I am using an ADC MCP3424.
After breaking one of the ADC inputs, I was saw this thread: ADC input protection?
I also read Microchip app note TB3013. Figure 3 in particular:
The ADC's analog inputs need to be clamped at ± 0.3V of the supply rails.
The Vf of a schottky like BAT85 depends on the current flowing through it. So for a Vf < 0.3V, we would need a series resistance of 10k, to keep the current less than 1mA (assuming the Opamp Supply is +15V/-5V). Now the problem is wouldn't the 10k resistance slow down the charging time of the sampling capacitor and reduce my 18-bit accuracy? I am measuring slow moving DC voltages.
Is there any solution for the problem ?