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CC1314R10: CC1312R1 vs CC1314R10 Balun and filters.

Michal Pokorny
Prodigy 10 points
Part Number: CC1314R10
Other Parts Discussed in Thread: CC1312R

Tool/software:

Hi,

we are switching our design from CC1312R1 to CC1314R10. The reference designs for balun and filter is different.

[q1] Is there any particular reason to have a different topology RF output circuit here? Can be the CC1312R1 reference design of balun and filters reused in CC1314R10 design?

[q2] Considering pictures below, do we have a correct understanding of function of each sections?

CC1312R1

CC1340R10

[q3] What is the purpose of the following section in CC1340R10 reference? Is it part of the filter? Is it mandatory, recommended, or optional?

Many thanks in advance,

Michal

  • 0
    TI__Genius 15495 points

    Editor's Note, below Michal mentions cc1340, but he mentioned offline that this is a typo and meant to reference cc1314.

    TY,

    CY

  • 0 in reply to Chris Yorkey
    TI__Mastermind 32910 points

    Hi,

    A1.

    For a 2-layer design it is recommended to follow the CC1314R RF topology that has a differential-filter, balun and a LPF network. This will have the lowest unwanted harmonic radiation (mainly 3rd harmonic radiated) and will have better margins to pass the FCC regulations.

    For a 4-layer design, both RF topologies can be used. However, I still would recommend differential-filter, balun and a LPF topology since this will have the lowest 3rd radiated harmonic compared to the CC1312R RF topology network (balun + LPF). 

    A2.

    Yes. "Filter and matching 1" section is a differential low-pass filter to attenuate the radiated 3rd harmonic as close as possible to the chip. i.e. this gives the least unwanted radiated emissions. Since we have this section, the "Filter and matching 2" section can be reduced slightly.

    A3. 

    This is the best harmonic attenuation for 915 MHz FCC ISM band in order to achieve the lowest conducted harmonics without relying on FCC duty cycling.

    If you have any more questions, we can take them off-line since I'm in sync with Chris as well with your timeline.

    Regards,

       Richard