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sinara-hw / Kasli

Kasli is a powerful FPGA carrier, capable of controlling 12 Eurocard extension modules.
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LVDS DCXOs #49

Closed hartytp closed 4 years ago

hartytp commented 4 years ago

@marmeladapk AFICT the LVDS Si549 currently has good availability, while the CMOS ones are hard to find. Shall we switch to the LVDS parts (needs RC changes as well)?

marmeladapk commented 4 years ago

I made a second variant with LVDS Si549: obraz This the only LVDS Si549 that I found to be available. I also DNPed helper termination in this variant near FPGA.

For reference my search terms on octopart:

hartytp commented 4 years ago

@WeiDaZhang can you look at this and sign off asap please? (Check terminations, coupling, voltage levels, part numbers, component availability, etc).

hartytp commented 4 years ago

@marmeladapk were any changes required for the coupling of the helper PLL to the FPGA?

hartytp commented 4 years ago

other than that, LGTM

marmeladapk commented 4 years ago

@hartytp I don't think so, at FPGA we'll use LVDS receiver with termination and Si549 has standard common mode output voltage level.

hartytp commented 4 years ago

cool

WeiDaZhang commented 4 years ago

@hartytp They all look right.

hartytp commented 4 years ago

Cool.

hartytp commented 4 years ago

@marmeladapk for LVDS DCXO, don't you need to DNP R225 (the termination on the helper DCXO at the FPGA)?

marmeladapk commented 4 years ago

@hartytp It is DNPed.

hartytp commented 4 years ago

Aah, okay, great!