Search FAQs on the left to see if your question has been answered. Click on the dropdown to view all of the documents associated with the product. If you can't find your question, click on Ask a Question

AD7799 AVDD Monitor 1.17V Internal Reference

When monitoring a voltage on the AVDD pin, what is the accuracy/stability of
the 1.17V internal reference used for analog-digital conversion?

 

For the AVDD monitor, an internal untrimmed 1.17V reference is used. AVDD is
divided by 6 and the attenuated voltage is used as the ADC input. Since the
internal reference is untrimmed, the conversion which reflects the ADC voltage
is not accurate. The AVDD monitor gives a coarse result rather than an accurate
result. The error could be as large as 1%.

Comments
Anonymous
Related