I'm using the INA331 with a gain of 5 and Vs = 5V. I'm getting a maximum Vout of 4.3V. Data sheet states Vout will not go to rail with gains < 10 (only when gain set to 5). However, it doesn't provide information as to how close it will get and what this depends on- the output load? What can I expect for max. Vout from part-part? Is there another part that doesn't have this shortcoming? The INA231 has the same thing.
Hello Dan,
We have measured the linear operating region for the INA331 at a gain of 5V/V and at a higher gain (26.6V/V to be exact). The measured data at a gain of 5V/V corresponds well with the plot given in the data sheet and shown below. Therefore I would use the plot below to determine your output swing for gains <10V/V. When measured in a gain of 26.6V/V the output was in fact rail-to-rail. These limits depend more on internal amplifier common-mode input and output swing limitations than on output load.
If you are looking for a single-supply RRI/O instrumentation amplifier even for gains <10V/V, I recommend evaluating the INA326.
I hope this helps!
