How to calculate the input impedance of ADC pin for LAUNCHXL-F28027F

OBW0549

Joined Mar 2, 2015
3,566
You won't be able to calculate a specific input impedance for the ADC inputs; "high impedance" is about as close as you'll get.

The electrical characteristics of the ADC are listed in Table 6-26 on page 76 of the TMS320F28027 datasheet. ADC inputs have a typical parasitic input capacitance of 5 pF and typical leakage current of ±5 μA. Figure 6-20 on page 78 gives the equivalent circuit for an ADC input pin.

That's all the information that's available.
 
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