Hello guys.
I'm quite demoralized.
I'm trying to build something like a source-meter for my thesis work. Everything seems to work, except for the LTC2402. Seriously, it's driving me crazy.
I tied the LTC2402 to a Nucleo-F767ZI according to these schematics:

i.e. CS to PE6, SCK to PG11 and SDO to PA6. I also setted the SPI configuration as follows:

So, according to the LTC2402's datasheet, when CS goes low, SDO goes low too if the conversion is finished, otherwise it stays high. When CS goes high, SDO goes to Hi-Z.
But, anything i do, i can't pull data from the LTC2402. SDO seems to stay in an unknown Hi-Z state, even if CS is low.
I tried to pull-down SDO and SCK to DGND, but nothing changed.
Here the signals at the oscilloscope. CH1 and CH2 represents SDO and SCK. I inverted CH1 and CH2 in a picture. Sometimes i get a "smaller" replica of SCK signal on SDO, sometimes something that seems a GND on SDO, sometimes a very noisy replica of SCK signal on SDO. I handsoldered it to a pcb, so maybe the solder job is not the best, but there is continuity in all signals, even touching the package leads.

Please, can you help me?