I need a strain gauge amplifier + ADC driver for an differential 24 bit ADC (AD7791) with low sample rate,
so a 0 to 10Hz bandwith of the amplifier is sufficient.
The challenge is: It must have lowest possible DC to 10Hz Noise at a gain of 800, complexity doesn't matter.
Also high gain stability and high linearity (< 50 ppm) is needed.
The strain gauge resistance is 1K, ratiometric measurement needed.
5V single supply + Rail-Rail-out would be nice but is not needed.
I've looked the circuit of EVAL-CN0216-SDPZ, which uses the ADA4528 auto-zero-OPA, but noise performance is not perfect -
data sheet ADA4528: 100nVpp 0.1 Hz to 10 Hz Noise. And
Then I found an chopper amp circuit with 40nVpp 0,1...10Hz noise (http://cds.linear.com/docs/en/datasheet/201a23fb.pdf at page 9).
But this circuit don't have a differential input nor a differential output.
Does anyone knows a (chopper-) circuit that has lower peak-peak noise than ADA4528?