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CC1200 with CC1190 and Johanson Balun

pixbroker
Genius 5820 points
Other Parts Discussed in Thread: CC1190, CC1200, CC1120

I am looking for a reference design connecting a CC1200 to a CC1190 via Johanson 0900PC15J0013 Balun. Can someone point me to some schematic that shows how this is done correctly? Thank you.

  • 0
    TI__Mastermind 39860 points
    For this you need to combine 2 of the reference design

    CC1200 part (868/915 MHz): Use the CC112x+IPC reference design (www.ti.com/lit/zip/swrr107). Replace CC1120 with CC1200, C231 should be 1.5 nF, crystal needs to be changed to 40 MHz.

    CC1190 part (915 MHz): Copy the CC1190 part from the CC1120+CC1190 reference design (www.ti.com/lit/zip/swrr089). Connect the SAW filter to C203 in the CC112x+IPC design.

    CC1190 part (868 MHz): Copy the CC1190 part from the CC1120+CC1190 reference design (www.ti.com/lit/zip/swrr092). Connect the SAW filter to C203 in the CC112x+IPC design.
  • 0 in reply to Sverre
    Genius 5820 points

    If i use Johanson 0900PC15J0013 Balun between CC1200 and CC1190, do i still need U1 (SAW Filter)? If yes, it should just connect to pin 7 (ANT) of the johanson balun? do i still need L111 & C111 between SAW filter and CC1190?

  • 0 in reply to pixbroker
    TI__Guru**** 317180 points
    Yes, you would need the saw filter to attenuate the phasenoise at the band edge to pass regulation. It's recommended to keept the two components between the saw and cc1190 for best performance. You can connect the saw filter directly to the balun output.
  • 0 in reply to TER
    Genius 5820 points
    We have a very space restricted project and the B39871B3725U410 filter doesn't really fit. What are the performance implications of leaving out the filter in a CC1200->CC1190 design? Possibly leaving out the 2 passives as well.

    Thank you.
  • 0 in reply to pixbroker
    TI__Guru**** 317180 points
    As stated in my previous post you need the SAW filter to pass ETSI 300-220. If you skip the SAW filter the output power has to be reduced some.