Hi,
I want to read voltage of whetstone bridge by using ADC+internal PGA like AD7730but my problem is our strain gauge sensitivity is 100uV/V and strain gauge's supportable excitation voltage is 0.1Volt and we need atleast 10bits resolution so This requires a stable reading of 10uV/1024 or 10nV
by my calculating I know reaching to exactly 24 bit is big mistake, especially in my case that the excitation is very low, I think I should change my way and I need at first precision instrument amplifier with fix gain that magnitude bridge output and then I use AD7730, is it true? and what do you suggest me? or Analog Devices have better solution and IC
any help would be greatly appreciated,
Sincerely yours,
Siyavash.