I put a simple current source on a circuit to drive a UV LED with a constant current.
According to the LTSpice simulation setting 0 V at the signal input results in 0 A through the LED. But when I build up this circuit I get a non-zero current for 0 V. Ergo the LED is glowing. The inputs of the AD8616 are both almost zero (the feedback is a maybe 3 mV higher because of the small current going through the fb resistor). However the AD8616 drives 600 mV at the output. The noise floor on GND is quite high in amplitude (approx. 2 mV).
Can anybody explain this behavior?
EDIT: I replaced the opamp. Now I get a true 0. I can imagine, that if you leave the supply voltage connected, and you set a jumper to a new position (to switch to another input signal), the opamp drives much more than it should and dies.