Hello,
We are using the circuit below to isolate an analog signal, but at the differential output we get a constant low-frequency ripple of around 40mVrms.
We have several prototype boards, and this ripple is not consistent among all the boards. It changes in amplitude and frequency, and in some boards it's not even there.
From board to board, the amplitude changes between 0 and 50mVrms, and the frequency between 300Hz and 3kHz. In each board the ripple remains unchanged, even if we short the input pins.
Can one of the analog stages be oscillating?
Thanks,
Max
