CC1101: RBIAS optimum value.

Abel Hermanus Uys

Part Number: CC1101

Tool/software:

what is the calculation for the resistor on RBIAS pin of the CC1101?

please provide more information than "the resistor value should always be 56kOhm". I would like a more scientific explenation for the dertermination of the resistor value:

over 1 year ago

0 ZC over 1 year ago

TI__Mastermind 18855 points

Hi,

The answer in the following thread is also applicable to the CC1101: https://e2e.ti.com/support/wireless-connectivity/zigbee-thread-group/zigbee-and-thread/f/zigbee-thread-forum/356281/why-the-rbias-pin-of-the-cc2530-should-be-connected-to-a-56k-resistor-why-i-am-crazy-help

The RBIAS on all of our CC devices is used by an internal current source to setup a reference for the all analog circuits inside the device. If you change the value that we recommend the chip might not work at all. You need to use a 1% resistor and the value we use on that location. Furthermore you need to make sure there are no noise sources close to it as it will negatively influence the entire chip performance.

I cannot give more details about the value selection as there is no need to calculate or change this value from the recommended 56 kOhm.

Regards,

Zack

Sub-1 GHz

Sub-1 GHz forum

CC1101: RBIAS optimum value.