SBAU395 april   2023 DAC39RF10

 

  1.   Introduction
  2. 1Trademarks
  3. 2Required Equipment
  4. 3Setup Procedure
    1. 3.1  Installing the High Speed Data Converter (HSDC) Pro Software
    2. 3.2  Installing the DAC39RF10EVM Configuration GUI Software
    3. 3.3  Connect the DAC39RF10EVM and TSW14J59EVM
    4. 3.4  Connect the Power Supplies to the Boards (Power Off)
    5. 3.5  Connect the Spectrum Analyzer to the EVM
    6. 3.6  Turn On the TSW14J59EVM Power and Connect to the PC
    7. 3.7  Turn On the DAC39RF10EVM Power Supplies and Connect to the PC
    8. 3.8  Turn On the Signal Generator RF Outputs
    9. 3.9  Launch the DAC39RF10EVM GUI and Program the DAC EVM
    10. 3.10 Programming the NCO
      1. 3.10.1 SPIDAC( NCO only) Operation
    11. 3.11 Launch the HSDCpro Software and Load the FPGA Image to the TSW14J59EVM
  5. 4Device Configuration
    1. 4.1 Supported JESD204C Device Features
    2. 4.2 Tab Organization
    3. 4.3 Register Map and Console Control
  6. 5Troubleshooting the DAC39RF10EVM
  7. 6References
    1. 6.1 Technical Reference Documents
    2. 6.2 TSW14J59EVM Operation
  8. 7Appendix
    1. 7.1 Customizing the EVM for Optional Clocking Support
      1. 7.1.1 LMX->DACCLK | LMX/LMK-> FPGA option (Default)
      2. 7.1.2 EXT->DACCLK | LMX/LMK-> FPGA Clocking Option
      3. 7.1.3 EXT->DACCLK | LMK-> FPGA Clocking Option
    2. 7.2 Signal Routing
    3. 7.3 Analog Outputs
    4. 7.4 Jumpers and LEDs

3.10.1 SPIDAC( NCO only) Operation

The DAC can also be configured in SPIDAC Operation (NCO only mode). In NCO only mode, data streamed from JESD is ignored and DUCs inputs are driven by SPIDAC I and SPIDAC Q. This mode can be enabled when JESD Enable is set to 0, interpolaton factor is greater than or equal to 2 and DP Enable is set to 1, the DAC is configured in NCO only mode. Following Table 3-2 , the correct combination of number of streams and interpolation factor should be selected to enable the desired number of DUCs and setting the desired outputs from respective DACs.

In the Example, all the four DUCs are enabled. DUC0 and DUC1 are routed to DAC0 and DUC2 and DUC3 are routed to DAC1. If more than one DUC is routed per DAC, the DUC data into the DAC must be attenuated to prevent the DAC from saturating.

The NCO only mode can be configured through the GUI by following steps.

GUID-20230422-SS0I-VHVK-M3XN-JRWHCKNQ5PBJ-low.svg Figure 3-5 NCO only JMODE settings for GUI.
  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.
GUID-20230422-SS0I-Q8JQ-GZR3-PVVFNDNFHBL9-low.svg Figure 3-6 NCO only mode GUI settings

Similar to SPI DAC mode, the DDS mode can be used as a lower power option. To enable DDS mode, the following steps are used.

  1. Follow steps 1-9.
  2. Skip step 10.
  3. For 11 step select DDS Enable.
  4. Follow step 12 according to requirements.
  5. Follow step 13.
  6. For Amplitude( Two DUCs routed to single DAC, amplitude reduced by 6 dB from max value of 32767 to 16384) program 16384.
  7. Follow step 14.
  8. The DAC should have outputs on both channels.