Can you use the internal 4.3V ADC reference if your supply is only 3.0 Volts?
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Good. But you are still limited to 0 to VDDS on the input even though this virtual reference is 4.3V? That's the remaining thing I'm trying to figure out... how you can have an equivalent-to-4.3V reference but still limited to VDDS under absolute maximum ratings on the analog input pin itself ...
Yes, the maximum input swing is from 0 to VDDS with voltage scaling enabled. To utilize the full range of the ADC you must limit your input signal to 1.49 V and disable voltage scaling internally.
-Simon
Hi Simon.
In my application there is only a power source of 1.8V for the analog circuit.
In this way, I need to limit the ADC input to 1.48 (below the damage limit of 1.49V) once a boost circuit is not an option. Do you have any referenced suggestion to do this?
Thanks in advance,
Mauricio
Hi Mauricio,
You can use a voltage divider (two resistors) to scale down the signal.
-Simon