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ADC12D1800RF :DES Timing

user4749326
Prodigy 20 points

Why  DES Timig adjust  does not work when using DESIQ or DESCLKIQ mode?

  • 0
    TI__Mastermind 44560 points

    Hi

    DES Timing Adjust (DTA, Register 7h) can be used in any of the DES modes (DESI, DESQ, DESIQ, DESCLKIQ).

    In DESIQ and DESCLKIQ the gain matching of the signal applied at the internal I and Q converters is not as good as it is in DESI or DESQ mode. Even with the DES Timing Adjustment optimized, the gain mismatch will cause the interleave spurs to be larger in DESIQ and DESCLKIQ than they are in DESI and DESQ modes.

    The Aperture Delay Adjust feature (Registers Ch and Dh) cannot be used in any of the DES modes for clock frequencies above 1600 MHz.

    Best regards,

    Jim B