Other Parts Discussed in Thread: AFE7900
Tool/software:
Hi TI,
I am attempting to check the performance of the 4 RX channels on the AFE7900 EVM in real mode and I am getting either no signal/just noise or significantly attenuated input with the wrong frequencies on AFE CGui_CGui_Custom_GUI FFT output.
I am using 320 MHz input that is +1.5 dBm into the board input - confirmed on spectrum analyzer. This input is recognized by CHC but the min/max of the codes on Tab A are only around +/- 1100. The FFT plot shows that the Fin is at 700 MHz and at -28 dBFS, even though I have DDC bypassed. The DSA is set to zero. Are there any other settings that need to be checked? We brought it up in default mode.
For CH A, B, D - I am getting basically noise out of them. The codes are +/- 30 or 40 at most, and I see no change between RF ON and RF OFF. Is it safe to assume that these are broken? Are there other enabling settings to check - the GUI indicates they are all enabled. The current draw from the 5.5V supply for the AFE is almost 3A.
Thanks,
Christina
