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CC1125: CC1125

Yair Shuvali
Prodigy 30 points
Part Number: CC1125
Other Parts Discussed in Thread: CC1201, CC1101, CC1200

Dear R & D team

I have 2 TI candidates for my new project )CC1125 & CC1201) 

I need to take a decision for the best RF module that will meet my needs

My application to capture sensors at Sub 1G (433MHZ)

T433MHZ

Modulation: 2- FSK 

Baud rate: 9600

Deviation: +/- 44khz 

Coding: Manchester 

 When considering the above parameters what is the best choice for my application , more explanation will be helpful 

  • 0
    Prodigy 30 points

    our previous module was CC1101 

    Could you please outline the differences between this item and the CC1125 or CC1201 in terms of RF sensitivity?

  • 0 in reply to Yair Shuvali
    TI__Genius 11975 points

    Hi Yair,

    The CC1125 is most suited for narrowband applications (with lower datarates) and offers the best performance for this purpose, including better Blocking and Adjacent Channel Selectivity performance (in RX).

    These can be compared in the device datasheets - the PHY settings for the datasheet characterisation of the two devices are not 1-1, so investigating the performance in the datasheet for your needs will be required. The CC1125 will give better performance for narrowband applications than the CC1201.

    Regards,

    Zack

  • 0 in reply to ZC
    Prodigy 30 points

    Hi Zack

    That's mean that when considering my application as describes at my previous reply you suggest choosing CC1125?

    Do you need further information, or my application is clear? 

  • 0 in reply to Yair Shuvali
    Mastermind 6130 points

    If you are using  44 kHz deviation, then you don't have a narrowband application and you should go for CC1200/1

  • 0 in reply to TheGhostOf
    Guru 35525 points
    TheGhostOf said:
    If you are using  44 kHz deviation, then you don't have a narrowband application

    So where is the border between "narrow-" and "not narrow-" band?

  • 0 in reply to Andy Neil
    Prodigy 30 points

    Hii team

    Thanks for the question, Andy, (I though 44KHZ is a narrow band application)

    So now I have got confused.

    Based on my application what is the preferred module? 

    Can you please advise what is the RF sensitivity in my case? 

    As mentioned before: 

    Frequency: 433MHZ

    Modulation: 2- FSK 

    Baud rate: 9600

    Deviation: +/- 44khz 

    Coding: Manchester 

    Thks

    Yair

  • 0 in reply to Yair Shuvali
    Guru 35525 points

    I'm no RF expert - I'm just wondering where TI draw their lines (no doubt they are not sharp lines).

    I guess that "narrow" is relative to the carrier frequency?

    The CC1125 datasheet speaks of, "Narrowband Ultra-Low-Power Wireless Systems With Channel Spacing Down to 4 kHz" - so that clearly is far narrower than your 44kHz!

  • 0 in reply to Andy Neil
    TI__Genius 11975 points

    Hi,

    Apologies, there was a national holiday so TheGhostOf answered before me - the CC1200/1 is likely the most suitable for this application.

    You are correct that the definition of narrowband depends on the application, but in this context narrowband is defined according to ETSI 300 220-1 for a Category 1 receiver. This is typically a receiver bandwidth of less the 25 kHz receiver bandwidth (however, it is possible to pass the Category 1 requirements  with higher bandwidths than 25 kHz).

    So, it is the operating channel width that is used in this specific context to define narrowband.

    It is not up-to-date with the latest ETSI 300 220-1 revision (you can find this on the ETSI website), but this App Note gives an introduction to the regulation requirements for a Category 1 receiver and is still relevant: https://www.ti.com/lit/swra424

    The CC1125 is designed to pass the ETSI Category 1 receiver regulations, whilst the CC1201 is not. However, note that the definitions have changed with the ETSI revisions, and is mainly relevant now in specific receiver applications such as social alarms. In any case, the required RX bandwidth here would mean this application is not narrowband for this purpose.

    Yair, I will need to respond to the Sensitivity estimate the first half of next week.

    Regards,
    Zack