Re: [Discuss-gnuradio] About clock rate of USRP E100

[Alexander Chemeris]

Hi Matt,

Thank you for your clarification.

What are the limits and steps/accuracy of ADC/DAC clock speed regulation?
E.g. is it possible to sample at 56MHz or 26 MHz and set sampling
clock with 1Hz precision?

On Wed, Jan 12, 2011 at 00:16, Matt Ettus <address@hidden> wrote:
>
> As it is currently set up, there are only 2 clock rates.  The OMAP processor
> can run at up to 720 MHz.  This clock rate is independent of the FPGA, ADC,
> and DAC clocks.
>
> The ADC clock can run as high as 64 MS/s.  The DAC always runs at exactly
> double the rate of the ADC.  The FPGA is normally running at the same speed
> as the ADC, but you could conceivably run at 2x or 1.5x if you want to go
> faster, or a number of speeds if you want to go slower.
>
> We have not tried changing the FPGA/ADC/DAC clock during normal operation,
> but I don't think it would be worth the trouble to change it dynamically.
>
> Matt
>
>
> On 01/11/2011 12:38 PM, Miok Wah wrote:
>>
>> As far as I know, the decimation is after the ADC, so ADC rate doesn't
>> change
>> after changing the clock rate.  I'm happy to be corrected if it's not so.
>> :)
>>
>>
>>
>> Alexander Chemeris wrote:
>>>
>>> Hi,
>>>
>>> What about ADC/DAC clock rates?
>>>
>>>
>>> --
>>> Regards,
>>> Alexander Chemeris.
>>> http://www.fairwaves.ru
>>>
>>> _______________________________________________
>>> Discuss-gnuradio mailing list
>>> address@hidden
>>> http://lists.gnu.org/mailman/listinfo/discuss-gnuradio
>>>
>>>
>>
>
>
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-- 
Regards,
Alexander Chemeris.
http://www.fairwaves.ru