TSW30SH84EVM Changing Data Rate with GUI No PLL, External Reference

Hardware Setup

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.

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

GUI Setup

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

HSDC Pro: Create Tone

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

DAC Output

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.

Adjust GUI (Interpolation)

Adjust GUI (LMK)

HSDC Pro (125M data rate)

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).