One of my customers is evaluating OPA2376 with low pass filter circuit like the follow.(But +IN=+100mV, V+=+5V, V-=0V)
The customer parameters are the follow.
R1 = 1k ohm.
R2 = 68k ohm
C = 0.01uF
They found that OPA 2376 offset became about 150uV when Vin in the circuit above is about +50mV.
Is this normal phenomenon of OPA2376 when input pin (+IN,-IN)voltage is very low?
We found Offset and Common-Mode Voltage graph on page 15 of OPA2376 datasheet.
According to the graph, the device offset voltage is bigger than the offset spec (5uV(Typ)) when input pin (+IN, -IN) voltage is very low.
Your reply would be much appreciated.