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ADS8698: the ADC does not response

Part Number: ADS8698

hello

I'm using ads8698, and it does not return any value. I'm just trying to read a register, but the SDO pin is always low. First I send the standby command (0x8200), and then I read program register AUTO_SEQ_EN (default value is 0xFF), but it does not return anything. Is there any way to know that the ADC is in good condition? How do I read and write the adc correctly? If possible, please send me an example code of how to initialize the ADC (ytorress1@ucentral.edu.co).
I attach images of the oscilloscope of how I send the SPI frame.

thanks