I need to amplify a 100mv signal to 0-5V or 0-10V that I can read with my arduino.
I think the HX711 is unsuitable because of the lower supply voltage (<5volt).The sensor is rated for 10volt, so the INA125 with it's 10volt reference would be a good match.Supply the INA with 12volt regulated, IAref to ground, and a 1:1 voltage divider on the output.Leo..
My understanding of "rated voltage" is the maximum voltage you may apply accounting dissipated power - accuracy loss due temperature change. Nothing prevents to apply low voltage, down to 1V or less.
That's what I also understand. The only thing that also will go down with supply voltage is output voltage.I think the Sparkfun HX711 is set for 4.3volt bridge supply.Sensor output will be 43mV max at that voltage.That has to be weighed against the specs of the amplifier and A/D converters.