PSN-L Email List Message

Subject: 24 bit A/D
From: barry lotz gbl@.......
Date: Mon, 07 Feb 2000 22:57:24 -0800

I received a new issue of Sensors. There is a new ad for a 24 bit A/D
from Cirrus Logic. See

BTW- I have been running the 16 bit Burr Brown A/D  at an oversampling
rate of 30 readings per sample. Someone mentioned on a previous listing
that oversampling was the equivalent of a higher resolution A/D. I agree
with the consept that multiple readings will give one a more accurate
sample value but I wonder how I would get more than a count of  =B1 32768
(higher than 16 bit) ? The only way I see this occuring is to take say
30 readings per sample and then only divide by 15 rather than 30. Is
this a valid approach or mathmatical hocus pocus?  Could the individual
who wrote  the way to calculate the effective A/D resolution with
oversampling repost the way it's calculated.


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Larry Cochrane <cochrane@..............>