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What led me in this direction was the mention of DSP in the data sheet and here on pjrc as "DSP extension instructions". Looks like those are for audio frequencies. The data sheet for the AMC3336 has 9 MHz min clock but I just ran a test down to 1 KHz and the data looks valid - probably not...

I'm working on a circuit that uses a AMC3336 isolated ADC and need to convert the output to a reading of the applied input voltage. Sinc3 filter is mentioned in the data sheet and I am acquiring a C2000 dev board but in the meantime I wanted to see what a Teensy 4.1 would be capable of using...