Initial conditions the LMH6518 set to Low Gain mode.
The +IN of LMH6518 is connect with a DC(+2V) + Squared waveform(2Vp-p 100kHz).
The -IN of LMH6518 is connected with a DC(+2V).
The VCM is connected with 1.25V from ADC08D1000.
And, the bottom of squared waveform is calibrated to the center of ADC.
After 24 hours testing, the squared waveform will be adding an "DC offset" by the LMH6518 even cycling the power.
By the same testing method, it works normal(no dc offset) for High gain mode of LMH6518.
Obviously, the LMH6518 was damaged.
any suggestion? or workaround for this issue?