PLA2216 Logic Analyser Probes for Rigol DHO900 and MSO5000 Oscilloscopes
The original PLA2216 from Rigol is expensive. People made their own and opensourced the design.
The early teardown and DIY is here: September 28, 2019, 07:23:29 am from https://www.eevblog.com/forum/testgear/rpl1116-active-logic-probe-pod-for-1000z-series-teardown/200/
This guy is creative.
Okay. Words in short.
Other opensource LA probe projects
MSO5000 logic analyzer probe
It uses 1x SN74AXC8T245 and 1x SN74LXC8T245
https://github.com/festlv/mso5000-logic-probe
Low cost logic analyzer probe for Rigol MSO5000
https://oshwlab.com/f33net/digital-probe-rigol-mso5000
The author said this LA solution can reach upto 160MHz for meaturing 3.3/5.0V input levels. Chip on board: SNV65LVDS
Cheap Clone of Rigol PLA2216 Logic Analyser
https://climbers.net/sbc/clone-pla2216-logic-probe-analyzer/
The current version is v3.1 which supports SN65LVDS391D or SN65LVDS391PWR. It depends on where you can buy.
FYI. The 3D-printing case https://www.printables.com/model/622605-rigol-logic-analyzer-probe-case
Logic Analyser Probe
This design uses SN65LVDS391D which can handle 3.3V/5V TTL levels. For signals with higher voltages, voltage dividers could be connected in front.
LaPOD project
LaPOD is a project to create a logic analyzer probe for the various Rigol oscilloscopes that feature the logic analyzer connector. Not all scopes have the connector exposed and not all scopes have the components needed on the PCB. But for those that do, the LaPOD could be a cheap alternative to get those probes.
You can find my mirror from here: https://github.com/xros/lapod or get the original from here https://gitlab.com/riglol/lapod
PodHub (HDMI-mini ports)
1 pod: LaPod LMH7322 pod (HDMI-mini)
You can make multiple pods, let's say 4 pods for 16 channels.
Concept diagram
written by me for better understanding
Basic
Oscilloscope <-> PodHub <-> Pods
The design from LaPod project is very flexible. https://riglol.gitlab.io/lapod/ . On the hub, you can use HDMI or mini-HDMI cable with pods. Rigol PLA2216 uses 8*LMH7322 chips for 16 channels (1chip for 2 channels). For lowering budget, 4*LMH7324 chips can be used for 16 channels (1 chip for 4 channels). LMH7322 and LMH7324 are almost the same but different from some aspects. Please read their docs to know more.
LaPod project gives us 3 approaches to reach the goal (1 pod):
1) 2*LMH7322 same as the Rigol PLA2216 (40V tolerance)
2) 1*LMH7324 for cheaper budget (40V tolerance)
3) 1*SNV65LVDS for lower budget with limited range (5V tolerance and you can't set triggering voltage manually in the LA menu but VERY CHEAP)
The current discussion of this project on EEVBlog is here: https://www.eevblog.com/forum/testgear/another-low-cost-la-probe-for-rigol-mso5000-by-oliv3r/
More discussion about MSO 5000 oscilloscope can be found here: https://www.eevblog.com/forum/testgear/rigol-mso5000-threadlist (DHO900 also share some common designs as MSO5000 so this thread can be helpful)
Personally I prefer this project. The design is very flexible and probably future-proofing.
Extra
The x-ray photo of Rigol PLA2216 Logic Analyser Probe
Source is from: https://www.eevblog.com/forum/testgear/hacking-the-rigol-mso5000-series-oscilloscopes/msg2055715/#msg2055715
You can DIY based on the PCB and BOM charts. Or just buy a cloned one or original one.
Happy hacking
