I am using AD9520-0 clkgen, I am trying to communicate it using SPI.
I have made the following configuration:
- I have kept SP0 and SP1 of AD9520 high.
- I have kept the pins REF_SEL,RESET,SYNC,PD high and EEPROM low.
I am not able to read any of the registers from it.
I am writing a value 0x8003 to read back the PART-ID.
Steps followed are as below;
- Keep all the SPI lines pulled high.
- Pull CS to low.
- Write first byte(0x80)
- Write address(0x04)
- Write 0.(to read back )
- Set CS high.
I have attached the schematics followed. I have connected 24MHz oscillator to REFIN and REFINB. But when i probe at those points i didnt see any frequency at all.
Please tell me if any other procedure need to be followed to initialize it.
Prakash B J