Part Number: MSPM0L1304
Other Parts Discussed in Thread: MSPM0C1104
Hi,
We are evauating the MSPM0C1104 and M0L1304 microcontrollers which have 12bit ADCs to replace existing FR series parts with 10bit ADCs in our measurement systems. We would like to use the internal 2.5 reference for the ADC. The operating range would be 0 - 60 degC.
The ENOB for both parts when ADC uses internal reference are specified in the datasheet as 9.8 and 10.2. The VREF TC is 200ppm/deg with an additional drift of 300ppm.
Taking a case where the ADC is calibrated at 20deg and then signal measured at 60deg, the VREF drift would be 8000ppm, not including the additional drift. For a 12bit ADC with a FS signal of 2.5V, 1LSB = ~600uV. Does this mean that the ENOB would drop to ~5.5 bit as the 8k ppm drift will add that much error into the reading? Correct me if my understanding is incorrect. If correct, then will correction for TC be mandatory for a resolution of full 4k points of the ADC?
Secondly, the lower spec part C1104 has TC listed as 75ppm/degC which is substantially lower than that for the 1304. Would the C1104 ADC give better results than 1304 if drift compensation is not implemented or am I missing something?
Please advise at the earliest convenience.
Best regards,
Tanmay.