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I'm going to share a power supply for ADS6125, DAC7760 and LMK04208, The load 2 is LMK04208. Is it ok? Is a linear regulator necessary to replace the switch regulator?
I expect you'll be fine with a switcher --> LDO. Does the power webench sim show expected spikes from switcher and the PSRR you will get from the LDO?
Please refer to the LMK04208 Users Guide schematic and datasheet section 9.3 and 10 for more info on power supply for LMK04208. If you're using a VCXO, that will be the most sensitive supply to noise.