Just from a theoretical perspective I would like to know what is the source impedance seen by an ADC peripheral. The analog signal (1kHz) is produced by an Instrumentation Amplifier, goes through a low pass and then reaches the ADC.
I think that this impedance would be the output impedance of the InAmp plus the resistor of the LP filter.
The problem is that i can't find the output impedance of the InAmp (AD8226) in the datasheet, i tried others InAmps from analog devices but none had this information.
edit1: Just to make it clear, i know that the ADC has it own impedance, but the source impedance also affects the minimum acquisition time, that's why i'm trying to figure out this source impedance. Does anyone has any tip ?