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Kinetis KL series differential ADC

Question asked by Peter Kisfaludi on Sep 21, 2017
Latest reply on Sep 26, 2017 by Fang Li

Hi NXP,

 

My question is about the differential ADC built into KL series (specifically, I am interested in KL46 and KL28, but I guess the question is generic enough).

 

Is the differential ADC implemented as doing 2 single ended measurements very quickly after each other, or is there a real differential amplifier somewhere in hardware?

 

If it is a true differential measurement, then I wonder why the max and min input to the pins is specified as Vss ... 3.6V. In differential measurements, the benefit (among others) is that there can be a DC offset on both of the differential inputs, but it will measure the difference.

 

Thank you and Best Regards,

 

Peter 

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