I have a question about how to connect zybo z7 to a ADC with LVDS input and output running at 200MHz. The zybo z7 need to provide clock to the ADC at 200 MHz and receive data at this speed. The ADC's interface is indeed LVDS yet this zybo z7 board's IO bank are all 3.3V powered, which means that it cannot use the internal termination. I think I have two way to make it work.
1. transmit data and clock in a single-ended way and do the single-ended to differential conversion on my ADC board.
2. transmit data in LVCMOS33 and do level conversion in ADC board.
The problems I have are that:
1. Is that ok to transmit a signal in single-ended way at 200MHz? I have no experience on doing that before.
2. If I use LVCMOS33, since I still cannot use the on chip termination, is that enough for me to just terminate transmission lines at the ADC's LVDS driver side?
3. What is the impedance on the FPGA IO pins when it is in LVCMOS mode?
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GN_ghost
I have a question about how to connect zybo z7 to a ADC with LVDS input and output running at 200MHz. The zybo z7 need to provide clock to the ADC at 200 MHz and receive data at this speed. The ADC's interface is indeed LVDS yet this zybo z7 board's IO bank are all 3.3V powered, which means that it cannot use the internal termination. I think I have two way to make it work.
1. transmit data and clock in a single-ended way and do the single-ended to differential conversion on my ADC board.
2. transmit data in LVCMOS33 and do level conversion in ADC board.
The problems I have are that:
1. Is that ok to transmit a signal in single-ended way at 200MHz? I have no experience on doing that before.
2. If I use LVCMOS33, since I still cannot use the on chip termination, is that enough for me to just terminate transmission lines at the ADC's LVDS driver side?
3. What is the impedance on the FPGA IO pins when it is in LVCMOS mode?
Thanks a lot!
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