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RPL1116 (MSO1000Z) and PLA2216 (MSO5000) Active Logic Probe teardown

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Noy:
Yes i want to use the Kicad Design.
Which differential signals have to be swapped? Is there a list with the wrong ones?

I know about the embedded resistance. I bought a second set of cables and will replace them  with zero ohm resistors.

memeruiz:
Great thread!

Awesome contributions from dren.dk and later from thmjpr and whowe, thanks guys!

I have seen the gitlab repo from dren.dk, but not the one with the USB-C modifications. Is it somewhere? Would be nice. Maybe I can make some contributions to that version.

Thank you!

thmjpr:

--- Quote from: Noy on February 05, 2020, 07:18:30 am ---Yes i want to use the Kicad Design.
Which differential signals have to be swapped? Is there a list with the wrong ones?

I know about the embedded resistance. I bought a second set of cables and will replace them  with zero ohm resistors.

--- End quote ---

You'd have to compare the connector pinout to what is shown in Rev 2 schematic. I was told the pinout is correct by users above, but I have not personally tried that board.


--- Quote from: memeruiz on February 07, 2020, 04:07:57 pm ---Great thread!

Awesome contributions from dren.dk and later from thmjpr and whowe, thanks guys!

I have seen the gitlab repo from dren.dk, but not the one with the USB-C modifications. Is it somewhere? Would be nice. Maybe I can make some contributions to that version.

Thank you!

--- End quote ---

thank you, https://gitlab.com/thmjpr/stm32f03_la_monitor

If you need any specific info/files let me know via PM.

Rerouter:
If it was my version, looking way back at my last upload, I did have pins flipped, and looks like I never uploaded after fixing it, so here they are minus the last few connections I got stuck on.

If the other, If you can point me to what is wrong, I should be able to correct them,

Gandalf_Sr:
I've been looking at this thread with interest; I'm close to ordering an MSO5074 but I'm not keen on paying an extra $360 for the PLA2216 cable (36% of the cost of the scope).  I looked on Digikey and there are other LVDS comparators available although many seem nearly as expensive as the TI part suggested.  The difference in price between the MSO5074 without/with the PLA2216 is $360 and you can buy the probe on its own for $400 so I may well just buy without for now.

So I'm considering a poor man's logic probe that would be good for up to 100 MHz ish, I realize low propagation delay may be a necessity for digital timing alongside the analog signals but some logic families such as TI's AUC go down to 1.5 nS propagation delay although I think that the MSO5000 needs +/- LVDS signals.

Then I looked on TIs website and came up with the DS90LV047A 4-channel LVDS driver IC which are $2.62 each so about $11 to get 16 channels, and have a 1.7 nS propagation delay, that's more like it!

Anyone think this could work?  Tell me I'm insane but, if this is a reasonable idea, let's get the circuit designed! I will create the schematic do the PCB layout in Diptrace.

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