Other Parts Discussed in Thread: OPA376
Hello everybody,
I'm using the LOG114 exactly as depicted in the Datasheet on page 11 in dual supply configuration, I1 derived from the internal 2,5V with 2,5MOhms. The design is powered by a single 3.3V voltage source. The +-5V are derived as described in Figure 12 on page 19 on the datasheet.
The current, that has to be measured, is created by a reference voltage of 1V followed by a variable resistor. If the resistance is low (~100k) i have no problem. However, the vlogout signal is very very noisy. This gets even worse if the current to be measured gets lower. It seems the chip starts to oscillate.
Do you have any idea, what to do about it?
Best Regards
Christof