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