I'm planning to use the AD4115 but I can not get a clear answer about the voltage ranges in the input (with buffer). I use AVDD=5V.
The datasheet says +/-10V (I suppose with the VRef=2.5V). now, If I take the given formula Code = 2N – 1 × ((VIN × 0.1/VREF) + 1), the input range should be +/-25V in order to have the full range. Why is it limited to +/-10V ?
On the other way, the datasheet says page 24 :" The AD4115 voltage input pins are specified for an accuracy of ±10 V" and there is the picture 26 where it is given at +/-20V, or even at +/25V with some limitations. So it is very confusing. What is happening between 10 and 20V interval ?
Now, the VRef can be external, up to AVVD. if I use an external 5V reference voltage, what happen ? What are the ranges ? Is the given formula still correct ?
My goal is to measure voltages up to +/15V.
if someone can make this less confusing...
Thanks in advance,