I have some basic doubts in ADC conversion. I am using AD7798 ADC. I am reading ADC values using AT90USB1287 micro controller using SPI communication. I am able to read ADC values perfectly but i have some doubts.
I had gone through the datasheet several times. I am setting Configuration register as "0x0230" and mode register as "0x0009". It means update rate as 16.7Hz and gain from "4 to 128".
When i try to read ADC value with 16.7Hz update rate it is taking more time but accurate values.
I would like to get values more fast than present time so i changed update rate from 16.7 Hz to 232Hz. Now ADC reading values more faster but not accurate.
How can i read ADC values more accurate and faster? Changing gain will effect ADC update rate?
Could anyone give me some explanation regarding Gain Vs Update rate vs accuracy?
From the datasheet i see that gain will effect on resolution and update rate will effect on signal to noise ration.