference. Supplying board with battery instead of USB without effects. I checked schematic and between regulator and nRF52 is diode placed. Schotky diode Vf varies from load, can it be source of that noise?

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