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| Low cost logic analyzer probe for Rigol MSO5000 EasyEDA project |
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| suarezvictor:
I think a faster way to couple digital signals is by a XOR gate used as a inverting buffer and another as non-inverting buffer, followed by a resistor networks that adapts levels I designed such a resistor network for signals of 3V (3.3V is similar or also the same circuit will work) Common mode voltage is 1.25V and expected termination 100ohm, for 3.5-4mA (see simulation) XOR gate can be a fast SN74AUC1G86DCKR (1ns propagation delay) |
| suarezvictor:
I was able to detect 1ns pulses (see red trace) by direct connection to LVDS inputs. So that timing can be reached in a probe board using differential inputs buffered by a faster buffer, like SN65LVDS100 (up to 2gbps) Note that same IC can be used for a CMOS to LVDS translator, the one without a termination resistor is much like an analog comparator with a bit of hysteresis (capable of 0 to 4V inputs) |
| andy_edin:
Hi, This looks great - and a much better option that the Rigol probe for my limited needs. I have the DS1104Z Plus scope with the the 68 pin HPDB LA connector. Has anyone tried this design (or the budget MSO5000 probe https://www.eevblog.com/forum/testgear/ms05000-budget-logic-analyzer-probe-set-design/?all) on this scope ? Maybe there is even a PCB with a HPDB plug instead of the 40pin IDC for the MSO5000 available somewhere ? |
| Andrey_Ak:
Good afternoon! Please tell me, did you say to take these drivers SN65LVDS1DBVRG4 https://www.lcsc.com/product-detail/LVDS-ICs_Texas-Instruments-SN65LVDS1DBVRG4_C50990.html But these won't fit by any chance? SN65LVDS1DBVR https://www.lcsc.com/product-detail/LVDS-ICs_Texas-Instruments-SN65LVDS1DBVR_C465731.html ?? |
| Nikki Smith:
--- Quote from: andy_edin on August 27, 2023, 04:21:55 am ---Hi, This looks great - and a much better option that the Rigol probe for my limited needs. I have the DS1104Z Plus scope with the the 68 pin HPDB LA connector. Has anyone tried this design (or the budget MSO5000 probe https://www.eevblog.com/forum/testgear/ms05000-budget-logic-analyzer-probe-set-design/?all) on this scope ? Maybe there is even a PCB with a HPDB plug instead of the 40pin IDC for the MSO5000 available somewhere ? --- End quote --- I've designed an improved (and cheaper) version of the board in KiCad for the MSO5000 (and new DHO900) series. I'd also like to do a version for the DS1000Z Plus series with that 68-pin connector, but I don't have that scope to test it with. Would you be interested in trying an alpha-test board Andy? Thanks https://climbers.net/sbc/clone-pla2216-logic-probe-analyzer/ |
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