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Specifications of components in BOM

SaiTeja

NRF52832 reference design BOM did not specify the voltage rating of capacitors. What is the recommended voltage rating of capacitors?

For 32 MHz Crystal Oscillator, specified total tolerance is +/- 40 ppm. But specifications of my crystal oscillator are as follows : Frequency Stability : 10 ppm Tolerance : 30 ppm

Does this difference create any issue ?

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    Generally it is a rather moot point. Chip caps are very robust these days and most of the values required will probably have a 16, 25, or even a 50 volt rating and probably not less. Since the max voltage for a 52832 is 3.6 volts use minimum 6.3v parts or greater and you are good to go.

    In the RF section make sure the parts you are using are for RF applications. General purpose caps and inductors may perform poorly in those sections.

    The bluetooth spec for frequency accuracy is 40ppm. So including aging, initial offset, and temp change you should always be 40ppm or less. So 10 plus 30 as you noted should be fine. But I might suggest you choose a 10/15 or 10/10 part. Generally the price difference is minor and if you have some small errors on the capacitive loading that results in some freq pull then it won't matter.

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  • 0

    Generally it is a rather moot point. Chip caps are very robust these days and most of the values required will probably have a 16, 25, or even a 50 volt rating and probably not less. Since the max voltage for a 52832 is 3.6 volts use minimum 6.3v parts or greater and you are good to go.

    In the RF section make sure the parts you are using are for RF applications. General purpose caps and inductors may perform poorly in those sections.

    The bluetooth spec for frequency accuracy is 40ppm. So including aging, initial offset, and temp change you should always be 40ppm or less. So 10 plus 30 as you noted should be fine. But I might suggest you choose a 10/15 or 10/10 part. Generally the price difference is minor and if you have some small errors on the capacitive loading that results in some freq pull then it won't matter.

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