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Within a microcontroller's ADC input protection circuit, which outcome occurs when input voltage exceeds clamping diode forward voltage?

A)Current shunts to supply rails
B)ADC exhibits diminished resolution
C)Sampling capacitor value shifts
D)Input impedance reaches maximum value

💡 Explanation

Input overvoltage causes the clamping diode to conduct; this is called forward conduction, therefore a large current flows to VCC or ground, rather than damaging the ADC input, because the low diode dynamic resistance limits the voltage swing.

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