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What is the equivalent circuit of the A/D type MCU to its external analog signal source?

April 26, 2017analog circuit equivalent external mcu signal source type

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What is the equivalent circuit of the A/D type MCU to its external analog signal source?

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Answer The equivalent circuit of the A/D type MCU to its external analog signal source is drawn as below: Notations: VA : external analog signal source RA : external analog signal output impedance AN0~AN7 : analog signal input pins CPIN : analog signal input pin input capacitance CPIN = 5pF D1, D2 : protection diodes on pad, VT=0.6V II : leakage current on pad, II = 1μA (max.) SS : analog signal sampling switch RSS : analog signal sampling switch equivalent impedance; ca.100/200Ω at 5V/3V CS/H : sampling and hold capacitance shown as below;