Tool/software:
Hello,
I want to use CC1352 with both 915 & 433Mhz frequency. (Not at the same time - but support these 2 configurations)
I know that CC1352 can tune the sub-giga frequency, but there is a different recommended filter chain for every frequency.
My question is what is the recommended design for that use case? Or should I use a different IC that supports 2 sub-giga outputs?
Thanks in advanced
OK. Can you please share your recommended chain design for each frequency in single-ended mode?
This is the designs I know for the differential use:
915Mhz:
433Mhz:
Hi Ofer,
Our most up-to-date preliminary designs have been developed for a 0201 component size (see Section 2.4 of SWRA814 (SimpleLink CC131x and CC135x Family Hardware Migration Guide) https://www.ti.com/lit/swra814 for reasons this could result in performance differences).
The most time-efficient approach I would take is to use the preliminary designs below as a starting point. Although the 433 MHz BOM is stated as being for the CC1350, this should still be valid.
The 433 MHz BOM (ignore the 2.4 GHz path):
For 868/915 MHz, the BOM provided in Section 2.3.1 of SWRA640 (CC13xx/CC26xx Hardware Configuration and PCB Design Considerations): https://www.ti.com/lit/swra640:
To minimise risk, for the 868/915 MHz BOM I would add an additional series inductor after C2 (before the shunt capacitor C3) and mark it as 0R for now, just so you have more flexibility with the design. This means the basic topology is the same for both 433 MHz and 868/915 MHz (which also simplifies the layout).
This hasn't been forgotten about, but we cannot assign a large amount of resources to optimising a new BOM if it is not a large order size so I am seeing what can be done. As it is the Easter break here (national holiday), I will need to continue following this up next week.
Regards,
Zack
