AMC7823: External reference voltage when we use it with 3.3V.

Kimitaka Kawase

Prodigy 30 points

Part Number: AMC7823

I'm using AMC7823 with 3.3V for AVDD.

Can we use a 2.5V- external reference voltage?

Or do we have to use only 1.25-external reference voltage?

What happens if we use a 2.5V- external reference voltage?

over 1 year ago

0 Paul_Frost over 1 year ago

TI__Guru 52663 points

If the VREF×2 is greater than AVDD, you would expect large full-scale and gain errors. DAC linearity is not guaranteed even for the 3.3V of the ideal 5V range when the reference condition is violated.

Thanks,

Paul

0 Kimitaka Kawase over 1 year ago in reply to Paul_Frost

Prodigy 30 points

Dear Paul,

Thank you very much for answering to my questions.

I also confirmed the range of external reverence voltage in the spec sheet.

It writes from 1.20 Vto 1.28 Vwhen AVDD is 3V.

Therefore, I will decide to use internal reference voltage.

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AMC7823: External reference voltage when we use it with 3.3V.