[time-nuts] Slightly OT: interest in a four-output, ultra-low jitter, synthesizer block?

jimlux jimlux at earthlink.net
Thu Jan 25 17:01:50 EST 2018

On 1/25/18 1:18 PM, Hal Murray wrote:
> lajeunesse at mail.com said:
>> I'm sure you know the 1.8V supply regulators should not be fed from VDDA
>> (3.3V), but I'll mention it anyway.

usually, it's so that noise coupled back from the part doesn't back in 
through the 1.8V.

If you have a (say) 5V supply and you generate 3.3Vdd with one regulator 
and 1.8V with another regulator, you (should) have better isolation. 
Trees rather than cascades.

> Why not?
> That sounds like the sort of issue I should understand but I'm coming up
> blank.

More information about the time-nuts mailing list