I am making a power management circuit for multiple sensitive ADCs that will get power from it.
The basic idea is kind of like this:
Where this circuit I'm about to make will be a power hub of 8 power sensitive ADC. The ADC circuit already has its own filters designed as recommended by it datasheet (PSRR 60dB@100kHz and 90dB@100Hz) which should be theoretically enough, but since I don't have much control and information on how clean the main supply is, it maybe total trash or really good.
Hence I would like to place something on the middle. The ADC circuits need 5V, hence I need a regulator and I found this which is advertised to be good at noise sensitive application TPS7A47. Is there something I can do to further give better protection against noise from the main supply? Also for inputs above 5V there is nothing to worry since the PSRR would kick in but for inputs that are exactly 5V (and output 5V) from what I know an LDO does not have PSRR in these situations so how can solve this issue?