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Max The Magnificent
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Per-Channel or Total Capacity
Max The Magnificent   4/7/2014 2:37:32 PM
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Hi Adam -- in this column you say "The performance of the devices has also been expanded at the top end.  The previous Logic and Logic16 devices had a max digital sampling rate of 24MS/s and 100MS/s respectively.  The newest devices max out at 500MS/s.  On the analog side of the equation, the max sampling rate that can be had is 50MS/s.  This equates out to about 5MHz of bandwidth at the -3dB point."

Are these numbers per channel, or the total capacity of the device for all channels?

joegarrison
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Re: Per-Channel or Total Capacity
joegarrison   4/7/2014 3:04:01 PM
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Hi Clive -- these numbers are per-channel.

The performance numbers do go down once the data rate exceeds the USB pipe bandwidth -- i.e. when you add more channels than can be supported simultaneously.

We put together an interactive configuration tool so you see what to expect for a given application:  https://www.saleae.com/#interactive-tile

 

Max The Magnificent
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Re: Per-Channel or Total Capacity
Max The Magnificent   4/7/2014 3:07:18 PM
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@joegarrison: Hi Clive -- these numbers are per-channel.

Wonderful -- thansk for getting back to me so quickly -- this really does look like a very useful addition to one's test setup.

MeasurementBlues
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Compared to what?
MeasurementBlues   4/7/2014 4:00:11 PM
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Adam,

Interesting device. Which devices will you compare against this one?

MeasurementBlues
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Dual use
MeasurementBlues   4/7/2014 4:03:35 PM
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Can you program each channel invidually for analog or digital inputs?

MeasurementBlues
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Price?
MeasurementBlues   4/7/2014 4:04:32 PM
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Do you have pricing on these devices?

MeasurementBlues
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Aeroengineer
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Re: Per-Channel or Total Capacity
Aeroengineer   4/7/2014 4:33:00 PM
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Joe,

Thanks for chiming in, and welcome to EETimes.  I am surprised that you are back on your feet.  It sounds like you guys had a late night last night.

Aeroengineer
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Re: Compared to what?
Aeroengineer   4/7/2014 4:34:12 PM
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I personally have the Openbench Logic Sniffer from Dangerous Prototypes.  I was also going to do a comparison based upon what I can find on the web at these price points.  These would be more of a paper comparison.

Aeroengineer
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Re: Dual use
Aeroengineer   4/7/2014 4:35:53 PM
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According to what has been told to me and what their device simulator has on their webpage, you can have each channel taking both analog and digital or set to either or.  Each channel can be configured individually.

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As data rates begin to move beyond 25 Gbps channels, new problems arise. Getting to 50 Gbps channels might not be possible with the traditional NRZ (2-level) signaling. PAM4 lets data rates double with only a small increase in channel bandwidth by sending two bits per symbol. But, it brings new measurement and analysis problems. Signal integrity sage Ransom Stephens will explain how PAM4 differs from NRZ and what to expect in design, measurement, and signal analysis.

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