Hi,
I am using AFE4404 EVM to sense a small flow signal. First, I want to have SNR estimation on the board.
But I found the noise floor is much bigger than expected. It seems there is signal of near 1Hz. It seems that
if I sample the ambient light using this EVM, the result has around 1Hz signal. But When I use thorlabs's sensor,
the around 1Hz signal disappeared. I wonder if there is an explaination of the signal? Is something in the chip
causing this?
Then I used eletrical Tape to isolate the ambient light and put the EVM in a black box. The result is list below.
When I use the EVM, and set the rf =2M cf =5pF, the noise code should be (12pA*2M/Vref)*2^22 ~83 code, right?
The noise is bigger and could you help me to reduce this?
I have followed the instrctions to unplug the ac power.
