I was able to configure my AD9172-FMC-EBZ properly, and am able to generate a test sine wave output. However, every once in a while after configuration completes, I see no output at all on both DAC channels. I have the TXEN0 and TXEN1 pins connected to the FPGA via slow slew LVCMOS18 pins. I have tried enabling TXEN via these pins after configuration as well as using the SPI register 0x0596 with value 0x0c to set TXEN via SPI (and ignore the TXEN0/1 pins). For the SPI method, I first page the MAIN_DAC page using a write to register 0x0008 of 0xc0. For both methods, I see that every once in a while the DAC outputs are absent after configuration. If I run the configuration again, they come back.
I saw the PA protection feature in the datasheet, but from what I could tell, after reset, all of the turn off features are disabled.
Any idea what could be causing this behavior?
Is the JESD link still up when no outputs?
Assumed answered offline. Let us know if there are further questions.