Other Parts Discussed in Thread: OPA2197, , OPA197, OPA2140
Hello everyone,
We noticed an unexpected behavior when using OPA2141 as a replacement for a OPA2197 in a simple follower stage of a circuit. I did a simple simulation using TI-TINA and noticed the same behavior:
Using the OPA2197 as a follower, 5V single supply, with a sine source (2.5V DC level, +/-2.4V amplitude, 5Hz), the output is as expected, with the output reaching close to the rails (0.1V~4.8V):
Just replacing the ampop with a OPA2141 model results in a very different behavior
The output only goes from 0.15V to about 1.5V.
I noticed if I increase the supply to 8V or above, it starts working close to expected.
Based on the datasheets both models should work rail-to-rail from a 4.5V single supply.
Shouldn't the OPA2141 in this simple follower configuration, low freq signal, work exactly the same as the OPA2197 when using a single +5V supply rail?
Gabriel
