I am trying to test the AD7608 device with a simple setup. I had my SPI signals correct on the pins.
The setup is as below:
OS0, RANGE, RESET = logic low
OS1, OS2, SER_SEL, /STBY, REF_SEL = logic high
decouple caps on supply and ref pins
But I did not get the data on DoutA.
1) /CS, 2) CONVSTA and CONVSTB 3) FRSTDATA pin 4)SCLK
1) /CS, 2) CONVSTA and CONVSTB 3) BUSY pin 4)SCLK
These two screen captures were took from the device, showing the SPI and CONVST signals were fine. But my readouts were all FFs the DO stayed high during the 18 bytes readout.
Any comments and help are greatly appreciated.