I have been using the INA114 in my design, but wondering if I can use the INA826 instead. I cannot figure out what the difference between these two instrumentation amplifiers is. The CMRR is nearly identical. Is it just the extra gain the INA114 is capable of? There are so many different instrumentation amplifiers out there and I’ve been scouring the datasheets trying to understand what makes one more expensive than the other. The INA has a higher operating current as well. I must be missing something.I am amplifying a wheatstone bridge signal.
Additional to the important point about the age of ancient chips Vladimir Cravero mentioned in his comment, there is also a drawback of the newer chip:
Input bias current: The INA114 has input bias current cancelation and can achieve +-2nA of input bias current. The INA826 goes up to 65nA or even 95nA over full temperature range. Depening on the source impedance of your signal source that might make a difference or it might make none.