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ADC32RF45: ADC32RF80 Spur?

HENRY JUNG
Expert 2030 points
Part Number: ADC32RF45
Other Parts Discussed in Thread: ADC32RF80

DEARS.

We are developing ADC32RF80.
Spur occurs at 2580.48Mhz
The target frequency overlaps the Spur frequency.
2949.12Mhz*(7/8)=2580.48Mhz
Spur occurs at a multiplication frequency of 368.64Mhz
How do you avoid spur?
We need a solution.

Our settings are as follows.
- Sampling Rate: 2949.12MHz
- Target Frequency : 2580.48MHz
- CLK Input: 2949.12MHz
- Decimation: /16
- LMFS: 4841
- Lane Rate: 7372.8Gbps
- K: 6
- SYSREF CLK: 5.12MHz

Thank you

  • 0
    TI__Expert 3515 points

    Hi,

    This seems to be the interleaving spur. Can you give more details like:

    1. is this on our EVM or customer board?

    2. are you using the EVM GUI to configure the ADC?

    3. package marking on the ADC. this will identify the silicon revision.

    The default config file usually has the IL spur correction turned on which will notch the spur. So, I'm curious if it has been turned off.

    Regards,

    satish.

  • 0 in reply to Satish Uppathil
    Expert 2030 points

    Dear.Satish

    1. is this on our EVM or customer board?

    => Customer Board

    2. are you using the EVM GUI to configure the ADC?

    => EVM GUI is used.

    3. package marking on the ADC. this will identify the silicon revision.

    => RTM Version. Customer received a sample in June 2017.

  • 0 in reply to HENRY JUNG
    TI__Expert 3515 points

    Hi Henry,

    How do you program the device with EVM GUI if it's mounted on customer board?

    Can you download the GUI from the web and use quick-start to program the device. by default, the IL spur correction engine is turned on and so you shouldn't the spur. However, if the signal resides at that frequency, please note it (the signal) will be notched as well.

    Regards,

    satish