16 bit adc instability problem on twr-mkv58f220m development board

paoloziveri1 — Wed, 05 Feb 2020 10:58:29 GMT

Hello,
we are working with the kv58f220m development board and we are testing the 16bit ADC inside the micro.
We noticed that the ADC has an output value that oscillates around 400/500 points, as you can see from the document(AD_instability.pdf), then we tried to filter the power supply as suggested by the development board scheme twr-k70f120m (document ) but despite the hardware modification that allows filtering the result has remained roughly the same.
we would need to reduce this instability as much as possible, but to date we have not yet found a solution. Has anyone faced a similar situation yet?
Thank you.

Re: 16 bit adc instability problem on twr-mkv58f220m development board

Sabina_Bruce — Thu, 06 Feb 2020 18:18:29 GMT

Hello Paolo,

For ADC design considerations please follow the next two documents:

AN5250

Improving my ADC design

Also are you using a DC input signal as a reference?

Best Regards,

Sabina

Kinetis MicrocontrollersのトピックRe: 16 bit adc instability problem on twr-mkv58f220m development board

16 bit adc instability problem on twr-mkv58f220m development board

Re: 16 bit adc instability problem on twr-mkv58f220m development board