SBAU466 October   2024 DAC39RF10 , TRF1108

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Required Equipment
    2. 2.2 Setup Procedure
      1. 2.2.1  Installing the High Speed Data Converter (HSDC) Pro Software
      2. 2.2.2  Installing the DAC39RF10EVM Configuration GUI Software
      3. 2.2.3  Connect the TRF1108-DAC39RFEVM and TSW14J59EVM
      4. 2.2.4  Connect the Power Supplies to the Boards (Power Off)
      5. 2.2.5  Connect the Spectrum Analyzer to the EVM
      6. 2.2.6  Turn On the TSW14J59EVM Power and Connect to the PC
      7. 2.2.7  Turn On the TRF1108-DAC39RFEVM Power Supplies and Connect to the PC
      8. 2.2.8  Turn On the Signal Generator RF Outputs
      9. 2.2.9  Launch the DAC39RF10EVM GUI and Program the DAC EVM
      10. 2.2.10 Programming the NCO
        1. 2.2.10.1 SPIDAC (NCO only) Operation
      11. 2.2.11 Launch the HSDCpro Software and Load the FPGA Image to the TSW14J59EVM
    3. 2.3 Device Configuration
      1. 2.3.1 Supported JESD204C Device Features
      2. 2.3.2 Tab Organization
      3. 2.3.3 Register Map and Console Control
    4. 2.4 Troubleshooting the TRF1108-DAC39RFEVM
    5. 2.5 Customizing the EVM for Optional Clocking Support
      1. 2.5.1 LMX->DACCLK | LMX/LMK-> FPGA option (Default)
      2. 2.5.2 EXT->DACCLK | LMX/LMK-> FPGA Clocking Option
      3. 2.5.3 EXT->DACCLK | LMK-> FPGA Clocking Option
    6. 2.6 Signal Routing
    7. 2.7 Jumpers and LEDs
  8. 3Hardware Design Files
    1. 3.1 Schematics
    2. 3.2 PCB Layouts
    3. 3.3 Bill of Materials (BOM)
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5References
    1. 5.1 Technical Reference Documents
    2. 5.2 TSW14J59EVM Operation

2.2.10 Programming the NCO

The following steps are only needed when DAC is programmed to JMODE 1 to 7. For JMODE0 the NCO configuration can be skipped to Section 2.2.11. For JMODEs 1 to 7 when number of streams M is greater than or equal to 2 and interpolation factor is also set to greater than or equal to 2, the NCO (numerically controlled oscillator) can be used to mix I/Q baseband signal to generate a higher output frequency signal from the output of the DAC.

CAUTION:

Mixer Scaling

The DUC (digital up convertor) mixer supports complex-to-complex or complex-to-real-mixing of the complex interpolated input signal with the NCO frequency. The scaling in the mixer is exactly 1:1, so a full-scale 16-bit (absolute amplitude = 32767) complex tone results in a full-scale real or complex tone at the output. If the input absolute value of the complex amplitude exceeds 32767 the mixer saturates, then resulting in a corrupted waveform. The valid circular region in white and invalid corners in gray are shown in Figure 2-4.

TRF1108-DAC39RFEVM Mixer Saturation Region for the 16-bit Complex Input Figure 2-4 Mixer Saturation Region for the 16-bit Complex Input

The relationship of interpolation factor and number of streams to number of DUCs that can be used is shown in Table 2-2.

Table 2-2 Supported Interpolation Factors vs Number of DUCs Enabled
Number of Streams Interpolation Factors DUCs Enabled
2 2-256x DUC0
4 4-256x DUC0, DUC1
6 8-256x DUC0, DUC1, DUC2
8 8-256x DUC0, DUC1, DUC2, DUC3
TRF1108-DAC39RFEVM NCO TAB CONTROLS Figure 2-5 NCO TAB CONTROLS

With the EVM GUI open on the PC, navigate to NCO tab on upper left side of the GUI.

  1. To set the NCO, uncheck the DP Enable box.
  2. Uncheck the JESD Enable box.
  3. Check the NCO Enable box.
  4. In this example, JMODE was set to 1 and number of stream is set to 2. The interpolation factor is set to 2. Only DUC0 can be used, and other DUCs have been grayed out as shown in Table 2-2. The data from DUC0 is routed to DAC0 and DAC1.
  5. Enter the Frequency in MHz.
  6. Check the JESD Enable box.
  7. Check the DP Enable box.