Read data is 0XF4,0X53,0XFE, how to parse?
Looking at the timing diagram of Figure 3a, I think there could be something wrong with your communication with the ADC. The first two bits should always be zeros. Can you provide an oscilloscope photo showing CSL, SCK, SDI and SDO? A schematic of your circuit would also be helpful.
The first two bits should always be zeros，why？
If you look at the timing diagram of Figure 3a you will see that the first two data bits clocked out of SDO (bits 18 and 17) are always zero.