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DAC3484: NCO only mode

Izik
Expert 1585 points

Part Number: DAC3484
Other Parts Discussed in Thread: DAC38J84

Hello 

Is there a mode that enables the DAC to output the NCO frequency? Without any data input? If so, can you please send the registers and data list? (similar to DAC38J84, for instance)

Thanks

  • 0
    TI__Expert 4880 points
    Hey Izik,

    Please send me your desired configuration settings and i will send you a config file.

    Dac sampling frequency
    Input data rate
    interpolation
    NCO frequency
    Input frequency
    Etc.

    Yusuf
  • 0 in reply to Yusuf%20Agoro
    Expert 1585 points

    Hi

    Fdac=960MHz

    NCO AB = 120MHz

    NCO CD = 240MHz

    NCO only mode so data and interpolation are irrelevant

    Thanks

    Izik

  • 0 in reply to Izik
    TI__Expert 4880 points

    Hey Izik,

    The NCO will receive data from the SPI Bus (enable through SIFDAC_ENA), and change the amplitude through SIFDAC(15:0)

    Move the NCO value for frequency change, and move the sifdac(15:0) for amplitude

    DATACLK is the only signal needed to latch in the SIFDAC data into the FIFO. DATACLK need to be running.

    Yusuf

  • 0 in reply to Yusuf%20Agoro
    TI__Expert 3367 points

    Izik,

    Did it answer your question ?

    Yusuf,

    Can you maybe attach a configuration file as example showing how to operate the device in NCO only mode (CW) without any data input ?

    Regards,

    Nir.

  • 0 in reply to Nir Flysher
    TI__Expert 4880 points

    Here you go!

    Yusuf 

    Fullscreen dac3484_NCO_settings.txt Download 
       x00	   xF08C
   x01	   x0100
   x02	   x8052
   x03	   xA001
   x04	   x4FF1
   x05	   x0260
   x06	   x2500
   x07	   xFFFF
   x08	   x0000
   x09	   x8000
   x0A	   x0000
   x0B	   x0000
   x0C	   x05A6
   x0D	   x05A6
   x0E	   x05A6
   x0F	   x05A6
   x10	   x0000
   x11	   x0000
   x12	   x0000
   x13	   x0000
   x14	   x0000
   x15	   x2000
   x16	   x0000
   x17	   x4000
   x18	   x205F
   x19	   x10F0
   x1A	   x4820
   x1B	   x0800
   x1C	   x0000
   x1D	   x0000
   x1E	   x1111
   x1F	   x8882
   x20	   x2400
   x22	   x1B1B
   x23	   x001F
   x24	   x1000
   x25	   x5A7A
   x26	   xB6B6
   x27	   xEAEA
   x28	   x4545
   x29	   x1A1A
   x2A	   x1616
   x2B	   xAAAA
   x2C	   xC4C4
   x2D	   x0004
   x2E	   x0000
   x2F	   x0000
   x30	   x61A0
   x7F	   x0004