We use the Ad8331 at a frequency range of 20 kHz to 25 MHz. At the Output of the LNA we have a distortion of the sinus Signal at amplitudes higher then 1.25 Vpp (at each Pin LON and LOP) at the frequencies between 40 kHz and 80 kHz. Below 40 kHz and above 80 kHz there are amplitudes up to 2.25 Vpp possible, which is conform with the datasheet. The used coupling capacitors between LNA and attenuator input have a value of 100 nF.
Is there anybody, who have an idea what happend?