RE: frequency of analog input pins

mikefraguglia — Tue, 06 Oct 2026 15:55:50 GMT

Hi, I need to read analog input signals which have a frequency >10kHz. On the BMD-380 (nRF52840) module that I'm using, there are only two Analog Input pins which are not frequency sensitive. Do the same concerns apply for analog inputs?

RE: frequency of analog input pins

Kazi Afroza Sultana — Wed, 21 Dec 2022 14:34:08 GMT

Hello,

Low frequency I/O is a signal with a frequency up to 10 kHz. You cannot use the pins which marked as ''Low frequency I/O only'' for high frequency peripherals.

''Radio performance parameters, such as sensitivity, may be affected by high frequency digital I/O with large sink/source current close to the Radio power supply and antenna pins''

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/pin.html?cp=4_2_0_3_2#concept_rfc_x1z_2q

So, if you're planning to use the radio when LEDs are running and configured in for high drive, you cannot use these pins which are only for low frequency I/O only.

Thanks.

Best Regards,

Kazi Afroza Sultana