Setting NI5641R ADC/DAC IQ rate

[tommpogg]

Hi,

I am using a NI5641R board and I am programming it using the LabVIEW FPGA Module.

How can I set the IQ rate of the ADCs and of the DACs?

I am looking into the library that comes with the board but I cannot find any VI (or combination of VIs) to set the IQ rates.

Thank you

[tommpogg]

Probably, I have found the solution.

I post it for those who are interested. Of course, comments are welcome.

IQ rate at the output of the ADC (downconversion):
- use "ni5640R ADC Configure NCO.vi" VI to configure the sampling frequency (e.g. sample frequency= 100 MHz);
- use "ni5640R ADC Configure DDC.vi" VI to configure the decimation (e.g. decimation=4);
- than, the resulting IQ rate is: sampling frequency/decimation (e.g. 100/4=25).

IQ rate at the input of the DAC (upconversion):
- use "ni5640R DAC Configure for Quadrature Mode.vi" VI to configure the CIC Interpolation Factor (remember that there is an addictional fixed interpolation factor of 4);
- than, the resulting IQ rate is:: 200M/(4*CIC Interpolation Factor).