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ADC reads low through a divider

A 1 MΩ / 1 MΩ divider feeds an ADC pin with the shortest sample time. Readings are low and change with the channel read before it. What is the likely cause?

A.The ADC reference voltage is too high for this inputB.The sample capacitor cannot charge through 500 kΩ in timeC.The divider resistors are far too accurate for the ADCD.The ADC clock is too slow to convert the signal

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ADC reads low through a divider

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