UCC5870-Q1: internal VREF tolerance

David Stotz

Part Number: UCC5870-Q1

What is the tolerance of the internal VREF? We are trying to decide if we need an external VREF for the ADC and need to know the tolerance of the internal VREF.

11 months ago

+1 Daniel Norwood 11 months ago

TI__Expert 5801 points

Hi David,

Good to hear from you again!

The error of internal VREF contributes a significant amount of error to the ADC. This is seen in the fact that the INL is 1.2LSB with external reference, and -4/+9 LSB with internal.

More specifically, the 6 sigma max and min of the VREF rail are 4.08V and 3.95V respectively.

On another note, have you looked at our most recent driver, UCC5880? This updated driver has smaller package, improved features, and is our recommendation for any new designs. https://www.ti.com/product/UCC5880-Q1 We even have a full inverter reference design with this driver: https://www.ti.com/tool/TIDM-02014

Regards,

Daniel

0 David Stotz 11 months ago in reply to Daniel Norwood

Prodigy 140 points

Thanks for the quick response! This is exactly what we needed!

We will keep the UCC5880 in mind as a consideration for our next design iteration.

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UCC5870-Q1: internal VREF tolerance