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← TechnologyWithin 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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