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Thread: [EE] 24-bit A/D. Are We in the Twilite Zone Here?
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face BY : David VanHorn email (remove spam text)



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>2. Would it help to work on the analog -V regulator [79L06] a
>   little harder? I already have bypass and filter caps there,
>   and on the opamp, plus 50 mil power traces. OTOH, it does
>   get its power from the noisy ole 7662, and on the present
>   pcb, its fairly close to the PIC. [on the new pcb I had
>   already moved it away].

Couldn't hurt, (see my other note on op-amps as AM demodulators!)
It's probably layout driven, can you probe around with a spectrum analyzer
and see what surfaces? It may be that you can get 3-6dB just by re-routing
some tracks.

>3. Maybe something other than 79L06 would be better.

Hmm.. 79L10 followed by 79L06, with intermediate filtering?
Cheap, brute force, probably effective. Got that much headroom?


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Subject (change) [EE] 24-bit A/D. Are We in the Twilite Zone Here?

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