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Sampling rate vs. max USB rate

Posted: Mon Sep 09, 2019 8:30 pm
by harry4516
I have a question regarding the sampling rate.
The SDRplay is specified with max 10 MS/s. With 14 bit for each sample and twice of that for I and Q.
This is a data rate of 10 * 14 * 2 = 280 Mbit/s

But the USB 2.0 interface can only transfer 40 Mbit/s maximum.

That looks strange, what is the mistake in my calculation ?

Thanks, Harry

Re: Sampling rate vs. max USB rate

Posted: Tue Sep 10, 2019 7:30 am
by g1hbe
I'm no expert in matters digital, but I think at 10 Ms/s, the samples are reduced to 8 bit. I could be wrong (I often am...).

Re: Sampling rate vs. max USB rate

Posted: Tue Sep 10, 2019 10:06 am
by OH2BUA
harry4516 wrote:
Mon Sep 09, 2019 8:30 pm
But the USB 2.0 interface can only transfer 40 Mbit/s maximum.
40 megabytes, not megabits.