Part Number:INA326
I'm currently designing an amplifier circuit for a photodiode. The photodiode uses a trans impedance amplifier initially but, to keep the bandwidth up, this has fairly low gain. In order to boost the signal later on I've decided to use an instrumentation amplifier.
In choosing one of these I've been looking for low noise, high stability and low thermal drift. I came across the INA326 previously and thought to apply it here: it has some very clever current mirroring going on which removes the need for internal trimmed resistors. However, in comparing it with e.g. the INA103, I found that it underperforms on most all figures of merit.
If that's true then fine, I can use the INA103 instead, but I think I must be misunderstanding the INA326's strengths. Surely the added internal complexity of the current mirroring circuitry must have been done for a good reason, but so far as I can see all it achieved was to limit the bandwidth by 4 orders of magnitude, which makes me think I must be missing something.
So my question is, other than the past-the-rail output, what advantages does the INA326 have over more conventional instrumentation amplifiers (particularly in unity / low gain systems)?
Thanks in advance!
Charles