piclist 2000\04\24\214002a >
Thread: [EE] 24-bit A/D. Are We in the Twilite Zone Here?
www.piclist.com/techref/io/atod.htm?key=a%2Fd
face picon face BY : Sean Breheny email (remove spam text)



Hi Wagner,

At 07:48 PM 4/24/00 -0400, you wrote:
>some state it. Some of them have milli-volts of noise (white noise,
>pink, whatever), it is an intrinsic silicon noise, can't be removed,
>can't be filtered, there is NO capacitor can avoid it, stabilize or
>level it.  You just need to check the manufacturer document (specs

I don't see why you couldn't low-pass filter the output of the reference?
Prodiving that the thing that is using the ref isn't drawing much current
from it, you could just put a resistor in line and add a low-leakage cap
after it.

Even if the thing that needs the reference needs to draw a good deal of
current, you could buffer with a low-noise op-amp and still do the LPF.

Sean

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| Sean Breheny
| Amateur Radio Callsign: KA3YXM
| Electrical Engineering Student
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Subject (change) [EE] 24-bit A/D. Are We in the Twilite Zone Here?

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