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CC1101-Q1: Reference design for CC1101-Q1

Alex Naylor
Prodigy 210 points
Part Number: CC1101-Q1
Other Parts Discussed in Thread: CC1101,

I see that the CC1101 has a reference design for 434 MHz, but I did not see one specifically for the CC1101-Q1. I imagine that the only difference is the decoupling, but does TI have a specific reference design for the CC1101-Q1?

Thank you,

Alex

  • 0
    TI__Guru**** 317180 points
    I haven't seen any specific on for CC1101-Q1. Use the CC1101 reference designs as far as possible. In addition place vias close to all ground pins to ensure good grounding. All the Vdd decouplings should be the same as for CC1101.
  • 0 in reply to TER
    Prodigy 210 points

    In that case, I'll aim to put a dedicated decoupling capacitor on each power pin. 

    In the CC1101, are all of the AVDD pins internally tied together? I noticed that pins 11 and 15 (220 pF, NP0) have different values from pins 14 and 9 (10 nF, X7R):

    The CC1101-Q1 obviously has more power pins, and was just wondering how the values for the CC1101 pins were chosen.

    Thank you,

    Alex

  • 0 in reply to Alex Naylor
    TI__Guru**** 317180 points
    The AVDD pins are not directly connected internally, the go to different power segments on the chip.
  • 0 in reply to TER
    Prodigy 210 points
    Okay, thanks. In that case, how were the values determined for the AVDD pins on the CC1101? Just looking for an idea of what values and temperature coefficients to use for the various AVDD pins on CC1101-Q1.
  • 0 in reply to Alex Naylor
    TI__Guru**** 317180 points
    Decoupling is not an exact science and the values are a bit from trial and error. Using the same value (100 nF) for all of them is a good start and use the same temp coef as in the ref design. If the spectrum contains some spurs you have to look more closely.
  • 0 in reply to TER
    Prodigy 210 points
    Great, thank you for the quick responses.