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CC1312R: RX Bandwidth setting in CMD_PROP_RADIO_DIV_SETUP

Peter Jones97
Intellectual 335 points
Part Number: CC1312R


Hi,

just wanted to confirm.

In SmartRF Studio you can set the RX Filter BW parameter to, say, 622kHz for WB-DSSS at 915MHz. Looking into the CMD_PROP_RADIO_DIV_SETUP command the corresponding rxBW is set to 0x2C (44 dec). According to the document "CC13x2, CC26x2 SimpleLink™ Wireless MCU Technical Reference Manual" a setting of 44 corresponds to a receiver bandwidth of 621.6kHz for 868MHz but 655.3 for 915MHz (Table 25-183). 

Should the RX BW value in SmartRF Studio be interpreted as the setting for 868MHz always? So with 622kHz RX BW we will actually get 655.3kHz for the 915MHz-band?

Thanks!

/Peter

  • 0
    TI__Guru**** 317180 points
    Yes, SmartRF Studio just have one table for RX BWs for the two bands, meaning that when you enter a frequency in the 868 MHz band or the 915MHz band the RX BW value that is given is always calculated for 868 MHz. I have filed a ticket to at least give one table for 868 Mhz and one for 915 MHz to highlight that the RX BW is RF frequency dependent.