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CC2530: Crystal frequency tolerance_CC2530

John Man
Prodigy 100 points
Part Number: CC2530

Tool/software:

Hello,

I am using CC2530F256. In the datasheet, I find the frequency tolerance of 32.768KHz crystal oscillator is so tight. I can not find a crystal oscillator which can meet +/-40ppm over temperature (-40~85degC).

Even the crystal oscillator used in CC2530 EM can not meet this requirement. Per calculation, the frequency tolerance during -40~85degC can reach -169 PPM, but the datasheet requests +/-40 ppm including aging and temperature dependency, as specified by [1].

Can you advise me why such tight frequency tolerance is required over temperature?

Thanks

John

  • +1
    TI__Expert 4870 points

    Hi John,

    You are correct and thank you for catching this. This seems to be an error in the datasheet as all of our recommended 32.768KHz crystals have a parabolic curve for the frequency tolerance. What it should have said is the parabolic coefficient is -0.04 which is our standard requirement this crystal.

    I will bring this up with my team and have it corrected.

    Best regards,

    Bun