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DAC3482: some problems with DAC3482 using the internal 4 fold interpolation

xingwei li
Prodigy 30 points
Part Number: DAC3482

Hello: I'm having some problems with DAC3482 using the internal 4 fold interpolation,

fDATA=500MHZ  2 fold interpolation, Using the following register configuration test, no problem

0x02-8000
0x00-0198
0x01-000e
0x03-7001
0x10-3000
0x18-2C67
0x19-20F4
0x1A-FC00
0x1b-0800
0x20-2201
0x24-0400
0x2d-0004
0x30-0000

 fDATA=312.5MHZ 4 fold interpolation, Using the following register configuration, the measured output waveform is incorrect

0x02-8000
0x00-0298
0x01-000e
0x03-7001
0x10-3000
0x18-2c5f
0x19-2894
0x1a-ac00
0x1b-0800
0x20-2201
0x24-0400
0x2d-0004
0x30-0000

  • 0
    TI__Guru* 91947 points

    Xingwei,

    We are looking into this.

    Regards,

    Jim

  • 0
    TI__Genius 12780 points

    Hi Xingwei,

    Are you using the DAC3482EVM? If so, please have a look at the attached power points that will have your DAC exhibiting the proper output (at the desired FDAC rates using the PLL).

    DAC3482_FDAC_500MHz.pptx

    DAC3482_FDAC_312.5MHz.pptx

    You will need to load these register files. They include the register settings that you posted.

    Fullscreen 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

    Fullscreen DAC3482_FDAC_312.5MHz_4xint.txt Download 
       x00	   x0298
   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	   x2C5F
   x19	   x2894
   x1A	   xAC00
   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 only thing I needed to modify (for both configurations) was the FPGACLK1 divider in the CDCE. The preset value is 16, and it needs to be changed to 4. Example of this is in the attached power points.

    Regards,

    Dan

  • 0 in reply to dBrock
    Prodigy 30 points
    HI,Dan
    thanks for your support!
    I tried, but the output waveform is still incorrect, please help to solve ,thanks
  • 0 in reply to xingwei li
    TI__Genius 12780 points

    Hi Xingwei,

    Can you explain a little further as to what is wrong with the waveform? Are you not seeing the desired tone at the output, or is the output looking like noise? If possible, please post pictures of the output.

    Also, can you please verify that you are using the DAC3482EVM along with the TSW1400EVM capture card? Thanks!

    Regards,

    Dan