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Need information about ADC's external impedance

Question asked by michel.paul_henri on Aug 28, 2013
Latest reply on Aug 28, 2013 by John F.
Hi everyones,

In the datasheet for STM32F407xx, in the electrical characteristics part (12-bit ADC characteristics), they deal with the Rain value. they define it like that : used to determine the maximum external impedance allowed for an error below 1/4 of LSB.

What do they mean by "external impedance", is it the input impedance of ADC ou is it the maximum output impedance of sensor (or anything else) that can be plug on this ADC ?