Looking at Ad8253 (IA) datasheet, seems like it's suitable for driving Ad7324 directly.
Could anyone confirm this ?
Or do I need an AD8021 for example ?
The closest driver we have is for the AD7321. Please see here. You should be able to edit this as required for the AD7324.
I just want to add that the AD7324 is set to sample at sample rate less than 0.5M.
Page 21 of AD7324 datasheet says that it can handle source impedances as high as 4.7 kOhm before THD degrades. The output resistance of the AD8253 is not stated, but it will likely not be that high.
My calculations (can someone confirm them?):
The acquisition time of AD7324 is given at page 18 of the datasheet. Say, we assume that the output resistance of AD8253 is 500 Ohm and we use 21.5 pF for the ADC input capacitance, then the acquisition time is 172 ns.
The ADCs input voltage must settle within 172 ns to a 13 bit level, for a full scale step (-10V to +10V, e.g.).
Figure 45. (AD8253):
20V, settled to 0.01%, G=1, RL=10kOhm --> 1200 ns
Figure 21. and 22. (AD7324) give the relation between Rin, frequ. and range.
The AD8253 is not suitable as driver, when your analog signal is not small signal and/or the input frequency is high and/or has steps (high dV/dt).
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