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LMX2595: CHDIV_DIV2 setting

JM_
Prodigy 20 points
Part Number: LMX2595


In Table 33 of the LMX2595 datasheet, it states that the CHDIV_DIV2 field should be set to 1 if CHDIV is greater than 2.  The CHDIV field in register 75 contains an enumerated value that maps to a divider value.  I just want to clarify the relationship between CHDIV_DIV2 and the CHDIV value with a few examples:

If I set CHDIV to 0 (which corresponds to a divider value of 2), should I set CHDIV_DIV2 to 0?

And if I set CHDIV to 1 or greater (which corresponds to a divider value of 4 or greater), should I set CHDIV_DIV2 to 1?

Thank you in advance for any clarification you can provide!

  • 0
    TI__Mastermind 28021 points

    JM,

    I encourage you to download the most recent datasheet from the web.  We have renamed "CHDIV_DIV2" to "SEG1_EN"

    1.  If you set CHDIV to 0, then we recommend setting SEG1_EN=0.  If you set SEG1_EN=1, the device will work fine, but it can introduce a small spur and unnecessary current draw. 

    The one exception to this rule is if you are in SYNC mode with the channel divider of 2.  In this case, SEG1_EN=1 is required.

    2.  If you set CHDIV to 1 or greater (divide of 4 or higher), then indeed SEG1_EN (what you are calling CHDIV_DIV2) should be set to 1.


    Regards,

    Dean

  • 0 in reply to Dean Banerjee
    Prodigy 20 points
    Thank you! This answers my question. The datasheet on the web (www.ti.com/.../technicaldocuments) still has the field named as CHDIV_DIV2 though. Is there a different link from which I can obtain the new datasheet?