KL26Z ADC huge block of missing Codes

[nobodyKnows]

Hello,

I want to use the ADC of the KL26Z MCU in 16bit mode but it seems to be unuseable because of a huge block of missing codes - is this within the specifications or is something wrong?

Thanks a lot and best regards,

Maximilian

[xiangjun_rong]

Hi, Maximilian,

Regarding the above figure, I suppose that the X-coordinator is thesampling  time, the Y coordinator is the sample value, you sample an DC voltage (3.3V/65535)*61950=3.12V, but you find out that the codes from 61900 to 61960  are missing. Note that the ADC clock should be less than 12MHz if you use 16 bits mode.

I think it is possible, the DNL for the ADC16 is -1.1LSB to +1.9LSB in 12 bits mode, the difference is 3LSB in 12 bits mode, in 16 bits mode, the DNL is 3*16LSB=48LSB in 16 bits mode.

But we do not test the missing code for the ADC16 module.

Hope it can help you

BR

XiangJun Rong