[EE] 24-bit A/D. Are We in the Twilite Zone Here?
andy howard email (remove spam text)
> From: "Dan Michaels" <LYNX.SNI.NET> oricom
> >>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?
> On my new pcb layout, I've already moved the analog v.regs further
> from the digital cktry, improved their hi-side bypassing, and
> increased the area of gnd planing around them. I'll see if this
> helps when I get in the new pcbs.
Ah, speaking of linear regs, I've often found they can exhibit very high
RF frequency instability. All my designs now have decoupling (10nF and a
few tens of pF) *directly* at the pins of the reg. I found that having
any significant length of track between pins and the decoupling didn't
always clear it up.
See also: www.piclist.com/techref/io/atod.htm?key=a%2Fd
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