I have a question for AD9643 initialization issue.
When I power on the AD9643 and it will load the default value as Table 14?
It means I don't use the SPI to initailize the AD9643 first time and it could be worked as well?
Glad to hear that you have been able to capture data. There are other ADCs on the market that may require initialization, but the AD9643 does not require this (unless different settings from the defaults are required). The default registers values are stored internally and loaded upon device startup.
The default values in the AD9643 should be a sufficient startup condition for the device. Can you elaborate on your test conditions? Are you using the AD9643 evaluation board or are you using the AD9643 in your system design?
Thank you for your response.
I used to AD9643 EVB and conenct to ZC702 or ZC706.
I found no SPI wire connection to both borad (Xilinx and AS9643) but ADC seems could be worked as well.
PS: The AD9643 clock came from FPGA not use on board clock source.
I am assuming you are using an FMC interposer board with the AD9643 evaluation board to connect to the Xilinx boards. The SPI connectors should route through the interposer board, but your FPGA needs to be configured for the right pins. If you use the on board clock source from the development board, depending on the phase noise, you may see performance degradation. We recommend using a low phase noise clock source such as a Rohde-Schwarz SMA100 if available or a Wenzel low phase noise oscillator.
Were you able to successfully power up the device and capture data?
Yes, We used to low noise signal gerator to be a clock source.
BTW, We successfully to capture the data after power up and wihtout any initiallizaion procedure thru SPI that is because I don't know that is right or not?
In my past experiments , the ADC need to have initial procedure but AD9643 can't and just seems load default value from table.14 after power on and could be worked as well.
AD9643 hasn't EEROM to store the default value and how does it load default value and my experimental result is correct ?
Great, thank you for your help !
Retrieving data ...