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CC1260: Frequency Range and Divider on TX Output

MattLin
Intellectual 1050 points

Part Number: CC1260

Hi Team,

One of my customers had a question regarding the CC1260:

First off, we would like to know what frequency range the Frequency Synthesizer within the CC1260 is capable of contiguously tuning over.  The datasheet states the CC1260 supports Frequency Bands: 863 to 876 MHz and 902 to 930 MHz but there is no definitive information on the actual LO tuning range over operating temperature extremes.  Specifically, we would like to know if the CC1260 is capable of contiguously tuning from 820 to 940 MHz over the operating temp range of -40 to +85 degC.

The second question we have is whether the CC1260 offers any kind of divider on the Tx output.  Specifically we would like to understand if the CC1260 has any means to divide the Tx signal by 2.

Can you comment?

Thanks

  • 0
    TI__Guru**** 317180 points
    - The synth range stated in the datasheet is true over corners (production variation) and min/ max temperature. The chip only supports the range stated in the datasheet.
    - The TX part contains no dividers. Are you thinking about division in frequency?
  • 0 in reply to TER
    Prodigy 10 points

    Thanks for your reply.  We were reviewing the CC1260 User's Guide and it appears to state that the the CC1260 is capable of tuning over the 820 - 960 MHz range.  Specifically, I am referring to Table 47 in the CC1260 User's Guide.

    Table 47.  Frequency Band Configuration (FREQ_BAND) Register Field Descriptions

    Bit Name Reset Type Description
    7-4 FREQ_BAND_NOT_USED 0x00 R NOT USED
    3-0 FSD_BAND_SELECT 0x02 R/W

    Band Select Setting for LO Divider

    0010  820.0 - 960.0 MHz band (LO divider = 4)

    The information in Table 47 seems to indicate that the CC1260 VCO tuning range is actually 3280 to 3840 MHz due to the divide-by-4 setting.  Also the Frequency Band information in the User's Guide is very similar to that of the CC1125, which states that device can be controlled to operate over the 410-480 MHz range by setting the FSD_BAND_SELECT = 0x04 (which per the CC1125 data sheet is an LO divider = 8). So can one infer that the same divide-by-8 setting (FSD_BAND_SELECT = 0x04) is also valid for the CC1260 which would allow it to also tune over the same 410-480 MHz range?

  • 0 in reply to David Attard
    TI__Guru**** 317180 points
    CC1260 is a device we normally don't promote. The main reason is that practically speaking it's only possible to use together with a DSP using the parallel interface and we don't have a SDK with examples on how the data can be post processes. Are your customer able to implement the software required based on what is documented in the user guide?

    Why are they looking into CC1260?