4.3 Dual Channel Mode1 Setup
Use the following list to setup the dual DAC one data bank per channel:
1. Change the frequency of the signal generator connected to EXT_DACCLK (SMA J2) to 1.6GHz. Change the
frequency of the signal generator connected to LMK IN (SMA J25) to 400MHz.
2. Press the DAC RESET switch.
3. Click on the DAC12DL3200EVM
Low Level View
tab.
4. Click on the “File” icon and navigate to “EXT_CLK_Mode1_NRZ_Dual_DAC.cfg” and click on “OK” to load
the LMK and DAC registers.
This configuration file will setup the DAC to operate in dual channel mode, 1 bank of LVDS data only for
each DAC, with outputs available on CHA and CHB.
5. In the HSDC Pro GUI, in the device drop-down menu, select "DAC12DL3200_MODE1_12b_sync_istrb”. If
the firmware is already loaded, skip the next step.
6. When prompted, click
Yes
to update the firmware. After the firmware is downloaded, do the DxSTR register
write mentioned in the
7. Enter 1.6GHz for the Data Rate.
8. In the
I/Q Multitone Generator
window in the lower left of the GUI, enter the following parameters: # of tones
"1", tone center "1GHz" then click "Create Tones".
9. Click on "Send" in the upper left of the main GUI page to send the test tone to the DAC EVM. There should
now be a 1GHz output tone on CHA and CHB SMA connectors J1 and J4.
4.4 Dual-Channel 2xRF Mode 0 DAC Setup
This mode provides optimized output data in the 3rd, 4th, and 5th Nyquist regions:
1. Change the frequency of the signal generator connected to EXT_DACCLK (SMA J2) to 6.4 GHz. Set the
frequency of the signal generator connected to LMK IN (SMA J25) to 1.6 GHz.
2. Press the
DAC RESET
switch.
3. Click on the DAC12DL3200EVM
Low Level View
tab.
4. Click on the
File
icon and navigate to “EXT_CLK_Mode0_2xRF_Dual_DAC.cfg” and click the
OK
button to
load the LMK and DAC registers.
This configuration file sets up the DAC to operate in dual channel mode, 2 banks of LVDS data per DAC,
with the output available on CHA and CHB.
5. In the HSDC Pro GUI, in the device drop-down menu, select "DAC12DL3200_MODE0_12b_sync_istrb”. If
the firmware is already loaded, skip the next step.
6. When prompted, click
Yes
to update the firmware. After the firmware is downloaded, do the DxSTR register
write mentioned in the
7. Enter "1.6GHz" for the Data Rate.
8. In the
I/Q Multitone Generator
window in the lower left of the GUI, enter the following parameters: # of tones
"1", tone center "1GHz" then click "Create Tones".
9. Click the
Send
button in the upper left of the main GUI page to send the test tone to the DAC EVM. There
should now be a 1-GHz output tone on CHA and CHB SMAs. The image of this tone is optimized for 3rd
Nyquist, which is located at 7.4 GHz and 11.8 GHz in the 4th Nyquist zone.
4.5 Direct Digital Synthesis Mode
The DAC12DL3200 contains two numerically controlled oscillators (NCOs) that can optionally be used for direct
digital synthesis of tones for each DAC. There are two NCO banks, each with 16 separate 32-bit NCOs. The
banks can be used separately for each DAC, or together to provide 32 NCOs for one DAC. The two NCOs can
be summed as a two tone source for both DACs. The NCO frequencies are set using the dac_A/B_NCO column
in the DACA and DACB tabs. The phase is set using the dacA/B_phase column.
Other Modes of Operation
18
DAC12DL3200 Evaluation Module
SBAU374 – MAY 2021
Copyright © 2021 Texas Instruments Incorporated