In SLAU-384 1292 demo system. it use two separate DC DC regulator. what is the major consideration for this design. is ADS_AVDD required to be 0.3V lower than ADS_DVDD. I think may be to isolate the noise from digital signal, if I use a step down switch regulator to provide both MCU and ADS-1291, will this affect ADS-1291 analog signal. as shown in the schematic, I will cut two reduce cross point and connect them to output of TPS62170.
my purpose is to simplify the design and reduce the BOM cost.
appreciate any suggestion and help.
Sincerely,
David