I have a question about the CR circuit connected with the analog input of AD7789.
Is the CR value of Table 14 in the AD7789 data sheet applied to the CR circuit type of the attached file?
The RC combination in Table 14 of the Datasheet is the output impedance of the source that is driving the ADC inputs plus the impedance of the R/C filtering. In your schematic, you use R-C values that are acceptable to the AD7789 if the output impedance of the source is zero. However, in practice, the source will have some impedance. Therefore, the R-C values that you use in the filter may need to be reduced.
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