Author Topic: Logic Analyzer recommendations?  (Read 1137 times)

TomWS

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Logic Analyzer recommendations?
« on: March 11, 2019, 12:41:08 PM »
I recently tried a Digilent Digital Discovery and, while it worked in some cases, I found that it loaded signals sufficiently to make a working circuit non-working and, just recently, the SPI protocol trigger stopped working even though I can see the data pattern I was trying to trigger on if I used simple clock/signal triggering.

Anyway, enough of my problems, I am looking for a decent logic analyzer.  I don't need many channels (8 should be sufficient), but I do need reasonable bandwidth (100MHz would be nice but at least 200MHz sampling) and I have to have protocol triggering and parsing (SPI, I2C, UART, and OneWire would be nice).  Cost?  Preferably $200 or less, but if there's an overwhelming function/quality advantage I could go higher.

Anyone have an analyzer they like?

Felix

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Re: Logic Analyzer recommendations?
« Reply #1 on: March 11, 2019, 12:56:05 PM »
I have an old saleae 24mhz tops, 8 channel. It worked every time I used it. So ... based on that I can recommend that brand. But they are like an apple product, expensive and polished, they have a PC app that is nice and I don't recall it crashing on me.

If you want the non apple version of that, get a Bus Pirate, $30 and reviews available here. I would try this first if it was me buying a logic analyzer the first time.

100mhz? 200mhz? Really? For what?

TomWS

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Re: Logic Analyzer recommendations?
« Reply #2 on: March 11, 2019, 02:43:03 PM »
I have an old saleae 24mhz tops, 8 channel. It worked every time I used it. So ... based on that I can recommend that brand. But they are like an apple product, expensive and polished, they have a PC app that is nice and I don't recall it crashing on me.
Good recommendation if ever I heard one - especially not crashing  ;)
I discovered that Saleae has discounts for us old folk who like to hack around...  So... I have an Logic Pro 8 on its way.

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If you want the non apple version of that, get a Bus Pirate, $30 and reviews available here. I would try this first if it was me buying a logic analyzer the first time.
No thanks.  I'm tired of trying to get junk to work for me.
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100mhz? 200mhz? Really? For what?
For all these newfangled processors that are coming down the pike.  200MHz sampling only gets me 10nS resolution.  The Logic Pro can go up to 500MHz sampling on up to 4 channels and can still do analog sampling on one more channel.  It's also USB 3 so hopefully no PC bottlenecks!