1. TSW30SH84EVM Changing Data Rate with GUI
No PLL, External Reference

2. Hardware Setup

3. Hardware Setup
J12 (CLKIN1) is supplied with 500 MHz, 10 dBm, signal source
J19 (LO In1) is supplied with 1780 MHz, 10 dBm, signal source
Connect J7 (RFOUT1) to spectrum analyzer.

4. GUI Setup
Load Regs file “DAC34SH84_1474p56MHz_2xINT_NCOenabled_30MHz_single_sync_source_mode.txt”
Disable the NCO and other digital effects by unchecking the “Digital Mixer” box

5. GUI Setup

6. HSDC Pro
After selecting the DAC34SH84 device, set the data rate to 250M (DAC_CLK/Interpolation).
Create a tone (30 MHz) using HSDC Pro as seen on next slide (Ensure that you have set the data rate before creating the tone).
Click Send button

7. HSDC Pro: Create Tone

8. DAC Output
Looking at the spectrum analyzer, you will see the 1780 MHz LO plus the 30 MHz signal coming from the TSW1400.

9. DAC Output

10. Adjusting Data Rate
Now, lets set the data rate to 125 MSPS using the GUI.
This will require us to increase the interpolation rate to 4x, and change one of LMK dividers.
We will also need set the data rate to 125M (and create a new tone) on HSDC Pro.

11. Adjust GUI (Interpolation)

12. Adjust GUI (LMK)

13. HSDC Pro (125M data rate)

14. DAC Output
The output here looks identical to that of the 250MSPS data rate.
To lower the data rate further(62.5 MSPS), follow the steps again while incrementing the interpolation value (8x) and clock divider value accordingly.
One thing to note is that the DAC output waveform will degrade once your output gets close to DataRate/2 (you will see this at 62.5 MSPS if you use the 30MHz output as we did in the examples).