i have a question about application note AN-812. I used the circuit in this application note to change the AD9272's SPI registers. but it doesn't work. i have some thoughts:
1. whether the AD9272 SPI voltage level is 1.8v , my design is on the base of 1.8v. the problem may be that voltage level don't match.
2.problems about registers . the register address 0xFF , Whether every time I change other registers, i must change the address 0xFF from 0x00 to 0x01.
There may be other reasons that you can tell me. I want to know the reason. Thank you very much ！