Hi, we are debugging our board, which implements 4 serial inputs (limited to 270Mbps ASI streams) through LMH0394+LMH0366 ICs.
Unfortunately, when the four channels are receiving active signals, the LMH0366 of channel #2 and #3 lose lock, quite often.
After checking similar threads in this forum, the problem seems related to multiple LMH0366 interfering each other.
In our design, this is very probably due to SPI chaining of the four LMH0366. In particular, MISO/MOSI lines are "floating" with only a weak pullup on MOSI input.
I managed to solve the problem pulling up the MISO-MOSI sections with 4K7 and filtering it with a 100pF to GND.
The problem is, I have no idea if this solution is reliable enough to go into mass porduction.
I'm sharing this experience in order to help other people running in the same issues. Any feedback is welcome.
