Hi,
I have to measure strain & circuit is attached.
1. SG nominal = 1000 ohms , with min = 900 ohms during compression & max = 1100 ohms during tension.
2. I have used R5 to generate Vref for ADS1248.
R5 produce Vref = 0.6V.
3. Minimum resolution I need is = 25nV.
Max voltage = +1.282mV
Min voltage = -1.22mV
4. I have used PGA = 128.
My questions are:
1. What will be resolution is? Is it:
resolution = Vref / (2^23 * PGA)
= 0.6 / (128 * 8388608) = 0.55nV.
2. In datasheet I have read that noise is in uV with Verf = 2.5V.
But in my case vref is also small & PGA = 128.
3. Any comments?
