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CC1310: CC1310 /CC1312 169 MHz balum and LC filter design guidelines

Part Number: CC1310
Other Parts Discussed in Thread: CC1312R, CC1120, CC1352P

Hello!, I am currently going to order some CC1310 and CC1312 to work with 433 MHz and 169 MHz in a forest environment and the amounts. values for 433 MHz were found in TI provided schematics, , but not for the 169 MHz band. I also checked the "CC13xx/CC26xx Hardware Configuration and PCB Design Considerations"  and I was not able to find the method for calculating the Balum network and LC filter (only their concept and requirements).

Questions:

1 Is the CC1310 capable of handling the 169 MHz band?, I ask this because a User of this community claimed that was able to make it work as a transmitter for that frequency but there are no details regarding their behavior as a receiver. This is important because it will be really useful for the project to make both CC1312 and CC1310 work at  169 MHz band

link : https://e2e.ti.com/support/wireless-connectivity/sub-1-ghz-group/sub-1-ghz/f/sub-1-ghz-forum/689209/cc1120em-169-rd-frequency-change-of-the-physical-module/2541510?tisearch=e2e-sitesearch

2 Is there any document that details how to design the Balum and LC filter? is any software to calculate the matching network values for that frequency?

Best Regards

Andres

  • Hi,

    CC1310 does not support 169 MHz.

    CC1311x, CC1312R and CC1352x supports 169 MHz.

    CC1120 works at 169 MHz but this is only a transceiver.

    The balun and LC filter optimization are from load-pull and load-source measurements and ADS simulations.

    Recommend to copy the 169 MHz ref design from the CC13xx design or the CC1120 design.

    For a long range distance in a forest environment, I would use 169 MHz instead of 433 MHz.especially if you can use an external antenna. Also, the 169 MHz band allows higher output powers (30 dBm).

    Regards,

       Richard

  • Hello Richard, and thank you for your answers. I did not found 169 MHz design for the CC13xx  (only for the CC1120 design, but the balum and LC filter topology is completely different to the used in the CC13xx designs), so if you have some CC13xx  169 MHZ  examples it will be really useful.

    Regarding the 169 MHz, we are not going to use a wire antenna because we want one version of the PCB to be put inside animals with a size as small as possible (20*10 mm size will be a good start point). With a ground plane of such a size, is advisable to use 169 MHZ or go with 433 MHz ?(more taking into account  the fact that CC1310 does not work with 169 MHz and we would like to use CC1312R for bigger pcb version and CC1310 for the smaller ones)

    Also, can CC1312 be configured to work at CC1310 lowest frequency band (315 MHz)?

    I tried to find CC1311 but i did not find the product on providers like mouser, but CC1311 will be a excellent alternative to CC1310.

    Thank you in advance for your help, this kind of support is one of the reasons that make us choose TI SoC instead of other SoC for this application. 

    Best Regards

    Andres

  • HI,

    Attached a preliminary schematic for CC1352P at 30 dBm for 169 MHz. For greater than 20 dBm output power, we use a Skyworks FEM. 

    SCHEMATIC - LP-CC1352P-5.pdf

    For a PCB size of 20 x 10 cm, at 169 MHz the antenna efficiency will not be too good. You will have an efficiency of around 10-20 % so for your range calculations I would count on 8 dB loss just in the antenna. For 433 MHz, same size I would count on a 2 dB loss.

     For 433MHz, 10 dBm output*1, 2.5 kbps LRM, Environment noise of -95 dBm*2, 2 dB loss in antenna, 1m height of antennas would expect 360 m range.

    Even at 14 dBm would expect 460 m range.

    For 169MHz, 14 dBm output, 2.5 kbps LRM, Environment noise of -95 dBm*2, 10 dB loss in antenna, 1m height of antennas would expect 860 m range.

    For 169MHz, 30 dBm output, 2.5 kbps LRM, Environment noise of -95 dBm*2, 10 dB loss in antenna, 1m height of antennas would expect 2460 m range.

    *1 limited to regulations

    *2 environment noise is dependent on country of operation

    So I still would use 169 MHz than 433 MHz.

    CC1312 can operate at 315 MHz but this has not been fully characterized. 

    CC1311x is similar to CC1312x apart from the sensor controller has been removed in CC1311x. 

    Regards,

       Richard

  • Hello Richard. Thank you for the Schematic, the network is not the same but is enough to get a solution :).\

    Regarding the range, the PCB size ( 10*20) is in milometers, not in centimetres (will be 1*2 cm). But i get the idea. Also, we are not going to use an rf amplifier in the smallest PCB because is going to be feed with a very low power battery. I think that based on all of this we are going to go with 433 MHz approach.

    Also I am not able to find the CC1311 even in the TI product catalog. Is this product commercially available?

    I will mark this as resolved, but if to want to add any comment based on my conclusion will be more than welcome :).

    best regards

    Andres