Hi !
ADS1248 does not give the willingness nor the DRDY, or DOUT / DRDY to the followingconditions.
1. Pin 1 - DVDD = 3.3V.
2. Pin 2 - DGND = 0.
3. Pin 3 - CLK = 0.
4. Pin 4 - RESET = 1.
5. Pin 22 - AVDD = 5V.
6. Pin 23 - START = 1.
7. Pin 24 - CS = 0.
8. Pin 28 - SCLK = 0.
The SPI adjustment is made.