hallovipin
Member level 1
Friends,
I am using SPARTAN3A Fpga kit. I have made a dual layer Digitizer PCB which has AD9224 on board with preamplifier for analog signal and differential driver for ADC. Since I only have one ground plane on the PCB , I treat this is as Analog ground plane. I have connected both AGND and DGND pins to the same ground plane, as specified in the datasheet.
Now I want to feed clock to this PCB from FPGA kit and want to take digital data to the FPGA kit. As I have to somewhere connect both the grounds of KIT and my PCB , I fear that digital noise of KIT will couple to the quite analog ground of my PCB. What do I do to tackle this. I went through some literature which says that instead of feeding clock directly I should use a differential receiver, but my hardware is frozen now...what should I do plz help
I am using SPARTAN3A Fpga kit. I have made a dual layer Digitizer PCB which has AD9224 on board with preamplifier for analog signal and differential driver for ADC. Since I only have one ground plane on the PCB , I treat this is as Analog ground plane. I have connected both AGND and DGND pins to the same ground plane, as specified in the datasheet.
Now I want to feed clock to this PCB from FPGA kit and want to take digital data to the FPGA kit. As I have to somewhere connect both the grounds of KIT and my PCB , I fear that digital noise of KIT will couple to the quite analog ground of my PCB. What do I do to tackle this. I went through some literature which says that instead of feeding clock directly I should use a differential receiver, but my hardware is frozen now...what should I do plz help