forum post : https://forum.pjrc.com/threads/61451-Teensyduino-1-53-Beta-2?p=243846&viewfull=1#post243846

Also note: TD 1.53 is in Beta - is ADC ready to get an update in TeensyDuino? Short time frame with new IDE 1.8.13 release.

The example : \libraries\ADC\examples\ adc_dma
uses unsupported setcommands:

// adc->setAveraging(8, ADC_1); // set number of averages
// adc->setResolution(12, ADC_1); // set bits of resolution
adc->adc1->setAveraging(8);
adc->adc1->setResolution(12);