In the document titled EVALUATING THE AD9680/AD9234 ANALOG-TO-DIGITAL CONVERTER , item 7 of 'Configuring the board' gives an equation for the REFCLK. What should the values for M and L be?
For more information on L and M, please refer to the "JESD204B OVERVIEW" section in the AD9680 datasheet and table 26 on page 72.
there is some more information in the RAQ here : Presto! Double Your Number of ADC Channels | Analog Devices
Thank for your reply, I will look at the ‘JESD204B OVERVIEW’ as you suggest.
However I have another question regarding testing the AD9680 with the ADS7-V2 and VisualAnalog analyser software….
Is it possible to save the raw ADC data on the host PC for offline analysis with (e.g.) Matlab?
If so, what is the maximum block size that can be captured and saved to PC file (i.e. can the entire DDR3 buffer be saved to file)?
And what file format would it be saved in by VisualAnalog (I’ve seen mention of .csv file but this would be very slow for large amounts of data)?
please take a look at the following thread(s)
HSC-ADC-EVALEZ+AD9656 Matlab control
Thanks for the links Umesh. Hopefully I will be able to get the data transfer working when I get the Evaluation and capture boards, which are different to the ones used in the links.
If you have any questions during your evaluation please let me know. I will try to help as much as i can.
I’m now thinking to go for the AD9695 as it has more decimation stages and lower power.
Could you explain the purpose of the programmable FIR block in front of the DDC? I read somewhere that it’s for quadratic error correction and equalisation. Does this just apply to complex inputs such as when RF quadrature demodulation is employed prior to the ADC? Any links to explanations/applications would be appreciated.
the programmable FIR filter is only needed if you are needing to equalize, or correct for quadrature errors as you have mentioned. The datasheet for AD9695 explains the supported modes for the programmable FIR.
Is there a certain application or mode you would like to implement?
Thanks again Umesh,
I’ve found some references on QEC now.
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