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sinara-hw / Urukul

4 channel 1GS/s DDS (AD9910 or AD9912 variant)
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Ic18 drop out #32

Closed hartytp closed 5 years ago

hartytp commented 5 years ago

Are you definitely happy with the drop voltage for IC18? We don't quite hit the recommended 3.25V for Vbias-Vo (particularly when tolerances are accounted for) so it seems a bit marginal to me from the data sheet...

hartytp commented 5 years ago

Well, maybe it's okay at the currents we're operating at?

gkasprow commented 5 years ago

We can always switch to 7V5

gkasprow commented 5 years ago

ah, max bias is 5.5V

gkasprow commented 5 years ago

We can also slighty increase the 2V rail.

gkasprow commented 5 years ago

I increased the P2V0 rail to P2V1 to satisfy Vbias requirements.

hartytp commented 5 years ago

Sounds good. The small change in power efficiency is worth it to make sure the LDO functions as expected.

Did you make sure to update the power budget table?

gkasprow commented 5 years ago

done obraz