ADC sampling issue when switching from K60 to K63

[paulgounot]

Hi Kinetis community,

I'm moving a K60 based product to K63 (just replacing the chip). Using

latest MQX SW 4.1.1.

I'm facing a serious regression with ADC. When injecting a 50Hz sine

wave to ADC input, I'm observing a sort of saturation below the ADC

dynamic range on the positive values, and a lot of degradation on

signal. Enclosed is a 3 page pdf file providing plots and more details.

As not being a ADC expert and as being new to K63, likely I'm missing

something but I can't find turning it out.

Any help from you will be highly appreciated.

Best regards,

Paul.

[danielchen]

Hi Paul:

Could you run the adc demo (bare metal sample code for Kinetis K64 120Mhz)  on your board, you can download the demo on the following link.

Kinetis K64 MCU Tower System Module|Freescale

Have a nice day,
Daniel

[paulgounot]

Topic is closed, but I forgot to update it with the conclusion. Issue was due to a HW flaw specific to K63 144LFQP package. Moved to K64 144LFQP and ADC works perfectly.