TMS320F280049: The internal ADC reference of F280049

Z YM

Part Number: TMS320F280049

Dear TI

In the Application Note《VREFHI Driver Design for C2000 ADCs》,recommend that “For C2000 devices with an internal reference, the internal reference is always a better performance option than using VDDA as the reference”.So Iwant to know how much is the internal ADC reference of F280049 DC accuracy, temperature drift？

over 1 year ago

0 Benjamin Collier over 1 year ago

TI__Mastermind 36526 points

Hi,

We do not have these exact specs, but we do guarantee all ADC specs in the datasheet for internal reference and across temperature, unless they say otherwise. We only have a few specifications with different limits for internal and external reference.

Best Regards,

Ben Collier

0 Z YM over 1 year ago in reply to Benjamin Collier

Prodigy 70 points

In The datasheet of F280049,The gain erro of Internal reference is much larger than external reference.Is that ture and why? Is there a way to improve?

0 Benjamin Collier over 1 year ago in reply to Z YM

TI__Mastermind 36526 points

This is correct, this is something that we have determined with characterization and test data.

There is not a way to improve this, but this data is worst case across temperature. Performance tends to be much better around room temperature.

0 Z YM over 1 year ago in reply to Benjamin Collier

Prodigy 70 points

Whether the gain error includes the error of the reference voltag(VREFHI)? If it is not included, can it be understood that when the accuracy of the external reference voltage is less than 1%, the external reference is actually superior to the internal reference

+1 Benjamin Collier over 1 year ago in reply to Z YM

TI__Mastermind 36526 points

Hi,

The inaccuracy of the internal reference is the reason for the larger gain error with internal reference.

With a very precise external reference, the external reference can perform better than internal reference, as the datasheet suggests.

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TMS320F280049: The internal ADC reference of F280049