SPRUJ79 November 2024 F29H850TU
Using a dedicated input channel, gain balancing between multiple ADCs can be performed. By calculating the relative gain error between the ADCs, conversion results can be post-processed in software such that each ADC has the same output for each equivalent input.
To perform gain calibration, configure the ADC SOC to sample channel ADCIN21. On this channel, the voltage sampled by all ADCs when triggered is (VREFHI * 0.9).
ADC offset can also be calibrated by using dedicated input channels to measure the reference low voltage. VREFLOAB can be measured by sampling channel ADCIN22 on ADC-C, ADC-D, and ADC-E. VREFLOCDE can be measured on ADC-A and ADC-B by sampling channel ADCIN17 for the odd channel, and ADCIN22 for the even channel.