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CC1200: spurious for ARIB STD T108

Part Number: CC1200

Hi,

In the report swra445 "Using the CC1200 Under ARIB STD T108", Figure 7. Spurious Emission 915 MHz - 920.4 MHz shows 3dB margin.

(1) How is the worst spurious level for mass-production?

(2) Is there any means to reduce  spurious level? (For example,changing the register regarding Frequency Synthesizer parameter.)

best regard,

S.Umetsu  

  • 1) The data we have on this is in the app note. We have measured on 6 samples and from this it's not possible to know how the spurious will over mass production

    2) The settings used in the app note are the ones found to give the lowest spurious level.
  • Sorry for my late response to your answer.
    The datasheet SWRS123D says that it complies with ARIB STD-T108,and so on.
    I understand that CC1200 can be used and complies for mass-production.
    If it may not comply with ARIB STD-T108,how we should do?
  • As the appnote show the 6 samples we have measured are compliant with T-108. As we don't measure all samples we produce with regards to this standard we don't know if all samples are compliant.
  • Of course,I don't request you to measure all samples in mass-production. 

    As the datasheet shows CC1200 complies with T-108, we will use CC1200 in our product.

    Also in our trial prudution,its spurious emission had several margin for T-108.

    I want to know CC1200 circuit design will keep complient with T-108.

    (not request for mass-production measurement)

    I believe so,because of its discription in the datasheet.

      

  • When CC1200 is described as compliant in the datasheet it is reality the EM design that is compliant since it's not possible to measure the chip without external components.
  • What I want to know is that the board which CC1200 is implimennted complies with T-108. Of course,the board should be well designed.

    If it might not comply with T-108,we could not use CC1200. I belive such
    problem never happens.
  • Not sure what you are asking about. The EM is the board we have tested CC1200 and which is compliant with T-108.
  • I didn't I ask you about EM.

    I asked you about spurious of CC1200. 

    Application report(SWRA445) is the report using "samples", and they passed with some margin.

    It is important to keep compliance with regulation not only "samples"  but also "our mass-production".

    .At least magin>=0dB.

    It is described clearly in CC1200 datasheet (SWRS23D)  as below. So I belive no problem.

      • Regulations – Suitable for Systems Targeting
        Compliance With

       – Japan: ARIB STD-T30, T67, T108

    I hope you to understand my question.

  • In general it's not possible to state that a chip pass a standard since external components will impact the RF performance. In the first page of the datasheet we write "suitable for systems targeting" since we have shown that we are able to pass the given standard using our EMs.

    With regards to SWRA445, if you look in the introduction chapter you will see which hardware that is used for the measurements. Samples in this app note refers to one of the EM types listed.
  • Of course, I know that the characteristic depends on how to design the product.
    By the way, your reply in this time is enough to me.
    Thanks a lot!