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Choosing a logic anaylser - will my expectations lead me to bankruptcy?

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egonotto:

--- Quote from: PA0PBZ on October 28, 2024, 02:41:57 pm ---
--- Quote from: NE666 on October 27, 2024, 10:02:59 am ---And if you don't require mixed signal, the Digital Discovery makes even more sense.

--- End quote ---

The digital discovery is only 5V, the analog one is -25 to +25

--- End quote ---

Hello,

no for the digital inputs of the Analog Discovery 2: “Input and output pins are LVCMOS3V3. Inputs are 5V tolerant. Overvoltage up to ±20V is supported.”

Best regards
egonotto

PA0PBZ:

--- Quote from: egonotto on October 28, 2024, 03:10:08 pm ---no for the digital inputs of the Analog Discovery 2: “Input and output pins are LVCMOS3V3. Inputs are 5V tolerant. Overvoltage up to ±20V is supported.”

--- End quote ---

You are correct, the spec -25/-25V on the front page is for the analog (scope) channels, even for the discovery 3.

iMo:
A simple resistor for the input protection is not enough for the +/-25V, imho.
Resistor should be large value (because the internal on-chip ESD clamping diodes are for 5mA max usually) and that will limit the BW/response.

The Analog Discovery 2 is using 220ohm PTC and additional 2 external DB3S406F fast 40V/75mA clamping diodes at its digi inputs.

PS: Some 15y back I was an early adopter of the Dangerous Prototypes first larger product - the Open Bench Logic Sniffer LA - still with almost alpha fw for the fpga and pic mcu and pc app at that time. Lot of fun with finetuning of the fw and pc app afterwards (I think we went from 50MHz sampling rate up to 200MHz !!).. $50 incl. shipping, I was using it a lot, well but today rather a toy..


--- Quote ---The advanced trigger offers many features found in an HP16500 / 16550 timing logic analyzer. It offers 16 sequence levels with two way branching (a programmable state machine), ten pattern value comparisons, two range checks, two edge checks, and two counter/timers.
--- End quote ---

fyi - http://dangerousprototypes.com/docs/Open_Bench_Logic_Sniffer   .. the page was last modified in Jan2015..  :D :D
Advanced HP16550 triggers:
http://dangerousprototypes.com/docs/Logic_Analyzer_core:_Introduction

Doctorandus_P:
I quite like my Kingst LA2016. On the box is written inputs can withstand from -50V to +50V and it works with Sigrok / Pulseview. Kingst also has support for Linux, so I could even use the original software, but I quite like Pulseview. You do need a pretty recent Pulseview version for the Kingst to work properly I now have: 0.5.0-git-9b8b734.

eTobey:
I have now looked at the Dslogic Plus. It looks like it has a nice trigger setup, where one could really get creative.  ;D
There is not a big community, and there was some license problems, but i have not read any bad things about it. The manual is very detailed, much more than the Kingst LA2016 for example. Its also about 40€ cheaper. The probes look good too.

The software is maintained.  :-+

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