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CC1310: Decoupling capacitors requirements

Michael Shklyarman
Genius 12670 points
Part Number: CC1310

Champs,

Due to manufacturing constraints customer needs  to deviate slightly from the reference design wrt decoupling capacitors. Referring to the below original schematics they would like to remove C17 and increase the capacitance of C18 to 42uF, and C19 and C24 to 15uF

My questions is whether the CC1310 is very sensitive to having the smaller capacitance caps to decouple higher frequencies components in the rail and would it be safe to make this change. The other part of the circuitry have their own by-pass capacitors, but what we are concerned about is the C1310.

Thanks

Michael

  • 0
    TI__Guru**** 317180 points

    It's not possible to know for sure how a given decoupling will impact performance without doing tests.

    I would keep the 0.1 uF caps since the purpose of these is to take spurs on the power lines.

    The large caps main function is to ensure a wanted voltage level when the current has transients, typically when the chip goes from a low power mode and directly to send max output power. It will depend on the power supply/ battery what is needed here. If a power supply with fixed 3.0 V and low ESR will keep the voltage stable even with removing a fair amount of the decoupling. If you have a battery with high ESR all decoupling is likely to be needed. 

    I would advice to test with their power source on a launchpad or similar and test with different variations of the decoupling to check the impact.