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DAC3482EVM: with TSW1406EVM

Rick Jones78
Intellectual 340 points

Part Number: DAC3482EVM

Hello,

After reviewing the DAC3482EVM manual (SLAU432A) and the TSW140x User's Guide (SLUW079D), I think I have an output.  Can the setup be changed easily to allow slower clocks and lower frequencies? 

Please describe.

Thanks

  • 0
    TI__Genius 12780 points

    Hi Rick,

    To answer your question directly, yes! The DAC3482EVM GUI allows for easy configuration of the DAC Clock and Data Clock by modifying values such as clock dividers or interpolation rates. In addition, the TSW1406EVM software, HSDC Pro (High Speed Data Converter), allows for easy configuration and pattern generation at your specified data rate.

    Here is a quick example of how you could use the DAC3482EVM, in conjunction with the TSW1400EVM (setup would be almost the same with the TSW1406EVM).

    7853.DAC3482_FDAC_500MHz.pptx

    Hope that helps!

    Regards,

    Dan

  • 0 in reply to dBrock
    Intellectual 340 points

    Thanks Dan, this gets me started.  I have more questions.  

    1. External Clock to DAC3482EVM

    Currently the external clock to the DAC3482EVM is 25MHz sine, 0V to 1.3V.  Does it matter?  and how to adjust for this?

    I have the possibility of using another faster clock, but has 0V offset (goes +/-), but does the board have provision for this type of signal?

    2. Where can I find the file to load (DAC3482_FDAC_500MHZ_2xint.txt)?  

    I only have "DAC3482_FDAC_1228p8MHz_4xint_NCO_30MHz_QMCon.txt"

    And this is to install in the HSDCPro GUI?

    Is there a repository, or could you send it?

    Can I make/modify files to fit what I need?

    3. There were a lot of changes to the DAC348x_GUI_v3p8.vi, which I made blindly.  

    Is there a guide for what to change in the GUI based on my application needs?

    4. The HSDCPro GUI shows I have a nice output (see below), but I see only noise on my 300MHz, 2.5GS/s scope (with only one scope input on) from any of the DAC3482EVM's 4 SMA outputs.  The DAC's GUI tab "Digital" "DAC Gain" and varying from 1 to 15 had no effect on either physical output or the HSDCPro GUI's min/max DAC codes (+/-32k is full scale).  I'm confused.

  • 0 in reply to Rick Jones78
    TI__Genius 12780 points

    Hi Rick,

    You can send a reference clock with 0VDC offset since the EVM has provisions for this.

    The file to write the registers for the example I provided is attached here 

    Fullscreen 1030.DAC3482_FDAC_500MHz_2xint.txt Download 
       x00	   x0198
   x01	   x000e
   x02	   x8000
   x03	   x7001
   x04	   x4DF1
   x05	   x0000
   x06	   x3400
   x07	   xFFFF
   x08	   x0000
   x09	   x8000
   x0A	   x0000
   x0B	   x0000
   x0C	   x05A6
   x0D	   x05A6
   x0E	   x05A6
   x0F	   x05A6
   x10	   x3000
   x11	   x0000
   x12	   x0000
   x13	   x0000
   x14	   x0000
   x15	   x0640
   x16	   x0000
   x17	   x0640
   x18	   x2C67
   x19	   x20F4
   x1A	   xFC00
   x1B	   x0800
   x1C	   x0000
   x1D	   x0000
   x1E	   x1111
   x1F	   x8882
   x20	   x2201
   x22	   x1B1B
   x23	   x001F
   x24	   x0400
   x25	   x7A7A
   x26	   xB6B6
   x27	   xEAEA
   x28	   x4545
   x29	   x1A1A
   x2A	   x1616
   x2B	   xAAAA
   x2C	   xC6C6
   x2D	   x0004
   x2E	   x0000
   x2F	   x0000
   x30	   x0000
   x7F	   x0001
CDCE62005 Registers
Freq:19.200000MHz
Address	Data
00		80400000
01		813C0001
02		81400002
03		C10C0003
04		00040004
05		29F01A55
06		44AF0006
07		165294A7
08		20001808

    The DAC3482EVM GUI comes with a few register settings, as you have seen, but this example is one that I created to show how the PLL can be used. Unfortunately, there is not a repository of files.

    If you made changes to the GUI files, I would recommend reinstalling the GUI to ensure factory settings have been restored.

    One extremely important item to note is that you must install and run (every time) the DAC3482EVM GUI as an administrator. I have noticed that it will not write to the registers reliably if you do not do this. This may be why you are not seeing an output.

    Regards,

    Dan