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The NCO only mode can be configured through the GUI by following steps.
1. Launch the DAC39RF10EVM GUI.
2. Select the LMX->DACCLK | LMX/LMK->FPGA as the clock source.
3. Enter Clk Freq 10240 MHz.
4. Select JMODE3 for JMODE option.
5. Select 8 for Interpolation
6. Select 8 for number of streams
7. Click the button Program Devices.
8. On the NCO tab uncheck the DP Enable
9. Uncheck the JESD Enable
10. For SPIDAC I enter the value of 32767 for full scale output power.
11. Check the NCO Enable
12. Select the correct DUC routing( DUC0 and DUC1 routed to DAC0 and DUC2 and DUC3 routed to DAC1).
Since two DUC are routed to single DAC The gain value should be adjusted to -6dB to prevent the DAC from
saturating.
13. Enter the desired frequency
14. Check the DP Enable.
15. The DAC should have ouputs on both channels.
SBAU395 – APRIL 2023
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Figure 3-5. NCO only JMODE settings for GUI.
Copyright © 2023 Texas Instruments Incorporated
Setup Procedure
DAC39RF10EVM Evaluation Module
11
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