Forum Post: RE: AFE5809 Power-up

Anton,

1) Let me check on in rush currents.

2)

From the note on fig.64: 

The AVDDx and DVDD power-on sequence does not matter as long as –10ms < t3 < 10ms. Similar considerations apply while shutting down the device.

So t3 is the time between Analog Supply ramp and Digital Supply ramp. Sequencing within each group is not critical. But t3 is referenced from last analog rail to first digital rail.

Thanks,

Chuck Smyth