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LMX2820: Should MASH_RESET_N be changed to 0 for integer N mode?

K
Prodigy 92 points
Part Number: LMX2820
Other Parts Discussed in Thread: LMX2594

When using the LMX2820 in integer N mode, should the MASH_RESET_N bit in Register 35 be set to 0?

On a related chip like the LMX2594, the MASH_RESET_N is set to 0 for Int-N and set to 1 for Frac-N mode. Does the same apply for the LMX2820?

Is there some internal PN generator (spur source) or circuitry that is disabled when MASH_RESET_N is set to 0?

Thanks

K

  • +1
    TI__Guru** 110700 points

    Hi K,

    whenever the fractional numerator equals 0, there will be no performance difference between fractional mode or integer mode. Our suggestion is to keep the device in fractional mode for flexibility. You can set the MASH order to "integer" to force the PLL ignores the numerator.