Hello, I want to ask, it is necessary for INA326 instrumentation amplifier connect reference voltage to PIN5? I try to design this circuit on breadboard and i didn't know do i have to connect reference voltage to PIN5? If yes, what voltage? 2.5V or how much? And if I didnt connect anything to PIN5, will it be smaller gain, because I think ref voltage is substracted to output voltage of amplifier? I attach datasheet, circuit on 9 page (single supply).
http://www.ti.com/lit/ds/symlink/ina326.pdf
http://www.ti.com/lit/ds/symlink/ina326.pdf