TMS320F280049: internal reference for ADC

Jack Tan80

Dear C2000 expert,

I see that the GAIN error of the ADC with internal reference has about +/- 45 LSB, it looks that this is pretty big, is there any way to do a self-calibration? Thanks...

over 5 years ago

0 Devin Cottier over 5 years ago

TI__Guru 60865 points

Hi Jack,

It is possible to do self-calibration, but this would require sampling a high-accuracy voltage source, then scaling all the ADC results via CPU post-processing.

A much better solution would be to feed the higher precision voltage source to the ADC VREFHI pin directly while using external reference mode instead of internal reference mode.

0 Jack Tan80 over 5 years ago in reply to Devin Cottier

Mastermind 7160 points

Hi Devin,

Thanks for supporting here.

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TMS320F280049: internal reference for ADC