I have test ADL5304 with PIN(PD), My PD is about 100nA in the room. I cover it up, PD is about 1nA.
ADL5304 is normal at PD 100nA, but it is normal at 1nA, Please give me some idea.
Follow is normal picture at 100nA , it is about 1.5V.
Follow is abnormal pitcture at 1nA.
Follow is ADL5304 Circuit diagram。