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From: "Reala" <->
Subject: How to estimate the accuracy of ADC IC?
Date: Tue, 10 Dec 2002 16:05:37 +0800
Organization: IMS Netvigator
X-Newsreader: Microsoft Outlook Express 6.00.2600.0000
I have a task to evalute the accuracy of ADC IC.
This a simple dual slope 10bits resolution Analog to Digital convertor
(about 50 FETs in the ADC).
I find that the performance of this IC is not very good, because the
is varied if i used different reference resister and capacitor.
Even though i use a fix resistor and capacitor, the delta (max - min) of
is about 6 (at the output value ~= 650) in same testing condition.
However, I need to find out the accuracy of this IC.
What is the definition of "accuracy for ADC IC?
resolution = accuracy?
It is interesting that the delta increase as the output value increase.
eg. delta = 2 for output = 100 ....so the error = 2/100 *100% = 2%?
eg. delta = 6 for output = 650 ....so the error = 6/650 *100% = 1%?
so..what is the precentage error?
I check the datasheet of other ADC...it say the accurancy is +/- 1 bit..
How can I acheive this? I think that the overall accurancy will be
decrase by other
components...For example, if i want to develop a multimeter by ADC
I estimate the accurancy of the multimeter?
In the IC design level, what is the consideration to acheive a specific
In the fabricated level, how to ensure the performance between each chip
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