I was a little surprised to see the 3.3V VDDA Regulator TPS73133 connected to VCC, which is also 3.3V out of the switching regulator.
TPS731xx is a very low dropout regulator, but it needs some dropout to give ripple rejection (Datasheet Figure 14).
I measured with DMM and scope, VDDA has even more noise than VCC.
I think VDDA regulator should be connected to VIN, at the cost of some dissipated energy. Perhaps a Si diode to lower the dropout.