Analog Devices AD9714 Evaluation Board AD9714-DPG2-EBZ AD9714-DPG2-EBZ Hoja De Datos

 

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This section lists items to check and practices to use when 
debugging any unexpected performance of a board. It also 
provides information on how to check for proper operation 
when using the modulator in the signal chain. 

If unexpected results occur 

•  Reset the part (SW1) and rerun the SPI software. 
•  Sync/reset the clock (SW2) when using the clock chip. 
•  Check the voltage at TP30 (COREVDD), which should be 

1.75 V. 

•  Check the voltage at TP3 (VREF), which should be 1.0 V. 
•  Probe S11 (DATACLK) to be sure that the DAC is properly 

receiving data and that a clock signal is present. This signal 
can also be probed at R64 near the part on-board (should 
be unsoldered from initial setup instructions). 

•  When using the modulator, check to make sure the common-

mode voltage is 0.5 V at the input of the modulator by probing 
at R24 or R61 for the I or Q channels, respectively. 

If the common-mode voltage is not as expected, unplug the 
board and check the resistances at R13, R14, R52, and R53 for 
the correct values of the particular board. If a proper reading is 
not present, unsolder J13, J14, J19, and J23, which removes the 
resistors from the parallel connection with 1 kΩ/100 Ω at the 
input of the modulator to measure the individual resistances of 
those components. Check if the resistance values are still 
incorrect and if so, change out for the appropriate values listed 

above. If not, try resoldering the jumpers and test again to make 
sure there was not a problem with the previous connection. 

In this example, a clock signal is sent to the board through the 
clock distribution chip while data is input from the DPG2 and 
observed at the DAC output. A 20 MHz single tone is created 
and loaded through the DPGDownloader program and sent to 
the board.  

To create a single tone signal in the program 

1.  Select Add Generated Waveform and choose Single Tone 

from the drop-down menu. An item then appears in the 
downloader window.  

2.  Input the f

DAC

 as the Sample Rate and enter 20 MHz for 

. The DAC Resolution value is 14 bits, 

 of 0dB and Record Length is 16384, as shown 

in Figure 8.   

3.  Check the boxes next to Unsigned Data and Generate 

.  

4.  In the I Data Vector and Q Data Vector drop-down 

menus, choose the corresponding vectors from the list. 

5.  Press the download button (

) and once completed, press 

the run button (

) to complete the load. 

 

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