How fast does the AD8253 settle after it is overdriven?
I use the AD8253 in a system that switches between small signals // high gain and large signals // small gain. If I accidentally have a large signal // large gain, for example, 10V input while in a gain of 100, how long will it take for the AD8253 to recover after the erroneous condition is corrected?
The AD8253 has very good settling characteritics compared to other instrumentation amplifiers. Under normal conditions, it settles to within 0.01% in 0.7 to 1.5 us for gains ragning from 1 to 100.
During over drive conditions, internal transitors can saturate and store charge in ways that can inhibit "recovery" or a return to normal operation. The AD8253 recovers from overdrive fairly well. Here is a screen capture of the part being over driven. The part is given a 10V input in a gain of 100. The 10V input goes to 0V and the part recovers in about 600 ns. After the recovery time, the part then settles in its usual 1.5 us time frame.