Texas Instruments ADC32RF-EVM Series User Manual page 17

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11. Enter "2000" in the box for Sample Clock rate in MHz.
12. Enter "1850" in the box for the Channel A DDC0 NCO1 frequency. The control value for NCO1 should
become 60621 as shown in
NOTE: These settings only apply with Fs = 2000 MHz. The NCOs in the ADC32RFxx are set to a
desired LO frequency by a numeric control that is a fraction of the sampling frequency. If the
sampling frequency changes, then the NCO frequency changes. In order to find the input
tone in the resulting FFT capture, the sampling frequency and the NCO frequency must be
known in order to know where the input tone should be located in the final FFT result.
SLAU620D – April 2016 – Revised August 2017
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Quick-Start Procedure for Digital DDC (Decimation Plus NCO) Mode in ADC32RF82
Figure 11. ADC32RFxx-EVM GUI DDC Configuration Tab
Figure 11
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ADC32RFxx-EVM