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PCB antenna for CC2500

Jack99
Prodigy 100 points
Other Parts Discussed in Thread: CC2500, CC2511

Hi,

 

With the CC2500 I am going to use the 2.4 GHz PCB antenna as described in the Application Note 043.

 

I have a question regarding the circuit between the CC2500 and the antenna (the BalUn circuitry)..

 

The CC2511 USB dongle reference design uses a JTI_2450BM15A0002 Balun, I cannot seem to find a supplier for this component, so can I just make the balun circuitry by copying the circuit found in CC2500EM Reference Design 3.0 (Rev. A) ?

Will the values of the components need to change from those specified in CC2500EM Reference Design 3.0 (Rev. A)?

 

Thanks

  • 0
    TI__Genius 12545 points

    Hi Jack,

    The JTI_2450BM15A002 Balun is provided by Johanson Technologies. http://www.johansontechnology.com/en/integrated-passives/rohs-compliant-baluns.html

    Yes, you can use the the CC2500EM Reference Design 3.0. The idea is to match to the impedance of 50 ohm for the antenna input and the balun output.

  • 0 in reply to Chatto
    TI__Genius 12545 points

    Another thing to remember. The 2450BM15A002  is matched for the CC253X.

    There is a CC2500 specific balun as well. 2450BM15B0003

  • 0
    Intellectual 590 points

    Hi Jack,

    For the CC2500, we would like to recommend Anaren BD2425N50ATI (http://www.anaren.com/Content/File/Product/BD2425N50ATI%20Data%20Sheet%20Rev%20A.pdf), which is specifically used on Anaren's A2500R24 modules, which comprises of CC2500 and its RF  matching circuitry.

    We would also like to recommend you to check out our A2500R24A modules

    (http://www.anaren.com/content/File/100909a-%20A2500R24A%20Prod%20Brief%20STD%20RES.pdf)

    which is a complete modular solution for CC2500 and a PCB antenna that you referred to. It is FCC and ETSI certified and already available for sampling and distribution.

    - The AIR team at Anaren.

    Anaren is a third party Developer Network Member for Low Power RF and MCUs.

  • 0
    TI__Expert 4435 points

    Jack,

    Yes this will work with to copy the reference design.    The only caution is pay attention to the board stack up.  These discrete baluns are designed with microstrip lines where we pay attention to the traces values.    If you change the board stack up you will change the impedance and cause a slight mismatch.   This is covered in AN068.   The JTI is from Johnasen Componets.  It should be avaliable in Digit-key if not you can call them directly and they will help you out.    The choice is pretty simple the component ones are slightly lower cost at small volumes and roughty about half at large volumes. 

    I preferr the discrete ones because you can tune them easily.   The insertion loss can be done as low as .25 dB the discrete balun typically .5 dB insertion loss. 

    Rgds

  • 0
    Prodigy 95 points

    The part number is actually 2450BM15A0002 from JTI (Johanson Technology Inc) and not JTI_2450BM15A0002.  At the time of this post (08-Dec-2010) www.findchips.com list the part as available from Digi-key (712-1536-1-ND) and Arrow Electronics.