Is start conversion and chip select the same? (ADCeh8b1)
Reading the datasheet, I see an important thing - this chip is not SPI! For one thing, the clock is an output from the chip, not an input. You might be able to make it work if you can configure your micro as an SPI slave device but it cannot work if the micro is master.

If you do run as slave, it would work as follows:


You need a GPIO to pulse Start Convert to start the communications.
EOC connects to the micro’s CS. However, this is positive logic where SPI CS is normally negative logic.
The Clock connects to your clock input.
The Serial Output would connect to MISO
MOSI is unconnected.


I really suggest you find a different ADC that interfaces as a proper SPI slave.