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

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joeyjoejoe:
I think the biggest opportunity missed here is the ability to design a simple low cost 4-8 channel version.

dren.dk:
I have just assembled the first set of pods and breakout board: https://photos.app.goo.gl/qMiUNHk9Tk6krjD9A

Holy hell, those 250 parts by hand at 0603 was hard without going insane.

I ended up sticking 48 0402 10 nF caps on the back, so each of the 12 power pins per IC has a super-local decoupling cap.

I still want to play around with a cheaper and lower performance frontend.

MegaVolt:
Input band at the probe 200 MHz. Perhaps changing the input chains can raise this band to 500? Sampling frequency allows.

felix ch:

--- Quote from: dren.dk on March 13, 2019, 04:47:06 pm ---I have just assembled the first set of pods and breakout board: https://photos.app.goo.gl/qMiUNHk9Tk6krjD9A


--- End quote ---
:clap:
Does it work as you expected?
If so, I'll going to make it.

Thanks for you a lot!

dren.dk:
Not quite.

Good news first:
* I have verified all the output voltages on the breakout board without the pod, so that's nice.
* I have also verified the connections from the breakout to the pod and that there are no shorts.

Then the bad news:
* I fucked up the charlieplexing for two of the LEDs, so that will require either a new board or some bluewires.
* I'm seeing -2.5V on Vref when the pod is plugged into the scope, which should not happen as nothing but high-impedance inputs are connected to Vref and no shorts to any power rail.

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