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CC1120: CC1120, CC1125

Leif Gunnar Ellingsen
Prodigy 80 points
Part Number: CC1120
Other Parts Discussed in Thread: CC1125, , CC1190, CC1310

Hello,

We searching for a radio solution, with as high performance as possible with the cost down (earlier used Satel radios which have a high cost), and for this we look at the CC1120 or CC1125 with the CC1190 front-end. We thinking of using the radio in the 434 or 868Mhz free licences band. 

For this I have some questions.

Q1: Would the following be possible with one of those tranceivers? optimal environment, propagated approx 1m above  sealevel. to reach Line of sight range on 5 to 10km

- RF datarate 19,2kbps  

- 25khz channel spacing

If not which parameters must be changed

Q2: Is it possible to send completely transparent messages with of-course some start delay (preamble sync words etc). And then contentious transmitting lets say 300 to 400 byte?

Will such data amount require some kind of coding, manchester or other, re-sending preamble etc?

 

Q3: Been told that SI4468 is a competitor to Texas chips. Is there anyone with comparison knowledge between this two tranceivers?  

Br Leif Gunnar Ellingsen

  • 0
    TI__Guru**** 317180 points
    Q1: 19.2 kbps in a 25 kHz gives not a lot of margin for frequency tolerance using 2-FSK.

    For range: YOu can play with the excel sheet found here: e2e.ti.com/.../375556 With the datarate you outline and 1 m above ground 10 km will be a challenge.

    Note that the limitations is physics and will be the same for all chip sets.

    Q2: I would recommend that the data sent is fairly "white", in other words doesn't contain long sequences of just '1' or '0' but sending 300 byte packet is not an issue.

    Q3: This is a TI forum...
  • 0 in reply to TER
    Prodigy 80 points
    Hello TER,

    Thanks for the input. And yes this is a TI forum:) I only wanted to ask if anyone had some knowledge on this.

    Regarding the choose between CC1120 or CC1125. Is there any major difference when using high data rate (sensitivity is almost the same on 19,2kbps). Another positiv effect with the CC1120 compared to CC1125 is a slitly better current conumption which is important for us.

    Please en-light me on this one.

    Do TI have recommended front-end amp solutions for 434Mhz?

    Is there a kit or module with the CC1120 and CC1190. Or is the recommendation to implement the ref-design ?

    Br Leif G
  • 0 in reply to Leif Gunnar Ellingsen
    TI__Guru**** 317180 points
    For ~20 > kHz RX Bw it's no significant difference between CC1120 and CC1125.

    A CC1120 - CC1190 kit/module is not available

    We have limited work with frontends on 433 MHz, what we can done can be found under CC1310.