My customers are considering using AD7793.
So I got a question.
#1 What is the accuracy of the AVDD monitor function?
#2 How is the 1/6 attenuation done with the AVDD monitor function done?
1. The AVDD monitor is not accurate. The error is about +/-10% typically. This function is useful to get a coarse reading of the analog power supply. It does not give an accurate value.
2. Using an internal resistor network, the voltage between AVDD and AVSS is divided by 6. This attenuation voltage is then applied to the modulator via the on-chip mux.