A well filtered and stabilized 3V (not 3.3 V) would be better.
That LSB is mostly noise, precision doesn't mean accuracy.
1.8V can be up to +10%
That LSB is mostly noise, precision doesn't mean accuracy.
1.8V can be up to +10%
Also look at Pico 2 datasheet (the board), it gives more hints about ADC.The maximum ADC input voltage is determined by the digital IO supply voltage (IOVDD), not the ADC supply voltage
(ADC_AVDD). For example, if IOVDD is powered at 1.8 V, the voltage on the ADC inputs should not exceed 1.8 V + 10% even if
ADC_AVDD is powered at 3.3 V. Voltages greater than IOVDD will result in leakage currents through the ESD protection
diodes. See Section 14.9, “Electrical Specifications” for details.
Statistics: Posted by gmx — Wed Feb 05, 2025 9:12 am