I have been looking at voltage regulator datasheets all morning and I am wondering if I am taking a good approach to interpreting datasheets.
On my PCB I have a Mega324p that is reading an analog signal from a gyro IC. The Mega is also controlling a motor through an H-bridge. I recently changed to a different motor that has 1/10th the inductance of the old motor. Now whenever the motor activates am am getting like 20 mV p-p niose (IIRC) on my Gyro signal. I am getting noise from other un known places too.
I think I have a pretty good trace layout with ground planes under the analog portion of the board.
I am currently using two LP8340 v-regs on vcc and avcc which have a PSSR of <10Db at high frequencies. So I am hoping that I will get an improvement if I find a v-reg with higher PSSR. I have attached my excel sheet of the devices I am currently considering.
1) Is PSSR the right spec to be looking at?
2) What other specs should I look at?
3) Do you think that the ADP3335 is a good choice?